Genus: Forsythia

Forsythia

Photo/Illustration: 
Courtesy of McKay Nursery
(Forsythia)
for-SITH-ee-ah
Oleaceae
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.

Species, varieties and clutivars for genus Forsythia

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Forsythia
Forsythia spp. and cvs.
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Forsythia
Forsythia  × intermedia 'Kolgold'
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Forsythia
Forsythia ‘Courtasol’
Problems: 

Arabis mosaic virus, stem gall, dieback, root knot nematode, leaf spot.