Underplant forsythias with these flowers that bloom at the same time:
- 'Wanda' primrose (Primula 'Wanda'), zone 3
- Snow crocus hybrids (Crocus chrysanthus hybrids), zone 3
- 'Blue lady' Hellebore (Helleborus x hybridus 'Blue lady'), zone 4
‘Fiesta’ (Forsythia x intermedia ‘Fiesta’)
Height x width: 1.5 x 2 m
Compact and densely branched growth habit; golden yellow flowers; rich green leaves with variegated cream-and-gold centres; young stems have a reddish hue. Retains variegation well; bred in New Zealand.
Gold Tide (F. x i. ‘Courtasol’)
Height x width: 50 cm x 1 m
Spreading, dwarf growth habit; covered in lemon-yellow flowers; moss-green foliage. Useful as a groundcover; intolerant of dry soils; bred in Europe.
'Lynwood' (F. x i. ‘Lynwood’ syn. ‘Lynwood Gold’)
Height x width: 2 x 2 m
Upright growth habit; brilliant yellow flowers are evenly distributed along the length of the stems; medium green foliage. A branch sport (natural mutation) of F. x i. ‘Spectabilis’, it was discovered in Northern Ireland in the early 1930s.
Showy border (F. x i. ‘Spectabilis’)
Height x width: 2.5 x 2.5 m
Vigorous, upright growth habit; bright yellow flowers up to 3.5 cm across; medium green foliage. The standard and most widely planted cultivar; bred by Späth Nurseries of Germany; introduced in 1906.
‘Meadowlark’ (F. ovata ‘Meadowlark’)
Height x width: 2.5 x 2 m
Semi-arching growth habit; profusion of bright yellow flowers; dark green foliage. The most flower bud hardy variety (to –37°C); it was introduced by North and South Dakota state universities and the Arnold Arboretum.
‘Northern Gold’ (F. o. ‘Northern Gold’)
Height x width: 2 x 1.5 m
Upright growth habit; large, golden yellow flowers; dark green foliage; grey bark with yellow streaks. Flower bud hardy to –34°C; introduced by Agriculture Canada.
'Ottawa' (F. o. ‘Ottawa’)
Height x width: 1.5 x 1.5 m
Compact, tidy growth habit; vigorous, with masses of grapefruit-yellow flowers; dark green foliage. Flower bud hardy to –32°C; blooms 10 to 14 days earlier than other forsythias; raised at the Dominion Arboretum, Ottawa.