Forsythia x intermedia ‘Lynwood Gold’ (syn. ‘Lynwood’, ‘Lynwood Variety’) – This RHS Award of Garden Merit winner features larger bright yellow blooms borne on bare stems, usually starting late March to early April. It has a dense, spreading growth habit and makes a nice informal hedge. First introduced back in 1935. Grows 6-8′ high by 7-9′ wide. Hardy to zone 5.
Forsythia x intermedia ‘Beatrix Farrand’ – This cultivar was developed at the Arnold Arboretum and involves several crosses with ‘Arnold Giant’, Forsythia ovata and Forsythia x intermedia ‘Spectabilis’. It is quite floriferous with large golden-yellow blooms (up to 2″ long) that cover the bare stems. Thin and shape after flowering. Grows 6 to 8′ high and wide. Hardy to zone 5.
Forsythia ‘Fiesta’ – A compact cultivar suitable for smaller urban yards with deep yellow blooms starting in March. It also features variegated foliage of dark green leaves with cream to gold highlights in the center – which extends the visual interest beyond the flowering season. Best grown in part to full sun with adequate soil drainage. Grows 2-3′ high by 3-4′ wide. Zone 5.
Forsythia x intermedia SHOW OFF (syn. ‘Mindor’) – A virtual blast of yellow with flowers extending from the very base of the plant right up to the tips. This mid-sized deciduous shrub is a Proven Winners selection and makes a manageable blooming hedge. The flower stems are also excellent early season cuts for the vase. Grows 5 to 6′ high and wide. Hardy to zone 4.
Forsythia viridissima ‘Bronxensis’ – A very compact Forsythia grown from seed at the Bronx Botanical Garden back in 1939. It features primrose-yellow flowers on bare stems from March to April and dark green serrated foliage. This cultivar is also useful as a tall groundcover when mass planted. Best in part to full sun. Grows 1-2′ high by 2-3′ wide. Hardy to zone 6.