Border forsythia
Forsythia × intermedia
Also called border forsythia, forsythia.
Vigorous arching shrub whose bare stems turn bright yellow in early spring. Fast screen for banks and property edges.
Size over time
Typical landscape size 2.4–3 m (8–10 ft) tall and 2.4–3.6 m (8–12 ft) wide; fast growth, about 4 years to maturity. Intermediate sizes use the planner’s growth curve (k = 0.45) from the #3 install size.
Bloom
Yellow flowers, Mar–Apr (northern-hemisphere months; timing shifts with region and season).
| Plant | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Border forsythia : Mar–Apr |
Design notes
- Avoid shearing into boxes — remove the oldest canes at the base after bloom.
- Flower buds can be killed in zone 4–5 winters; hardier cultivars exist.
Regions
Native range: Garden hybrid of Chinese species.
Not recorded as native to any of the three pilot regions.
Native status describes where the species occurs naturally. It is not a promise that it suits a particular garden; site conditions decide that.
Related plants
Plan with Border forsythia
Place it in a design, check it against your zone, light and moisture, and see it at year three and year ten.