After my older bulbs bloomed last year most of them got quite a bit smaller in size, which is normal, but they didn't regain any size by the end of their growing season. Any ideas what caused this, was it because I didn't fertilize them enough, they had sun for several hours a day for most of the summer. Several have grown bulbletts which I will remove and plant separately at the end of this growing season..

They may have put their energy into the bulblets instead of plumping up. The question is whether or not they produced buds for this year.

So far 5 out of the dozen that I have are sending up buds, the others are still resting in the dark, so I guess that's pretty good, but I doubt the blooms will be as large with the smaller size bulb.

I think I have figured out why my Amaryllis bulbs were all smaller this year. It dawned on me the other day that last spring we had UV film put on our windows, I was told it wouldn't bother the plants, well I think they were wrong when it comes to the Amaryllis. All but 2 have bloom stalks, but only 1 per plant, Red Lion is just opening and the bloom is quite small compared to previous years. I think I will have to put them outside for the summer to see if that will help.

It would be interesting to learn if the UV film did affect the bulbs, since the film is deleting a range of wavelengths reaching the leaves. Maybe you will need to put at least some of them outside this summer to see if those do get bigger.

Barbara, I am convinced that that is the reason, they still gets lots of light with bright afternoon sun in the SW facing bay window. I kept wondering why they all shrunk in size since they are mostly different years, the oldest being 2012 and this had not happened in the past, the bulbs usually got larger or at least had off sets.We had it done because it got so hot in the summertime in the front of the house with many SW windows.

I thought they naturally do that, bulb size getting smaller eventually, especially if not planted in ground where they have better growing space and foliage development that helps return the needed stuff back to the bulb?

Tarev, I kept them well fertilized, and the thing is, they never shrunk until that film was put on the windows. Once they finish blooming I am gong to repot all of them, separate the babies.

Sometimes I think they just go on a cycle. A couple of years okay, then rest and may look smaller till it builds up again. I am still learning with these bulbs.

I hope they grow better once you put them outside to enjoy the summer sun. At least your summer conditions are way better than our thermal dry heat here by then!

I hope they do better too, I will have to watch for frost in mid August, that's the downside of living at this altitude, short summers, cool nights, with early frosts.

So funny on our side, we get the very long dry summer, but it gets way too hot, that the plant will just sleep it off once we are in the middle of it, and wait for Fall.

It can be hot and dry during July and the first 2 weeks of August, then we start to get some rain.

Oh they love the rains by then! We get no rain at all usually from April to Nov.

That sure is a long dry spell!

Yup, survival of the fittest here when summer comes, thankful it is raining now, but we still are in drought.