Seed Treatment (Pre-Planting Preparation)
Cold Stratification:
- Mix seeds with moist sand or place between damp paper towels.
- Seal in a plastic bag and refrigerate at 35–40°F (2–5°C) for 60 days.
- Check weekly — if seedlings sprout during stratification, plant immediately.
- Soak seeds in lukewarm water for 12–24 hours before planting.
Best Time to Sow
Indoors: Late winter to early spring (February–April)
Outdoors: Fall (for natural stratification) or spring after frost danger has passed
Germination Conditions
Optimum Temperature: 70–85°F (21–29°C)
Germination Time: 14 to 60 days AFTER stratification
Daylight: 12–16 hours/day of light for best results (use grow lights if indoors)
Planting Instructions
Sowing Depth: ¼ inch (6 mm) – lightly cover with soil or vermiculite
Soil: Well-draining, fertile soil with moderate moisture
Light Requirements: Full sun (minimum 6–8 hours/day)
Spacing: 3–5 feet (1–1.5 m) apart if growing multiple vines
Watering: Keep soil evenly moist but not soggy during germination
Post-Germination Care & Growing Tips
- Transplant seedlings once they have 2–3 true leaves and all risk of frost has passed
- Provide a sturdy trellis, fence, or arbor for climbing
- Drought-tolerant once established but benefits from deep watering during dry spells
- Prune in late winter or early spring to control growth and shape
Attracts hummingbirds, butterflies, and pollinators