I normally try to plant mine about 6-8 weeks before the ground
gets really cold and frosty. Here in zone 4, that means I'm planting
around mid to late-October.
When the come up in the spring - and they will because nothing eats
daffodils - you get to enjoy those gorgeous colors.
When the bulbs are done you have one choice to make. Whether to
deadhead or not.
Deadheading means to cut the spent flower stalk off
right down at the base of the stem (do not cut off any leaves
at this point)
I tend not to do this deadheading because I want my bulbs to set seed -
ripen that seed and allow the seed to fall into the garden so my bulbs
will naturalize. I'll get more of them as they spread naturally. But
this is up to you. I note that in some gardens, the hybrids will not
set seed or will not come true from seed (I tend to grow species or
old-fashioned varieties) so deadheading is a good idea to keep the
Most Important Thing
real trick to growing a great bulb is to not cut off the foliage before
it starts to turn yellow. I know this can take some time and this
foliage gets in the way of planting annuals or enjoying flowering
perennials but the reality is that the leaves are pumping
sunlight-energy down to the bulbs for next year's flowers.
If you don't
let them do this, you won't see flowers next year as the bulb won't
have the necessary energy.
Once the leaves turn yellow- daffodil maintenance kicks into gear and
you simply trim the leaves down to the ground and forget about the
daffodils for another season.