Seed Treatment (Cold Stratification Required)
Cold Stratification Method:
- Soak seeds in warm water for 12–24 hours to soften the seed coat.
- Mix with moist sand, peat, or vermiculite.
- Place in a sealed plastic bag and refrigerate at 35–40°F (1–4°C) for 90 days.
- Check periodically to ensure the medium remains moist but not soggy.
Sowing Instructions
- When to Sow:
- Indoors: Start seeds immediately after stratification in late winter to early spring.
- Outdoors: Sow in late fall for natural stratification over winter.
- Soil Requirements:
- Prefers well-draining, fertile soil with a neutral to slightly alkaline pH (6.5–7.5).
- Avoid heavy clay soils unless amended for better drainage.
- Light Requirements:
- Requires full sun (at least 6 hours of direct sunlight daily) for best growth and blooming.
- Sowing Depth:
- Sow seeds ¼ inch (6 mm) deep in seed trays or pots.
- Cover lightly with fine soil and gently firm.
- Watering:
- Keep soil evenly moist but not waterlogged.
- Use a mist spray to water gently during germination.
- Germination Time:
- Germination can take 30–90 days, even after stratification.
- Be patient — lilacs are slow to start from seed.
- Spacing & Transplanting:
- When seedlings have developed a few sets of true leaves, transplant into individual pots.
- Once established, space plants 3–6 feet (1–2 meters) apart in the garden.
Growing Tips
- Syringa josikaea is a cold-hardy, fragrant lilac species known for its late-blooming, tubular pink-lavender flowers and excellent mildew resistance.
- Attracts bees, butterflies, and hummingbirds, making it great for pollinator gardens.
- Prune immediately after flowering to maintain shape and encourage next year’s blooms.
- Water regularly during dry periods, especially in the first year after planting.
- Deer- and rabbit-resistant once established.
Enjoy the long-lasting beauty and sweet scent of this underappreciated lilac, perfect for hedges, wildlife gardens, and perennial borders.