Why are the leaves on my lupines curling up on the edges? (
Certified GKH Gardening Expert
It is a pH issue. You will have to test the soil or have it tested to figure out which way it has turned. They you can correct it with dolomitic lime to raise pH, or iron sulfate, to lower it.
This article will help you to care for these plants: https://www.gardeningknowhow.com/ornamental/flowers/lupine/growing-lupines.htm