I grow some daffs and quite a few Tulips in pots; I leave them in the
pot all year, but I find the secret is when they come into bud, feed
them.
A high potash feed is best - something like tomato feed with an NKP
of 15:15:30 is good. Apply at half strength weekly for 4 weeks or
until the leaves begin to decay.
Clifford
Bawtry, Doncaster, South Yorkshire