Sweet Pea Mixed- Flower SeedOverview General Sowing Directions Sweet peas are one of the easiest flowering annuals to start from seed. Sweet peas are commonly direct seeded in the garden. Give them a site with full to partial sun and deep, rich, loamy, moist but well drained soil. Add plenty of organic matter (compost, well rotted manure, leaf mould, or humus) to enrich the soil and make it more friable. Approx. Seed Count 100