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Genus Forsythia

Forsythia 'Courtasol' Photo/Illustration: Courtesy of McKay Nursery

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Forsythia are widely recognized for their utility in a shrub border, a bank, or for hedging, and for their light to deep yellow, four-petaled flowers. Choice cultivars are suitable for specimen planting or rock garden placement. The branches are great for arrangements and are easy to force in late winter.
Noteworthy characteristics: Forsythia's blaze of yellow flowers is surely one of the first harbingers of spring.
Care: Grow in moderately fertile, moist but well-drained soil in full sun or light shade. Prune after flowering—one option is to remove the oldest stems and selectively shape.
Propagation: Take greenwood cuttings in late spring or early summer; take semi-ripe cuttings in late summer.
Problems: Arabis mosaic virus, stem gall, dieback, root knot nematode, leaf spot.

Species, varieties and cultivars for genus Forsythia

Forsythia ‘Courtasol’
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Hardiness Zones:

Like other cultivars of this genus, 'Courtasol' is as tough as nails. The biggest difference from the rest, however, lies in its form. The stems reach to only 18 inches tall before arching down to the ground and running along to yield a 5-foot-wide spread. Its grapefruit yellow flowers appear in early spring.

Forsythia × intermedia 'Kolgold'
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Hardiness Zones:

Striking, extra-large yellow blooms cover each stem from base to tip in early spring.

Forsythia spp. and cvs.
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Hardiness Zones:

Its blaze of yellow flowers is surely one of the first harbingers of spring. Forsythia are widely recognized for their utility in a shrub border, a bank, or for hedging, and their light to deep yellow, four-petaled flowers.