I don't fertilise bulbs at all and I don't grow them in a dedicated bed. A bulbs only bed sounds very boring to me. Mine are mixed in perennial beds and the whole lot gets get a dose of compost whenever I empty the bin. Otherwise they are left to themselves.

What happened to Jay’s reply post with pictures?

That's a bit of a pity Jeb because i would have liked to read (and see) your post.

OP, what sort of bulbs are you talking about? Tulip bulbs, for instance, will 'get smaller' after flowering. What they are really doing is breaking up because the plump, mature bulbs that you bought were at a stage of reproducing after they had flowered.

Those smaller bulbs (if they don't rot during their summer resting period) will grow larger each year until they reach flowering size.

It's about 400+ daffidols flanking the driveway. The -bed- in question is also the same bed where annuals go yearly. Drains well but this area does get irrigation in the summertime. Blooms are fine...just when I dug them up 2 years ago to reseat them a bit, they were just noticably smaller than from *grower bulb ordered to be planted*