How to Fill a Seed Tray for Successful Seed Starting

How to Fill a Seed Tray for Successful Seed Starting

Starting seeds in a tray instead of sowing them directly into the ground offers many advantages, especially for delicate or slow-growing plants. Using a seed tray provides a controlled environment that protects young seedlings from harsh weather, pests, and weed competition. With a finely textured, debris-free compost, seed trays can improve germination rates and help your plants get a strong start.

Benefits of Using a Seed Tray

  • Controlled Environment: Seed trays shield delicate seedlings from unpredictable outdoor conditions.

  • Better Germination: The finely textured compost in trays makes it easier for seeds to sprout.

  • Maximized Space: Grow many seedlings in a small area and transplant them into your garden when they are robust.

  • Early Start in Spring: Ideal for early spring sowing when outdoor soil is still too cold.

Our Seed Compost Recipe

For nearly all our seed starting, we opt for a peat-free multipurpose compost mixed with perlite and/ or grit. This combination creates the perfect environment for seed germination.

6 parts ‘multi-purpose’ compost

1 part perlite/grit

How to Prepare a Seed Tray for Sowing

Getting your seed tray ready properly gives your seeds the best chance to sprout and grow strong.

1. Fill the Tray with Compost

Use a good-quality seed compost mix to fill your seed tray. To remove air pockets, give the tray a gentle tap on the table or lightly press the compost down with your fingers. Be careful not to press too hard—seeds need air to germinate!

2. Level the Surface

Check for any sunken spots where air pockets may have collapsed, and top them up with compost. Then, lightly scrape your hand or a flat tool across the top to remove extra compost. This prevents overfilling and stops seeds from getting washed away when you water.

3. Even Out the Compost

Making sure the compost is evenly spread in each cell helps with consistent watering. If some areas are too compacted or too loose, seeds may not grow as well.

Filling a seed tray with compost

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