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.
In bringing your bulbs out from their resting place to ornament the window garden, repotting is not absolutely necessary unless the pots are overcrowded with roots, in which case, give them a pot one size larger than they now occupy. In shifting do not break the ball and pack the new soil - a strong loam being preferable - as -firmly as possible. Put the pot in a tub of water and let it stand for 24 hours, in order that the ball will be thoroughly wet through. Pick all the dead leaves from the top of the bulb, without injuring or breaking the fleshy parts. Then sprinkle a little tobacco dust on the top of the bulbs, which will kill any insects that have made the bulb their winter quarters, and are ready for an attack on the new leaves as soon as they put in an appearance. Do not repeat watering until active growth commences ; then water liberally. Active growth and absolute rest are the requirements of the amaryllis. Bulbs not established, and in a dry state, should have small pots ; a four-inch pot is sufficient for a flowering bulb. - Queers.
 
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