Page:Gardening for Ladies and Companion to the Flower-Garden.djvu/104

96 liable to be attacked by the red spider. Many of the shrubby climbers may be treated as annuals, and raised from seed every year in January, and planted out in June; but they do still better treated as biennials, and sown one year to flower the next.

All the most beautiful hot-house climbers, such as the Allamanda cathartica, the Ipomæa Horsfalliæ, Petræa volubilis, &c., may be grown in the open air, by keeping their roots in heat; that is to say, if the roots are grown in a stove, or in a pit heated by hot water or flues to stove-heat, the stems may be brought through some opening purposely contrived, and twined over a trellis in the open garden. A very striking effect may be thus produced by having a bed heated by hot-water pipes concealed under ground, at the foot of a veranda, over which these beautiful tropibers may be trained.