Perennial, or everlasting, sweet peas were grown by Thomas Jefferson at Monticello. The very long, lush, trailing vines are gorgeous rambling over shrubs or fences, gracing an arbor, or used as a groundcover. Withstands summer heat well, is fairly drought tolerant, and attracts pollinators. Flowers are lovely in bouquets. Usually scentless.
Botanical Name: Lathyrus latifolius
Native: Africa and Europe
Hardiness: Perennial in USDA zones 3-8
Plant Dimensions: 6'–9' vines
Variety Information: 1″ flowers in white, pink, mauve, and violet
Exposure: Full sun to part shade
Bloom Period: Spring to fall
Attributes: Attracts Pollinators, Cut Flower, Deer Resistant, Drought Tolerant, Heat Tolerant
When to Sow Outside: RECOMMENDED. Cold Climates: 4 to 6 weeks before your average last frost date, or as soon as the soil can be worked. Mild Climates: Late summer to fall for winter bloom. Ideal temperature is 55°–65°F.
When to Start Inside: 4 to 6 weeks before transplanting out in the fall. Sow in biodegradable pots and grow in cool conditions (55°F?65°F).
Days to Emerge: 10–21 days
Seed Depth: 1″
Seed Spacing: A group of 3 seeds every 12″
Thinning: When 3″ tall, thin to 1 every 12″