Aptly named, Mammoth sweet peas have extra-large flowers with lengthy stems—perfect for cutting! The subtle, sweet scent is delightful, too. Developed in the 1980s from Early Multiflora Gigantea, a Spencer-type sweet pea, this variety boasts drought and heat resistance, which results in a longer season of blooms. Attracts pollinators. Deer resistant.
Caution: Most parts of this plant are toxic if ingested.
Botanical Name: Lathyrus odoratus
Hardiness: Frost-tolerant annual
Plant Dimensions: 5'–6'
Variety Information: 1''–2″ flowers with moderate scent in shades of rose, blue, salmon, scarlet, white, lavender, and burgundy.
Exposure: Full Sun to Part Shade
Bloom Period: Spring to Summer
When to Sow Outside: RECOMMENDED. Cold Climates: 4 to 6 weeks before your average last frost date. Mild Climates: Late fall to early winter for spring bloom. Ideal soil temperature is 55°–65°F.
When to Start Inside: 4 to 6 weeks before your average last frost date.
Days to Emerge: 10–21 Days
Seed Depth: 1″
Seed Spacing: A group of 3 seeds every 6″
Thinning: When 3″ tall thin to 1 every 6″