Seed Prep (Cold Stratification Required)
- Cold Stratification (60–90 days):
- Place seeds in a moist paper towel or moist sand inside a sealed plastic bag.
- Store in the refrigerator (35–40°F / 2–5°C).
- Check weekly to make sure they stay moist but not soggy.
- If seeds sprout during this time, plant them right away.
- Soak Before Planting:
- Soak seeds in lukewarm water for 12–24 hours before sowing to help soften the seed coat.
Planting Instructions
- Best Sowing Time:
Indoors: Late winter to Early Spring (January–March)
Outdoors (Natural Stratification): Fall (October–November) - Soil: Well-draining, fertile soil (pH 6.0–7.5)
- Sunlight: Full sun to partial shade
- Use grow lights if you're starting them indoors—keep lights on for 12–16 hours daily to mimic springtime daylight.
- They do not require light to germinate, but providing consistent light helps prevent fungal issues and supports early seedling growth once they emerge.
- Planting Depth: Sow 1/8 inch (3 mm) deep; cover lightly
- Spacing: Space plants 12–18 inches (30–45 cm) apart
- Watering: Keep soil moist but not soggy during germination
- Germination Temperature: 65–75°F (18–24°C)
- Germination Time: 28 to 90 days after stratification (sometimes longer)
After Germination Care
- Transplant when seedlings are 4–6 inches (10–15 cm) tall
- Water regularly, especially during dry spells
- Prune after flowering to encourage fuller, bushier growth
- Forsythia is a tough shrub once established and tolerates a wide range of soil types
Get ready to enjoy a burst of bright yellow blooms each spring — one of the first signs that winter is over!