Have you had a lot of rain lately or have you watered them a lot? They are sensitive to wet feet and actually manage well if a little dry...as long as it doesn't get too hot...b/c they'll wilt in that too.

I think you potted up to one gallon pots when it should have been 4 inch size. Also I believe your soil retains too much moisture and contains too much fertilizer. As has been said too much water in the root zone. Al

Maybe they need real sunlight and not lights? I did the same as you, but I planted mine in peat pots the last week in March and mine have not wilted (knock on wood). I did use the moisture control formula, did you?

These are in 4" pots and I used regular miracle grow potting mix. Not the moisture control. Maybe they are too wet. I tried not to water much but when I saw the wilting I thought they were lacking water. This is the first time I'm trying lupine so I'm still learning. I think it is too early to put outside. It supposed to go below freezing tonight. Do they take the cold?
I may try some seeds outside as well.

Yeah, my lupine seedlings suffered this year when too moist and I agree that seedlings that size should stay in 4" pots until at least twice that size or be put straight into the ground. But I'm growing CA native lupines, not Russell hybrids, so that might make a difference.

I would not put out till after frost (that is my plan and I am in PA) Check out the website below - they have great advise on how to grow lupines.

http://www.snakeroot.net/farm/index.html

Here is a link that might be useful: lupines

Tried growing lupine from seed... planted about a dozen 3 yrs ago in sunny sandy location. One survived and looks healthy but have never had a bloom yet. One source I saw said they are annual and require seed to come back but apparently not so.

This year I purchased about a dozen potted plants, post-bloom, on clearance. They've all wilted way back before I got a chance to plant (though they've been watered regularly) and am nervous they have died off! Any comments? I LOVE lupines and can't wait to get them established in my yard in MN ;)! Thanks, Sarah