Propagate lupines in spring. ‘You can grow lupines from seed, from basal cuttings, or by division,’ says a gardening expert at Homes & Gardens Drew Swainston. ‘Seeds are best sown in early spring to be planted out from May onwards. Basal cuttings should be done in spring, as would division – though the latter is not the most reliable method of propagating lupins. Overall, whatever way you want to propagate lupins, spring is the best time of year to take on the task.‘