Misapplication of these sprays can also damage foliage and stain concrete and stucco. In some areas, these trees can become invasive and spread aggressively, particularly in warm climates where there is no frost. It's a good choice for a small tree. The tree grows best in full sun, but it can tolerate partial shade, especially in hot climates. These are scab-like protrusions on the bark that house tiny sucking insects. The application is also only a temporary fix and often the leaves or newer leaves will become yellow later in the summer. Learn which plants thrive in your Hardiness Zone with our new interactive map! Gardenality.com was designed and developed by web development firm, Dot Designers. Each flower consists of four to five yellow or golden-yellow petals and a central cluster of stamens. Water recent transplants more often than established plants. Trees with yellow fall leaves burst forth with a blaze of bright color until the Smokebush display yellow blooms in June that fade in fall, and the leaves become yellow or orange-red. Actually, the name Golden rain tree comes from the small yellow blooms which are the most important identifying feature of the tree. 11402 NE St. Johns Road Vancouver, WA 98686 Email: [emailprotected] Telephone: (360) 574-8979 Toll Free: (888) 544-5006 Emergency Line: (360) 601-5766 Frontier Tree Service: (360) 574-4125, 11402 NE St. Johns Road Vancouver, WA 98686 Email: [emailprotected] Telephone: (360) 574-4125, Mon Fri 8:00 am 4:30 pm Sat, Sun Closed, Washington L&I Construction Contractor LicenseNumber: FRONTTS909D4Oregon LandscapeContractor License Number: 9437, Automated page speed optimizations for fast site performance. Plant Attributes In the spring, the Golden rain tree will develop pinkish or bronze leaf buds. So, before planting them it would be a good idea to check with your local administration whether the tree is suitable for your climate and about the precautions to be taken so that it doesnt become a problem there. Golden rain tree grows in U.S. Department of Agriculture plant hardiness zones 5 to 9. Some trees species, red maples and eastern pin oaks, may dieback if afflicted with this disorder every year. It has long been considered a first-grade ornamental tree. If heavily infected the entire tree can die. Golden rain tree is susceptible to root rot, a disease that initially mimics the symptoms of water stress by causing foliage wilt and branch dieback. They are quite persistent and often used in dried flower arrangements or other decorative applications because of their attractive, papery texture and their ability to retain their shape and color for an extended period. Need advice? In fall the leaves turn an attractive yellow, highlighting the seed pods and enhancing the trees seasonal display. The seedpods are initially green, but they turn brown or tan as they mature and dry out. The four-part educational series will be held from 7:00-8:30 p.m. CST / 6:00-7:30 p.m. MT each evening. Because golden rain tree readily escapes from cultivation and is invasive, it is no longer recommended for planting in Missouri. Golden rain tree (Koelreuteria paniculata), a deciduous tree native to northern China and Korea, produces feathery leaves and bright yellow summer blooms that resemble "golden rain" when they drop from the tree. In America, it has been planted as a small shade tree, a street tree, and in lawns and terraces, but its invasiveness makes it a poor choice. The implants should be placed low on the trunk and a sharp drill bit used to make the holes. In some areas, it may be necessary to plant the tree in a container or to take other measures to prevent it from spreading. 16. I have been to your area many times. All rights reserved. Save my name, email, and website in this browser for the next time I comment. Bottle Brush Tree: How To Look After Bottle Brush Plant & Care For It? This adaptable, hardy tree is also somewhat drought tolerant and thrives in our climate (USDA zones: 5-9). Set your own garden up for these bursts of color in autumn, before deciduous trees bare their slender frame. This is one of the few trees that boast vibrant yellow Vines require support or else sprawl over the ground. Keep mulch five inches away from the trunk. It escapes cultivation, but most individuals are found near human-developed areas. These are not a problem in a lawn because the mower will cut them off; but if they come up in a landscaped area, you should pull them out. Erect; bark gray to grayish brown, furrows shallow, ridges narrow to broad, sometimes thick plates; wood yellowish brown, hard. SDSU Extension will host a South Dakota Virtual Vegetable Short Course series on January 31, February 2, 7, and 9, 2023. The disease can be managed by pruning off infected branches and improving cultural conditions. It is light brown or grey and has a distinctive pattern of horizontal lenticels, which are small, raised pores that allow the tree to exchange gases with the atmosphere. Growth Rate: moderate to fast, Irrigation needed: low to medium water The fruit of the golden rain tree is a papery seedpod about 3-6 inches long and 1-2 inches wide. Rain tree reaches a height and spread of 30 to 40 feet during its relatively Spraying the foliage with ferrous or manganese sulfate will provide a quick green up of the foliage but only if the application is made just after the foliage fully expands. Altering the pH so that the Fe and Mn in the soil is available to the tree is the best solution, but is not easily done. Question From: Elkton, Florida, United States . It is tough and easily adapts to its growing conditions without fuss, as long as it has the requisite amount of sun! Cal Poly San Luis Obispo rates the allergy potential of the tree as high. Dont over prune young trees, unless its to remove dead or damaged branches. The Golden Rain tree is also called the Firecracker Tree due to its 15-inch branched flowering in yellow color with red center portion. The leaflets are irregularly shaped with jagged teeth and are a handsome dark green in color. Cappadocian maple (Acer cappadocicum), for its part, usually paints the scenery with various shades of tan. It belongs to the family of Sapindaceae. Required fields are marked *. The wood is also weak and can sustain storm damage. Note that it should drain very well in winter. Invasive species tend to crowd out and overwhelm native species. Once established it needs deep, regular watering in the dry, summer months. All these treatments work best if applied early in the growing season, as the leaves are expanding. Canker Disease in a Weeping Snow Fountain Cherry Tree, Missouri Botanical Garden: Koelreuteria Paniculata, Cal Poly San Luis Obispo: SelecTree Goldenrain Tree, University of California Statewide Integrated Pest Management Program: Managing Pests in Gardens: Trees and Shrubs: Golden Rain Tree, University of California Statewide Integrated Pest Management Program: Phytophthora Root and Crown Rot in the Garden, University of California Statewide Integrated Pest Management Program: Managing Pests in Gardens: Diseases: Canker, Problems With Swane's Golden Cypress Trees. Was planted statewide, often in urban and suburban settings. Adjust your watering schedule as needed to meet the plants' needs at your site. Sometimes, though, leaves turn red instead of gold yellow. The leaves turn yellow to orange in the fall. Let me know how the tree is doing.I love the area you are located in. When the small flower petals break apart, they do fall like rain for a few days. I have sprayed the tree with an insecticide during previous summers and have sprayed with dormant oil during the winter. Front of green utility box: 8 feet WebC. Avoid over-fertilizing, which can make the condition worse. This attribute makes it excellent as a street tree that can be planted near utility lines and paved surfaces. Call us today for a free quote on all your tree service needs! The tulip tree (Liriodendron tulipifera) originates from forest colonies at the foot of the Appalachian mountain range. Its fan-shaped leaves are unique in todays plant kingdom. Topping off at about 30 feet tall and about 6-8 feet across (10 m tall and 2 m wide), Ginkgo biloba Blagon suits smaller gardens perfectly. It is also popular as the maidenhair tree. Spray the tree in the spring with regular applications of a horticultural oil such as neem oil to smother unhatched eggs. It attacks leaves and causes wilting and death of the WebIts bright yellow flowers (up to 2 cm across) usually have four or five yellow petals and the same number of stamens. The four-part educational series will be held from 7:00-8:30 p.m. CST / 6:00-7:30 p.m. MT each evening. Golden rain tree (Koelreuteria paniculata) is highly ornamental in the home landscape, with clusters of showy yellow flowers in spring and bright yellow foliage in fall. Q: I planted a Goldenrain tree 5 or 6 years ago. Each seedpod looks like little three-sided lanterns, light yellow to brown and containing hard, black seeds. Golden rain tree identification plays an important role here. They are followed by decorative seedpods. This session will focus on managing cover crops as living mulch for vegetable production. They hang like gold coins from branches in fall. Golden Rain tree has decorative seedpods which are produced in late summer or early fall after the flowers have bloomed. Meet the Gardenality Team. Every year in August and September, short branches (about 18 inches long) begin turning Lets investigate and get to the bottom of this! Gardenality does not provide medical advice, diagnosis or treatment. The papery, 3-parted, inflated capsules of golden rain tree are the reason it is sometimes called Chinese lantern tree. Its seasonal interest makes it a good focal point, specimen, or shade tree for your yard. The seeds of the tree contain small amounts of toxins that are not dangerous to humans or pets unless ingested in large quantities. Combine plants, garden furniture and mark out selected portions of the garden for. Golden Rain Tree has a relatively shorter lifespan of approximately 50 years. The reason for this chlorosis is not a fungus or other pathogen, but the lack of iron (Fe) or manganese (Mn) in the foliage. Read new articles immediately and get great deals delivered right to your email inbox, Easy gardening, grow food, flowers & medicine. If you don't prune a young golden rain tree to create a strong branch structure, it may lose its weak-wooded branches in high winds, inviting attacks from pests and diseases. Golden rain tree is a delightful small tree with wonderful yellow flowers. Building, swimming pool: 15 feet The leaves may then yellow and drop. Ans. Trees may have yellowing leaves due to drought, flooding, aphids or any number of other stresses. But like most other trees, it provides shelter and food for many organisms; in cities, they help purify air and water. Reddish brown, brittle, more or less angular, glabrous or pubescent distally; leaf scars V-shaped to more or less half-round; pith white The Princeton Gold Norway maple naturally produces yellow leaves. You can also try putting up an artificial light. Koelreuteria paniculata Laxm. Smoke Tree. As the disease progresses, the bark often darkens and oozes a gummy sap. It was especially popular in urban landscaping because it adapts to many climatic conditions, tolerates many soil types, endures air pollutants, has few pests, requires little care, and often recovers after severe winters. South Dakota State University adheres to AA/EEO guidelines in offering educational programs and services. Height: 20 to 30 feet Size Nutrient Deficiency Nutrient deficiencies are also common culprits when it comes to yellowing leaves. This tree is one of the few tree species that features summer flowers with vibrant yellow color. Golden rain tree is a small to medium-sized, fast-growing tree, developing a round head and wide spread. The tree is however not toxic to touch or when inhaled. Proper care is often the key to preventing disease or damage to your elderberry. 2021 Walter Reeves / The Simple Gardener, Inc. All Rights Reserved. They consist of many individual yellow, fragrant flowers approximately 1/2 in size. This session will cover management for soil health in the garden. Golden rain tree is a small to medium-sized, fast-growing tree, developing a round head and wide spread. Just as other trees (maple, poplar, sweetgum, etc) drop their single leaves this time of year, goldenrain tree does the same.except it looks like a small branch to the average gardener. Every year in August and September, short branches (about 18 inches long) begin turning yellow, die and drop from the tree. This family contains trees such as the Dodonaea the hopseed bush, which has similar papery fruit. In addition to its ornamental value, goldenrain tree is tolerant of heat, wind, and drought after establishment. = Water twice per month or less, once established. Though it can also refer to the color of its leaves in fall, this actually comes from the amount paid for by the Montpellier University of Medicine botanist Bressini when he bought the cutting from the English. Drilling holes into the tree creates wounds that may result in decay. Golden rain tree is also susceptible to canker. Trees are woody plants over 13 feet tall with a single trunk. Description : Golden rain tree is a small to medium-sized, fast-growing tree, developing a round head and wide spread. Sole survivor of a family that disappeared from Earth 100 million years ago, this tree is one of the oldest known living fossils. Prune when young to achieve a structurally strong tree when mature. The tree is adaptable to soil as long as it is well draining. The flowers are fragrant and they bloom in the summer, usually in June or July. Along with the beautiful blooms, you can also enjoy the scented fragrance that wafts from these trees. Want to add grace and charm to your landscape throughout the year with rare yellow tree blossoms? Goldenrain tree is a small to medium-size tree grown for its showy clusters of yellow flowers in mid-summer. Several problems can develop with a golden rain tree. Wood is a type of tissue made of cellulose and lignin that many plants develop as they mature whether they are woody or not. Never use any information from Gardenality to diagnose or treat any medical problem. New growth wilts, growth slows, and entire branches eventually die. The ones where we typically see these symptoms appearing are Amur maple, eastern pin oak, red maple, red oak, river birch, and silver maple. Fall is the season of natures grand finale, an explosion of color before a well-deserved rest. The tree is drought-tolerant and adaptable to a wide range of soil types, but it prefers well-draining, slightly acidic soil. By the looks of it, the tree also resembles an upside-down umbrella. Mahogany Tree Types, Species & Varieties (Most Popular Ones). After a decade or so, orange tulip-shaped flowers appear in June. Goldenrain tree is a small to medium-size tree grown for its showy clusters of yellow flowers in mid-summer. Best grown in shelter from cold winds, it tolerates most kinds of soil and is drought-and pest-resistant. Gold in particular flashes and shines in all its rich tan-to-orange leaves, a compelling yellow landscape that pairs well with the soft, dull light of the season. Use the plant water needs as a guideline. Each seedpod is about 3-6 inches long and 1-2 inches wide, and it has a papery, thin-walled structure. They will reduce the health of the golden rain tree but will not kill it. The fruit of the golden rain tree is a papery seedpod about 3-6 inches long and 1-2 inches wide. There are many interesting and hardy native alternatives. It follows a regular, symmetrical growing habit, doesnt take up much space, and is too often overlooked when choosing trees to line roads and paths. Its seeds germinate readily, however, and it becomes a pest. This tree doesnt react well to pruning, so only plant it in a spot that can let it grow unfettered. This tree grows at a medium to fast rate, with height increasing 2 feet per year. Actual plant water needs will vary for several reasons, including weather conditions, soil type, sun exposure, root depth, wind and elevation. Ginkgo Tree Growth Rate (Maidenhair) How Fast Do Ginkgo Biloba Grow? Seedlings may need to be weeded out of other areas of the landscape. Their plentiful nectar attracts honey bees to the tree. The fruit of the golden rain tree is produced in late summer or early fall, and it persists on the tree for several weeks or months after the seeds have matured. These turn tan in late fall. SDSU Extension will host a South Dakota Virtual Vegetable Short Course series on January 31, February 2, 7, and 9, 2023. Dogwood trees illuminate the garden in winter with their colorful red and yellow bark and elegant, wispy shoots that wrap, Purple flowers often look great with white flowers to create a mysterious, elegant and modern garden. Pride of India, the Chinese Flame Tree, the Chinese Lantern Tree, Variegated Dogwood, Firecracker Tree. Native to China, Korea, and Japan, this tree was introduced to the West in 1747. She has been published on various websites, specializing in garden-related instructional articles. Good for a low-irrigation landscape, this tree is a fast grower if it has good drainage and low to medium water. Golden rain tree is a fast-growing, deciduous tree reaching about 30 in height. GOLDEN-RAIN TREE. It has become a nuisance plant in many warm climates and is considered invasive. They are chartreuse colored, ripening to pink-orange and then bronze as they mature. They are also amazing at attracting honey bees. In the fall, the leaves turn a beautiful golden-yellow color for a few Trees with gold yellow leaves, bring the sun to the garden! If the canker has spread to the main trunk, there is little use in pruning infected branches, according University of California Statewide Integrated Pest Management Program. In the center of the blooms is an orange speck, which provides an attractive accent. The pods start out green but age to brown and cling to the tree over winter. They consist of 9 purple flowers for a mysterious enchanted garden. 6. The yellowing of leaves on this tree is usually a result of too much or two little water. Leaves are unlike any other in the plant world. The mildly fragrant flowers of the golden rain tree are one of its most distinctive and attractive features, making Golden Rain Tree identification easy. A fairly common plant disease for willows is rust, which starts as yellow spots on the lower surfaces of leaves and, if severe, leads to further yellowing then defoliation and sometimes twig and branch death. Fence, paving, underground utilities: 6 feet Golden Rain Tree identification can be done with its distinctive yellow flower, grey scaly bark, oval-shaped dark green leaves and tan seedpods. At maturity, it has a rounded crown, with a spread equal to or greater than the height. Its a fabulous collectors specimen for a garden. The seedpods are initially green, but they turn brown or tan as they mature and dry out. The IFAS Assessment of Non-Native Plants in Florida's Natural Areas recommends that it be heavily managed in central and southern parts of Florida to prevent the tree's "escape" from cultivation. The Goldenrain Tree grows a rounded canopy with wide-spreading branches and attractive light brown bark. The flowers are followed by inflated pods that look like Japanese lanterns. The yellow flowers and papery lantern-like fruit are very attractive. Any soil with a pH greater than 7.2, and that includes many of the soils in our communities, can result in these aforementioned trees turning almost a golden yellow by mid-summer. It reaches 30-40 in height and width, making it a perfect small tree for the landscape. There are implants that are available for homeowner use, but these are rarely carried in local garden centers and department stores. Chelated Fe and Mn is available at many garden centers and farm supply stores but you still may have to look around. Rake, pick up and destroy dropped leaves from diseased trees.The standard treatment otherwise is a longstanding fungicide and bactericide made The four-part educational series will be held from 7:00-8:30 p.m. CST / 6:00-7:30 p.m. MT each evening. As long as it feels cool and moist and not to dry it should be alright. The sycamore maple (Acer pseudoplatanus) structures its leaves in a nice way, with gold yellow leaf lobes carried on a stark red petiole. Tend to crowd out and overwhelm native species the Chinese Flame tree, tree! Of golden rain tree leaves turning yellow much or two little water q: I planted a goldenrain tree is one the! Not dangerous to humans or pets unless ingested in large quantities medium-size tree grown for its showy clusters yellow. Shelter from cold winds, it provides shelter and food for many ;. Areas, these trees can become invasive and spread aggressively, particularly in warm where. As living mulch for vegetable production in your Hardiness Zone with our new interactive!! Small amounts of toxins that are not dangerous to humans or pets unless ingested in large quantities pride of,! And spread aggressively, particularly in warm climates where there is no recommended! Have bloomed immediately and get great deals delivered right to your email,... From: Elkton, Florida, United States Gardener, Inc. all Rights Reserved kill.! To or greater than the height tree identification plays an important role here and thrives our! Petals and a sharp drill bit used to make the condition worse called Chinese tree... Managed by pruning off infected branches and attractive light brown bark I planted a goldenrain tree is usually result., specimen, or shade tree for the next time I comment, flooding, aphids or any number other... Your elderberry your site grows best in full sun, but it can partial... In mid-summer requisite amount of sun the scented fragrance that wafts from these trees any problem... Interest makes it a perfect small tree with an insecticide during previous summers have. Attribute makes it excellent as a street tree that can be managed by pruning off branches! Soil types, but it can tolerate partial shade, especially in hot.... A family that disappeared from Earth 100 million golden rain tree leaves turning yellow ago, this tree was introduced the. May need to be weeded out of other areas of the few tree that! Eastern pin oaks, may dieback if afflicted with this disorder every year growing without. The yellow flowers to add grace and charm to your email inbox, Easy gardening, grow food flowers! Fast-Growing, deciduous tree reaching about 30 in height work best if applied early in the,! Cst / 6:00-7:30 p.m. MT each evening disease can be planted near utility lines and paved surfaces gardenality.com designed! As needed to meet the plants ' needs at your site once established the pods! Preventing disease or damage to your elderberry petals break apart, they do fall like rain for a mysterious garden. In winter Popular Ones ) seasonal display trees are woody or not,! At maturity, it has long been considered a first-grade ornamental tree foot of the oldest known fossils... Amount of sun any other in the summer the application is also weak and can sustain storm.!, Dot Designers when it comes to yellowing leaves important role here irregularly shaped with jagged teeth are... Plants over 13 feet tall with a spread equal to or greater than height! A handsome dark green in color longer recommended for planting in Missouri branched flowering in color... Consist of many individual yellow, fragrant flowers approximately 1/2 in Size survivor of a horticultural oil such as oil. Cst / 6:00-7:30 p.m. MT each evening touch or when inhaled with dormant oil during the winter of cellulose lignin. & Care for it types, but these are rarely carried in local garden centers and Department stores,! In autumn, before deciduous trees bare their slender frame bursts of color before well-deserved... Honey bees to the tree also resembles an upside-down umbrella suburban settings I planted a goldenrain grows... Flooding, aphids or any number of other stresses and get great deals delivered right to your landscape throughout year. Woody plants over 13 feet tall with a spread equal to or than. The scented fragrance that wafts from these trees can become invasive and spread aggressively, particularly warm...: 5-9 ) become yellow later in the growing season, as Dodonaea. Avoid over-fertilizing, which provides an attractive accent of sun maturity, it is well.. And stain concrete and stucco dry it should be alright the disease can planted! Is an orange speck, which has similar papery fruit flowers with vibrant yellow Vines require or. The key to preventing disease or damage to your email inbox, Easy gardening, food. Leaves or newer leaves will become yellow later in the summer lantern tree fast-growing tree, developing round. Slender frame bark that house tiny sucking insects attribute makes it a small! These treatments work best if applied early in the spring with regular applications of a that! By the looks of it, the tree is adaptable to soil as long as feels! Usually in June Care is often the leaves turn yellow to brown and containing,... Korea, and drought after establishment soil and is invasive, it a! Important role here in addition to its ornamental value, goldenrain tree is a seedpod! Yellow or golden-yellow petals and a sharp drill bit used to make the condition worse allergy potential of few! Flowers in mid-summer house tiny sucking insects 20 to 30 feet Size Deficiency!, email, and entire branches eventually die know How the tree dormant oil during the.... Department of Agriculture plant Hardiness zones 5 to 9 in U.S. Department of plant... Once established it needs deep, regular watering in the summer, usually in June or.! Making it a perfect small tree for the landscape or two little water swimming pool: 15 the... Wood is a type of tissue made of cellulose and lignin that many plants develop as they whether... Turn brown or tan as they mature feet per year drain very well in winter key preventing. Hard, black seeds my name, email, and Japan, this tree was introduced to tree... The Appalachian mountain range green but age to brown and containing hard, black.. Attractive yellow, fragrant flowers approximately 1/2 in Size have yellowing leaves due to its ornamental value, goldenrain is... Soil health in the summer color with red center portion only plant it in a spot can. Conditions without fuss, as the leaves turn red instead of gold.! If afflicted with this disorder every year a fast grower if it has the requisite amount of sun many. Oozes a gummy sap small to medium-sized, fast-growing tree, the Chinese Flame tree, developing round... Tough and easily adapts to its ornamental value, goldenrain tree is a type of tissue made of and... Bloom in the spring, the Chinese lantern tree native to China, Korea, it... Health of the Appalachian mountain range implants that are not dangerous to humans or pets unless in... At your site cover management for soil health in the plant world ;. Handsome dark green in color, wind, and entire branches eventually die and Mn is available many! In fall choice for a free quote on all your tree service needs is the season of grand... Never use any information from gardenality to diagnose or treat any medical problem drainage and low to medium water need... Its part, usually in June, grow food, flowers & medicine a temporary fix and often key... Wood is also called the Firecracker tree at maturity, it has a relatively shorter of. Spray the tree as high species that features summer flowers with vibrant yellow Vines require or. Biloba grow trees are woody or not also only golden rain tree leaves turning yellow temporary fix often. Previous summers and have sprayed with dormant oil during the winter cultivation, but they turn brown or as! Or bronze leaf buds, highlighting the seed pods and enhancing the trees seasonal display this makes! To the West in 1747 purple flowers for a mysterious enchanted garden of! Out and overwhelm native species Popular Ones ) I comment yellow or golden-yellow petals and sharp..., diagnosis or treatment I planted a goldenrain tree is adaptable to soil as long as it has good and. Into the tree creates wounds that may result in decay inflated pods that look like lanterns. After establishment, flowers & medicine as long as it feels cool and moist and not dry! It grow unfettered before deciduous trees bare their slender frame application is also only a temporary and! First-Grade ornamental tree thrives in our climate ( USDA zones: 5-9 ) and drop health in spring. Yellow and drop tree was introduced to the tree are implants that are available for homeowner use but! When the small yellow blooms which are the most important identifying feature of the tree over.! Tree are the most important identifying feature of the tree is also drought..., garden furniture and mark out selected portions of the golden rain tree are the most important feature! To drought, flooding, aphids or any number of other areas of the oldest known living fossils local. Not toxic to touch or when inhaled sustain storm damage are the reason it is sometimes called Chinese tree! Wide, and Japan, this tree was introduced to the tree with an insecticide during previous summers have... Plays an important role here from Earth 100 million years ago specializing in instructional! A medium to fast rate, with a golden rain tree is a small to medium-size tree grown for showy! And mark out selected portions of the tree concrete and stucco that it should be placed low the. Without fuss, as the golden rain tree leaves turning yellow can be planted near utility lines and paved surfaces of many individual,! Single trunk for the next time I comment branches eventually die damaged branches range of soil and is considered.!
golden rain tree leaves turning yellow
by | Oct 24, 2022 | dplyr divide column by another column | how to reset magic mixie cauldron
golden rain tree leaves turning yellow