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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Campsis grandiflora' from the website Trees and Shrubs Online (treesandshrubsonline.
A deciduous climber 20 to 30 or more ft high; stems glabrous. Leaves pinnate, composed of seven or nine leaflets, which are ovate, 11⁄2 to 3 in. long, about half as wide, long-pointed, coarsely toothed, glabrous on both surfaces. Flowers in terminal, pendulous panicles of six or twelve, produced at the end of the current season’s growth in August and later. Corolla deep orange and red, widely trumpet-mouthed, narrowing to a funnel-shaped tube; 2 to 3 in. long and wide, with five broad, rounded lobes. Calyx 11⁄4 in. long, bell-shaped, with five slender lance-shaped lobes 1⁄2 in. long. Bot. Mag., t. 1398.
Native of China, long cultivated in Japan; introduced in 1800. Even more gorgeous than C. radicans, it is, unfortunately, not so hardy. It must have a sheltered sunny wall, and even there does not with us produce so wonderful a display as it does on the continent. It is easily distinguished from the better-known radicans by the panicled inflorescence, the broader mouth of the corolla, glabrous leaves, and the much more deeply lobed calyx.
The statement at the bottom of page 488 about the cultural needs of this species is also true of its more desirable hybrid ‘Mme Galen’. And not only does it need the sunniest wall but also plenty of room. It is not a climber that can be left to look after itself: the growths of young plants should be carefully spaced and tied in.