Forsythia × intermedia
| Forsythia intermedia subsp. var. | Border forsythia | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Forsythia × intermedia (Border Forsythia)[1]is an ornamental deciduous shrub of garden origin.
The shrub has an upright habit with arching branches and grows to 3 to 4 metres high.[2] The opposite leaves turn yellowish or occasionally purplish in the autumn before falling.[3] The usually pale-yellow flowers are produced on one- to two-year-old growth and may be solitary or in racemes from 2 to 6.[2]
The hybrid is thought to be a cross between Forsythia viridissima and F. suspensa var.fortunei.[4]
| Standard Cyclopedia of Horticulture |
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Forsythia intermedia, Zabel (F. suspensa x F. viridissima,). Shrub, with slender, erect or arching branches: lvs. oblong to ovate-lanceolate, sometimes 3-lobed or ternate, usually coarsely serrate, 3-4 in. long: fls. almost like those of F. suspensa var. Fortunei. Gt. 1885:1182; 40, p. 397. Gn.W. 22:181. Var. vitellina, Koehne (F. vitellina, Koehne). With upright or spreading branches: fls. deep yellow, little over 1 in. long. Var. spectabilis, Spaeth (F. spectdbilis, Koehne). Upright with spreading and somewhat arching branches: fls. somewhat paler than of the preceding, 1 1/3 in. long, often 5-6-merous. Var. densiflora. Koehne (F. densiflora, Koehne). Upright shrub with divaricately spreading and slender arching branches: fls. crowded at the base of the branches, rather pale with flat slightly recurved corolla-lobes. Gt. 55, pp. 230, 231. Var. primulina, Rehd. Upright shrub, with spreading and arching branches: fls. crowded at the base of the branches, pale yellow; lobes of the corolla revolute at the margin.—F. intermedia is often confounded with forms of F. suspensa. In foliage it resembles much the following, which has the lvs. narrower, always simple, usually serrate only above the middle, with smaller teeth. It is as hardy as F. suspensa and very floriferous. CH
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Cultivation
The hybrid is best suited to a position with full sun or partial shade and is drought-tolerant.[3] Like some other forsythias, it is one of the earliest or even the earliest shrub to bloom in humid continental climate, well adapted to temperature changes, blooms with bright yellow flowers, that are noticeable even in twilight. This makes forsythias widely cultivated in gardens, parks and various green parts of European towns, with Forsythia x intermedia hybrid being the most popular among forsythias.
Propagation
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Pests and diseases
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Varieties
Cultivars include:
- 'Arnold Dwarf' - low-growing with pale yellow flowers[3]
- 'Beatrix Farrand' - a particularly floriferous cultivar[3]
- 'Gold Tide' ('Courtasol') - floriferous, with deep yellow autumn colour[3]
- 'Lynwood' - large flowers with broad petals[2]
- 'Karl Sax' - deep yellow flowers with orange lines in the thoat. Introduced by the Arnold Arboretum in 1960.[2]
- 'Spectabilis'[2]
- 'Spring Glory' - purple-tinged foliage in autumn[3]
- 'Variegata' - leaves with contrasting cream edges[3]
Gallery
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photo 1
photo 2
photo 3
References
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
External links
- w:Forsythia × intermedia. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
- Forsythia × intermedia QR Code (Size 50, 100, 200, 500)
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