Greenstem forsythia (Forsythia viridissima) is a deciduous shrub that is indigenous to Asia. Sometimes called Korean greenstem forsythia, this fast-growing, densely flowering plant is often used as a ground cover to protect soil health and prevent weeds. It can also be planted indoors in containers. A popular variety of this species, called 'bronxensis,' was first cultivated at the Bronx Botanical Garden in 1939, using Japanese seeds.
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Perennial
Lifespan
60 cm to 90 cm
Spread
Green, Yellow
Leaf Color
2.5 cm to 5 cm
Flower Size
Green
Fruit Color
Yellow, Gold
Flower Color
Green, Yellow
Stem Color
Winter dormancy
Dormancy
Deciduous
Leaf type
5 - 35 ℃
Ideal Temperature
Spring
Growth Season
On This Page
Images
Distribution
Culture
Quickly Identify
Care Guide
FAQs
Common Diseases
Images of Greenstem forsythia
Distribution of Greenstem forsythia
Distribution Map
Greenstem forsythia is native to southern China and South Korea, where it grows in ravines and along streams and river valleys. It has been introduced in Japan and sporadically in the central and eastern US. It is often planted in the US as an ornamental plant or ground cover.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Ravines, margin of woods near river valleys and streamsides
Hemisphere Trend Curve
Northern
Sorthern
Culture
Garden Use
Greenstem forsythia shines brightly with small yellow flowers on long stalks in early spring, valued for the way it brings early-season color amongst the other dormant plantings. Its hardiness makes it is equally at home as a basic ground cover as it is in a rock garden or pruned into a colorful hedgerow. Companion plants include Privet and Blue Spruce.
Symbolism
Anticipation, Innocence
Interesting Facts
The greenstem forsythia is valued for its immunity to black walnut toxicity. This is a phenomenon wherein the black walnut tree's roots produce a toxic compound called juglone that can prevent other species from growing. Greenstem forsythia is immune to this effect and thus can be planted nearby to black walnut trees in parks and arboretums.
Name Story
Greenstem forsythia: Forsythias are popular early spring flowering shrubs planted in gardens and parks especially during Eastertide. The stem of the plant is evergreen, so it is called greenstem forsythia.
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Quickly Identify Greenstem forsythia
1
Vibrant yellow flowers bloom before foliage, with four lobed petals uniquely joined at base.
2
Distinctive dry capsules with rough texture and winged seeds for wind dispersal.
3
Opposite, simple leaves with toothed edges, pinnate veins, and purple tinge in fall.
4
Square stems with pronounced lenticels, transitioning from green to brown, aiding gas exchange.
5
Robust trunk with rough-textured bark, grey-brown hue, fissured surface for tactile identification.
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Water:
Originating from East Asia, greenstem forsythia prefers moderately moist soil and requires watering every 1-2 weeks. It flourishes outdoors during the growing season, with water needs being particularly vital for vibrant flowering.
Fertilize:
For greenstem forsythia, apply balanced nutrition fertilizers biannually in spring and mid-summer, using a 1-inch layer of compost or slow-release granules to promote growth. Adjust amounts during dormancy, avoid base contact to prevent burn, ensuring vibrant blooms and robust foliage.
Pruning:
Greenstem forsythia showcases vibrant yellow flowers and robust growth. Prune after late spring blooms to shape and promote flowering, focusing on dead or damaged branches. Avoid heavy pruning to prevent diminished flowering. Regular pruning improves air circulation, fostering healthier plants and reducing disease risks.
Propagation:
Greenstem forsythia propagates best via cuttings from healthy, non-flowering stems. Treat the cut end with rooting hormone and plant in a well-draining soil mix. Keep the soil moist until roots form, enabling efficient production of new plants that maintain parent characteristics.
Repotting:
To ensure lush growth for greenstem forsythia, repot every 2-3 years in early spring, using a pot one size larger. After repotting, provide indirect sunlight and consistent moisture for recovery, promoting vibrant yellow flowers. Proper care enhances greenstem forsythia's spring display.
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