. The Book of gardening; a handbook of horticulture. Gardening; Horticulture. ON GREENHOUSE PLANTS. 717 take cuttings in early summer and grow like Zonals. They are also useful for training over pillars or on the roof of the greenhouse; when so utilised they should be cut back at the end of every year. Sorts : Souvenir de Charles Turner, Madame Crousse, Jeanne d'Arc, Abel Carriere, and Albert Crousse. (4) Sweet-scented Leaved Pelargoniums.—These are grown chiefly for the delightful scent of their leaves, but they also flower freely. They are best treated as large trained plants, and flower dur
. The Book of gardening; a handbook of horticulture. Gardening; Horticulture. ON GREENHOUSE PLANTS. 717 take cuttings in early summer and grow like Zonals. They are also useful for training over pillars or on the roof of the greenhouse; when so utilised they should be cut back at the end of every year. Sorts : Souvenir de Charles Turner, Madame Crousse, Jeanne d'Arc, Abel Carriere, and Albert Crousse. (4) Sweet-scented Leaved Pelargoniums.—These are grown chiefly for the delightful scent of their leaves, but they also flower freely. They are best treated as large trained plants, and flower during the summer. Cut back, shake out old soil, and repot in autumn, and then grow same as the show varieties. Sorts : P. quercifolium (Oak-leaved), P. odoratissimum lobatum, P. denticulatum Shotten- ham Pet, and P. capitatum. With regard to these plants, it is very interesting to note the insignificance of their first parents, and how they have been evolved and gradually improved during compara- tively recent years, until their present state of per- fection has been reached. They admirably illustrate the progress of the gar- dener's art, showing what can be done by hybrid- isation, cross-fertilisation, care, patience, perse- verance, and intelligent selection. The Zonals of to-day were obtained originally from the small and insig- nificant P. inquinans (Fig. 463), which is really a shrub with scarlet flowers, and the species P. zonale (Fig. 464), also scarlet. The Ivy-leaved section were obtained from P. peltatum (with tuberous roots, and, as the name implies, peltate-leaves) and Zonal varieties, thus obtaining the leaf and habit of the one and the flowers of the other; while the beau- tiful Show varieties were obtained from P. grandiflorum, a shrubby species with red and white flowers. Petunias.—The double varieties of these (Fig. 465) are fine and effective, and can be propagated by either seed or cuttings. Sow seed in the warm pit in March, and grow in the cool pit or in
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