WSU Clark County Extension
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Border Forsythia

Scientific name: Forsythia intermedia
Taxonomy
Family:Oleaceae
Type:Deciduous shrubs
Native:NO
Plant Requirements
Zone:5 to 8
Sun:Full sun
Plant Characteristics
Height:10 ft
Width:12 ft
Bloom:Spring flowers
Bloom Time:March to April
Bloom Color:Yellow
Additional Characteristics
Trees


Fruit

Leaves


Bark
Wildlife value

Poisonous
Description Border Forsythia is a true herald of spring with its yellow bloom emerging in late March-early April before the leaves develop.

  Morphology:
This deciduous shrub grows vigorously to an eventual height of 8'-10' with a spread of 10'-12' in an upright and arching fashion. The limbs bear 3”-5” long leaves, arranged in an opposite fashion. Leaves are lanceolate in shape and have toothed margins on their upper halves. Leaves are dark green above and pale below.

The bloom is the most notable feature of Border Forsythia. Flowers are 1.5” long and are borne in cluster of 2-6. It is not uncommon to find the bloom persists for as long as 3 weeks in the spring, especially if the weather stays cool and moist.

The twigs of Forsythia are square in cross section when young. All twigs have grey lenticels.

  Adaptation:
Forsythia is easily grown in average well-drained soils. In order to ensure the best flower production, be sure to give the plant a sunny location. Forsythia is often planted in multiples to form a hedge. Plants can be shaped as needed.

  Pests:
None reported.
For assistance, contact Dr. Charles Brun (brunc@wsu.edu), (360) 397-6060 5701
Computing and Web Resources, PO Box 6234, Washington State University, Pullman WA 99164-6234