Use sharp, clean pruning shears or clippers to cut the entire lupine plant back by one-half in early spring. Continue watering lupine plants until they begin to die back in midsummer. This will prolong the lush appearance of the foliage. Take stem cuttings in late summer when the weather begins to cool, if desired.

Should lupins be cut back for winter?

To get the longest flowering period from your lupins, cut off the flower heads when they have died down. ... New, smaller flowers will soon appear extending the flowering season. WINTER CARE. As the foliage starts to turn brown and die down in winter there is no need to do anything.

When should lupins be cut back?

When should you cut back lupins? You should carefully deadhead lupins once their flowers have faded or died. BBC's Gardener's World states: "In autumn, cut lupins right back to the ground after collecting seed. "Lupins are not long-lived plants – expect to replace plants after about six years.”