Forsythia
Forsythia intermedia · Oleaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around forsythia and prepare for winter.
ID card
- Foliage
- Deciduous
- Flowering
- February to April (bright yellow flowers)
- Adult size
- 2.5 m in height, 1.5 to 2 m in width
- Growth
- Fast
- Hardiness
- Very hardy (down to -15 °C)
- Origin
- Horticultural hybrid of Korean and Japanese origin
- Soil type
- Ordinary, well-drained
- Family
- Oleaceae
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Prune immediately after flowering (April): remove the branches that flowered and cut back by half to densify. Without regular pruning, it becomes sparse and bare at the base after a few years.
The common mistake
Waiting until autumn to prune wastes a year of flower bud production, which forms in summer-autumn on the young wood of the season.
The pro's trick
Rejuvenate an old Forsythia by taking the most beautiful basal branches in April just after flowering; plant directly in moist soil: rooting is quick and reliable.
Care
Light exposure
Forsythia thrives in full sun to deliver generous and spectacular blooming. It tolerates partial shade but will flower less abundantly. Plant it in an open location, away from the shadow of large trees to ensure at least 6 hours of direct daily sunlight.
Watering
Water regularly during the first year after planting to promote root establishment. Once established, forsythia resists drought well and only needs watering during prolonged dry periods. Avoid excess moisture which can cause root rot.
Pruning and structure
Prune after flowering (April-May) by removing dead or crossing branches to open up the structure. Cut back the stems that flowered by about one-third to maintain a balanced shape and encourage branching. Avoid winter pruning which would compromise the following year's blooming.
Soil and planting
Forsythia adapts to any ordinary soil as long as it's well-drained. Plant it in autumn or early spring in a generous planting hole. Adding organic matter (compost) at the base facilitates establishment, but the plant is not demanding.
Nutrition and fertilizer
Forsythia is not a heavy feeder. An annual application of compost or balanced fertilizer in spring is more than enough. In poor soil, a flowering shrub fertilizer at the start of the growing season can support blooming.
Diseases and pests
Forsythia is very resistant. Rarely affected by serious diseases, it can occasionally suffer from powdery mildew in overly humid conditions. Good air circulation and airy pruning prevent most problems. Check for anthracnose if there's prolonged water stress.
Did you know?
Forsythia is one of the first flowers to bloom in spring in Europe, often as early as February, making it a symbol of hope after winter. Its name honors Scottish botanist William Forsyth (1737-1804), director of the Kensington Palace Gardens. In Asia, where it originates, it symbolizes beauty and resilience through the seasons.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.