Calluna vulgaris, commonly known as Heather, is a low-growing, evergreen shrub that produces small, colorful flowers and thrives in acidic soils. Growing heather from seed requires patience, as germination can be slow and irregular.
1. Seed Preparation
- Mix seeds with moist sand and refrigerate at 2–4°C (35–40°F) for 4–6 weeks to simulate natural winter conditions.
- Check weekly: If seedlings sprout in the fridge, remove them gently and plant immediately.
2. When to Sow
- Best time: Early spring or autumn.
- Can be sown indoors or in a cold frame for better control over germination conditions.
3. Soil & Location
- Prefers well-draining, acidic soil with a pH of 4.5–5.5.
- Use a mix of peat moss, sand, and perlite for optimal drainage.
- Choose a full sun to partial shade location.
4. Sowing Depth & Spacing
- Do not cover the seeds with soil, as they require light to germinate.
- Temperature: 59-68°F (15-20°C)
- Gently press seeds onto the surface of moist soil.
- Space seedlings 15–30 cm (6–12 inches) apart when transplanting.
5. Watering & Care
- Keep the soil consistently moist but not waterlogged.
- Use a fine mist sprayer to avoid disturbing the tiny seeds.
- Germination can take 30-90 days (AFTER stratification) or longer. These perennial seeds germinate slowly and inconsistently over an extended period. Be patient and avoid discarding seed trays too soon.
6. Growth & Maintenance
- Once seedlings are strong enough, harden them off before planting outdoors.
- Mulch with pine needles or peat moss to maintain soil acidity.
- Avoid excessive fertilization—use a light application of an acid-loving plant fertilizer in early spring.