Seed Treatment:
• Scarify seeds by gently nicking the seed coat with a nail file or soaking them in warm water for 8–24 hours before sowing.
When to Sow:
• Outdoors:
– In mild climates, sow in fall (September–November) for early spring blooms.
– In colder climates, sow as soon as the soil can be worked in early spring (4–6 weeks before the last frost).
• Indoors:
– Start seeds 4–6 weeks before your last frost date if you want to get a head start.
Sowing Instructions:
• Sow seeds 1 inch (2.5 cm) deep in well-draining soil.
• Space seeds 2–3 inches (5–7.5 cm) apart in rows or clusters.
• Water gently to settle soil.
Light Requirements:
• Requires full sun for best flowering (minimum 6 hours of direct sun per day).
Soil Requirements:
• Prefers rich, well-draining soil with good organic matter.
• pH range: 6.0–7.5.
• Add compost or well-rotted manure before planting for best results.
Watering:
• Keep soil consistently moist but not waterlogged during germination and establishment.
• Once established, water deeply when the top inch of soil is dry.
Spacing:
• Thin or transplant seedlings to 6 inches (15 cm) apart when large enough to handle.
Growing Tips:
• Provide a trellis, netting, or support—sweet peas are climbing vines.
• Mulch to retain moisture and keep roots cool.
• Pinch out the growing tips when seedlings reach 6 inches tall to encourage bushier plants.
• Deadhead regularly to promote more blooms.
• Sweet peas are annuals but will self-seed in favorable conditions.