LIST OF PLANTS 187 
greenhouse kinds by removing the thick fleshy rhizomes 
(called ‘‘knaws”), cutting them into about 2-inch 
lengths, planting in very sandy compost or coconut- 
fibre, only just covering them, plunging in bottom heat 
in a warm house, and giving very little water until signs 
of growth. are apparent. 
ZAUSCHNERIA (CALIFORNIAN FucusiA).—Increase this 
pretty flower by dividing old plants in spring, and sow 
seed on a gentle hot-bed in March. Insert cuttings of 
side-shoots in pots of sandy soil in a cold frame in 
September, place in a greenhouse for safety during 
winter, and plant out in April in well-drained positions 
in the rock garden. 
ZEBRINA.—See Tradescantia. 
ZEPHYRANTHES.—These pretty bulbs, both hardy and 
tender, are propagated by offsets, which in some species 
are very freely produced, also by seed. 
ZINGIBER (GINGER).—Readily increased by dividing 
the rhizomes in spring. 
ZINNIA.—Seed of the favourite annual Z. elegans 
should be sown on a mild hot-bed about the end of 
March, and the seedlings pricked out in boxes or frames 
when large enough, to plant out in June. 
