This section is from the book "The American Garden Vol. XI", by L. H. Bailey. Also available from Amazon: American Horticultural Society A to Z Encyclopedia of Garden Plants.
All the varieties of the amaryllis are very beautiful and may easily be cultivated. Their principal requirement is an alternate season of rest and growth. To grow them well supply the plants with abundance of water and warmth. When coming into flower place them near the glass. After they have finished flowering, gradually withhold water, so that by the time they have finished growing, and the leaves are well ripened, the soil will be quite dry, and the bulb in a state of rest.
If amaryllis are wanted for winter bloom, the bulbs must be kept dry during the latter part of the summer, and in the autumn, after this rest, they should be newly potted in sandy loam and leaf-mould. Keep them in a warm place, and when the leaves make an appearance give them plenty of tepid water. By plenty of water I do not mean to drench them, so that the soil grows sour or sodden.
When buying bulbs select those which are solid.
Be sure to provide good drainage for the pots. Very many people do not realize the importance of drainage, and wonder why their bulbs rot and their plants barely exist, and oftentimes the only reason is lack of drainage.
New York. Greta Beverly.
 
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