Day lilies aren't blooming.

I have day lilies in several areas.
They are all doing fine, except 3 that I have on the south side of the house. They are in full sun.
They have big buds on them, but they don't open.
There are no deadheads.
What's up?
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BTW...they are 3 years old. They did fine the first 2 years and I had to deadhead them every day.
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Hi Mitch To me it sounds as though they are not getting enough moisture at root zone - very important even if they do like full sun. They really respond well to an annual mulch to help keep the roots a little cooler and moist. Hope this helps Data
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Thanks...I'll try more water. I should have mentioned that they were in bloom until about 2 weeks ago. I just put down a nice heavy coat of mulch, too.
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Data said:

Bullshit.
Bullshit.
It won't, google-posting-dumbass.
To the OP:
The last thing you want to do with bulbs is keep them moist. They'll rot. Bulbs prefer soil on the drier side.
Are the unopened buds falling off of the stalks? They just may be slow. =)
How deep below the soil line were they planted? How much mulch on top of that. What's their feeding schedule? If you're in one of the areas that were affected by the hard freezes around Easter, it could very well have affected some of the bulbs. Changes in your local weather from that of the past two seasons probably is also affecting your lily bloom. It could also be a root-bourne disease.
I doubt it's from lack of water. Have they received any water, in the last month?
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No, the buds seem firm and "healthy" looking. The foliage is also healthy looking.

They were put in as plants, not bulbs.

About 3".

Whatever nature gives them. :)

Oh, yeah. I'm in NW Illinois. We had some major long, heavy rains. I think someone said that 2 weeks ago we got 5" in 3 days.
The soil is very well-drained, by the way.
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Mitch said:

Perhaps helping them with some 5-10-15 or 6-12-12 is in order. =) Fertilizing them twice a season, with either, helps.

I wouldn't worry about them. Most varieties of day lilies are pretty tough. The weather probably was the biggest factor, but if you haven't been feeding them, then the nutrients per plant is probably getting pretty low. Fertilizing now, and dividing them this fall, should bring back the flowering, next season.
When first reading and replying, I had "true" lilies in mind. They *are* bulbs, but most day lilies grow from fleshy roots. Still, they prefer not to have their feet wet, IME. My apologies for using the wrong terminology. =)
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