Some gardeners hate to take flowers from the garden, but if you grow sweet peas, you must pick them regularly to encourage them to go on producing their sweet-as-sugar blooms. If you allow them to fade on the plant, they will form seeds, and the plant will feel its life's work (self-perpetuation) is done, and cease making new flowers. Sweet peas are hungry, so be sure to keep them well fed. And while you have the secateurs or scissors out, cut a few roses (look for ones that have bloomed in less-conspicuous positions) and bring them into the house. The smell of garden flowers indoors is one of the headiest summer fragrances.