Annual, bedding plant, readily available in flower in later spring; this flowering continuing until mid summer. If theare cut back then, the plants will flower for a second time in early autumn.
Chiefly used in beds andborders. May also be used under other plants, for instance roses.
Will grow in any reasonably nutritious soil. Propagation:
In February,of the so-called Fi hybrids are sown in a heated or frame at a temperature of 18-20°C. Seedlings are pricked out, kept even warmer, and are finally hardened off. In later winter, may be taken from overwintered plants.
Ageratum houstonianum: Height 10-20 cm.