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While daffs *do* produce seed, many bulbs propogate most easily
through division. After 3-4 years in place, you may notice an
abundance of foliage with few blooms. If you dig, you will find many
bulbs have developed additional 'cousins', like a giant shallot.
Separate these and re-plant. Unfortunately, the ideal time for doing
this is *after* the foliage has died back into invisibility, and you
have no clue where they were/are. Which means either keeping
meticulous records or marking the areas with sticks or labels while
the foliage is still growing.

There's a much easier way. Like snowdrops, narcissi don't mind at all
if you dig them up as soon as the flowers have finished when the foliage
is still green, divide, and replant. The leaves tend to look droopy
after, but that doesn't seem to affect them adversely.

Getting flowering daffs from seed takes 4-7 years. A bulb division
usually a maximum of 2 yrs, depending on size. I believe my record was
27 bulbs from one (after no lifting for 4-5 years). Of course, many of
these were quite small, but there were at least a dozen good sized
ones well worth re-planting.

Even the weeniest ones are worth replanting..once they have their own
bit of soil space they grow on surprisingly fast to flowering size.

Janet