They like acidic soil. If I remember, I will add sulfur or aluminum sulfate to the soil when planting since my soil pH is neutral to basic.
Once planted, they do not like to be transplanted.
Lupins are short-lived perennials, thus I plant more every year. This year I planted 50 'Tutti Frutti' seeds - and I spread them throughout the gardens.
Allowing lupins to go to seed may shorten the life of the plant, so I don't allow mine to go to seed.
Give lupins a try! What have you got to lose???
And also starring in my late May garden: