".......................... When it is done blooming, you should remove the
stalk that the flowers were on. You can then plant it outside (assuming you
live where people commonly plant hyacinths outdoors). Let the foliage turn
brown and die back naturally; this is the plant's way of storing energy for
next year's bloom................."

Give the bulbs liquid plant feed every 2 weeks from now to the time the
leaves die back.
Don't put outside till all chance of frost has gone and be careful not to
damage the roots if you plant it out.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk