Cut off the old flower stems leave the leaves.
Yes.
Some gardeners do cut back the leaves in fall to prevent mold and disease.
Lupines is a perennial. You chop off the flower head after its done blooming and the plant will die down on its own and come back after the winter.
Cut off the old flowers the foliage will die back naturally in the Autumn.
Lupines need water regularly depending on how dry the soil can get. Make sure the soil doesn't dry out completely. Lupines need TLC.
After blooming is done, you can cut back the flower stalks, but don't cut back the leaves until you are ready to separate and transplant irises in the fall. When you take them out to replant, cut the leaves down into about a 4 to 5 inch fan shape.
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Wait until the flower spike dies back then cut it just above the leaf.
Lupinus is a genus of flowering plant in the legume family. There are about 280 species of Lupine.
Cut a wedge in the direction you wish the tree to fall. Make consecutive cuts from both sides and a final cut from the back.
I have lupines growing 15 feet from a very large black walnut. They have been doing fine for 2 years.