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My lupin leaves have developed white powder on the leaves, it seems to have gone all floppy too, what causes this?
Mine too! They are baby ones that I'm keeping in the greenhouse. I just thought it was too much humidity.
Ho I'm glad I'm not on my own, this has never happened before
Mine too. I thought it was some for of mildew, ive taken off the leaves and new little ones are coming through. They look OK at the moment. Ive started watering just at the bottom rather than over the top. they aren't floppy though one of them even has a little flower forming.
Yes mildew. Cut everything back to ground level, clean up and mulch if you can. Water if dry. Cuttimg back will prevent all those tiny snails gorging on lupins right now. Lupins look very tatty for a while after mid summer for a while.
They dont really need to be in the greenhouse yet. Bring them back in about end of September or into October, just to overwinter, then they can be planted out next March, they will be nice sized plants by then,