Lathyrus odoratus. Striking shades of crimson, lavender, deep rose, navy blue, rose pink, and salmon, these climbers are 1.6m (6ft) and perfect for cut flowers. Sow Mammoth Blend sweet pea seeds for the earliest sweet peas to bloom from late spring to early summer. Direct sow sweet pea seeds at three week intervals for an extended bloom period. This variety has particularly large flowers on particularly long stems, so they’re a great cut flower for the farm table or the home garden. While they have a distinct fragrance, they are not like the intense Spencers or High Scent, so they will appeal to growers who prefer subdued scents.