Posted: 18/11/2012 at 18:32
As with so many things in gardening, there is more than one way of doing things, so more than one answer!
I remember visiting bulb expert Rupert Bowlby once and being reminded that Hippeastrum are actually an evergreen bulbous plant, so can be kept in leaf all year round. With this in mind it's best to keep them growing strongly through summer. Grow in good light, and keep watering and feeding.
Bulbs then need a cool period to help iniate new flowers inside the bulb.
I've just checked teh web link given by Norm2 above:
and teh advice here looks pretty good.