All this is necessary to build up the plant’s resources do that is can make a large flower again. Otherwise it can take two or three years to build up to flowering size again.
I got some Amaryllis last year which flowered beautifully. When the leaves died off I cut them to just above the top of the bulb and put them in a brown paper back to rest. I have replanted them now as the leaves started to grow, there is no sign of any flowers on them yet but the leaves are huge. Is this normal?
Amaryllis or hippeastrum needs lots of feeding right through the summer after flowering. It needs bright light, sunshine, plenty of moisture.