How do you grow lavender from seed?

Growing lavender from seed can be a bit more challenging and requires more patience than growing from cuttings or purchasing established plants, but it's very rewarding! Here's a beginner-friendly guide:

1. Choose the Right Lavender Variety

For beginners, especially in cooler climates, English Lavender (Lavandula angustifolia) varieties are the best choice. They are generally more tolerant of cold and the most common types available as seeds.

• Good varieties to look for: 'Munstead', 'Hidcote', 'Vera'.

2. The Essential Step: Cold Stratification

Lavender seeds have a natural "dormancy" that needs a period of cold and moisture to break, mimicking a winter. This is called cold stratification and it's crucial for good germination rates. Don't skip it!

• When: Plan to start this process about 3-6 weeks before you want to sow your seeds indoors. This usually means starting in late winter or early spring.

• How to do it:

  1. Get a paper towel: Lightly moisten a paper towel (it should be damp, not dripping wet).

  2. Scatter seeds: Sprinkle your tiny lavender seeds evenly on one half of the damp paper towel.

  3. Fold and bag: Fold the other half of the paper towel over the seeds. Place the folded paper towel into a resealable plastic bag or a small, lidded container.

  4. Refrigerate: Label the bag with the date and type of seed. Place it in your refrigerator (typically 35-41°F or 1-5°C) for 3 to 6 weeks.

  5. Check moisture: Check periodically to make sure the paper towel stays moist. If it starts to dry, mist it lightly.

3. Indoor Seed Sowing (Giving Them a Head Start)

Starting seeds indoors gives you more control over their environment, which is helpful for slow-germinating lavender.

• When to sow: After cold stratification, sow seeds indoors 10-12 weeks before your region's average last spring frost date.

• Containers: Use clean seed-starting trays with individual cells or small pots (2-4 inches) that have excellent drainage holes. Lavender hates sitting in soggy soil.

• Seed Starting Mix: Use a high-quality, sterile, and very well-draining seed-starting mix. Look for mixes that are light and airy, or mix in extra perlite or coarse sand (about 20-30%) to improve drainage.

• Sowing the seeds:

  1. Fill your containers with the moistened seed-starting mix.

  2. Gently moisten the mix again after filling.

  3. Sprinkle the tiny lavender seeds directly on the surface of the soil. Lavender seeds need light to germinate, so do not bury them deeply. You can gently press them down onto the soil surface to ensure good contact.

  4. Lightly mist the surface with water using a spray bottle.

4. Creating the Right Germination Environment

• Light: Place your seed trays under grow lights for 12-16 hours a day. Position the lights just a few inches (2-4 inches) above the seed tray. A sunny windowsill alone is usually not enough, especially during shorter winter days.

• Temperature: Lavender seeds germinate best with consistent warmth. Use a seedling heat mat under your trays to maintain a soil temperature of 65-75°F (18-24°C).

• Humidity: You can cover the trays with a clear plastic dome or plastic wrap to maintain humidity until you see sprouts. Once they start to emerge, remove the cover to ensure good air circulation.

• Watering: Keep the soil consistently moist but not soggy. Mist the surface carefully or water from the bottom (place the tray in a shallow pan of water for a short time) to avoid disturbing the tiny seeds. Overwatering is a common killer of young lavender.

5. Patience, Patience, Patience!

Lavender seeds are notoriously slow and often germinate unevenly.

• Some seeds might sprout in 2-3 weeks, but others can take up to 3 months or even longer. Don't give up too quickly if you don't see immediate results. Continue to provide the right conditions.

6. Caring for Your Young Seedlings

Once your lavender seedlings emerge:

• Air Circulation: Ensure good airflow around the seedlings to prevent fungal diseases. A small fan on a very low setting for a few hours a day can help strengthen their stems and improve air movement.

• Light: Keep the grow lights about 4-6 inches above the seedlings, adjusting as they grow taller.

• Watering: Continue to water carefully, allowing the top layer of soil to dry out slightly between waterings. Avoid letting them sit in standing water.

• Thinning (if needed): If you have multiple seedlings growing in one cell, wait until they develop their first set of "true leaves" (the second set of leaves that look like tiny lavender leaves). Then, gently snip off the weaker seedlings at the soil line, leaving only the strongest one per cell.

• Potting Up: When your seedlings are about 2-3 inches tall and have developed a few sets of true leaves, gently transplant them into individual 4-inch pots. Continue to use a well-draining potting mix.

7. Hardening Off (Getting Them Ready for Outside)

If you plan to move your lavender plants outdoors, they need to gradually get used to the harsher outdoor environment. This prevents shock and increases their survival rate.

• When: About 7-14 days before your planned outdoor planting date (which should be after all danger of spring frost has passed).

• Process: Start by placing the pots in a sheltered, shaded outdoor spot for an hour or two on the first day. Each day, gradually increase the amount of time they spend outdoors and their exposure to direct sunlight. Bring them indoors at night, especially if temperatures are still cool.

8. Outdoor Planting (Location Matters!)

• Timing: Plant outdoors after all danger of frost has passed and the soil has warmed sufficiently.

• Full Sun: Choose a spot that gets at least 6-8 hours of direct, unfiltered sunlight daily.

• Excellent Drainage: This is absolutely critical for lavender. It will not survive in soggy soil.

  • If you have heavy clay soil, amend it generously with coarse sand, fine gravel, or grit.

  • Consider planting in raised beds or on slight mounds to ensure water drains away quickly.

• Air Circulation: Space plants adequately (18-36 inches apart depending on the variety's mature size) to ensure good airflow, which prevents fungal issues.

• Watering (Established Plants): Once your lavender is established (after its first year), it's very drought-tolerant. Water deeply but infrequently, allowing the soil to dry out completely between waterings. Overwatering is the most common cause of death for mature lavender.

By following these steps, even as a beginner, you can successfully grow beautiful and fragrant lavender plants from seed!