We’ve been making our own seedling soil for a decade. Yet, this is the first time we’ve attempted to document it as a recipe. For germinating seeds, like the leeks, onions and shallots we started yesterday, we use a light, less nutrient-rich mix.
- Coconut Coir – 1 brick (rehydrates to 0.33 cu ft)
- Compost (sifted & sterilized ) – 12 cups
- Vermiculite – 3 cups
- Sand (rough builder) – 3 cups
- Garden Tone fertilizer – 2 TBS
- Wood Ash – 2 TBS
- Limestone (ground) – 1 TBS
For transplanting the seedlings into 6-packs and small pots, we shift the mix closer to fertile garden soil by increasing the compost and nutrients.
- Coconut Coir – 1 brick (expands to 0.33 cu ft rehydrated)
- Compost (sifted & sterilized ) – 24 cups
- Vermiculite – 3 cups
- Sand (rough builder) – 3 cups
- Garden Tone fertilizer – 4 TBS
- Wood Ash – 4 TBS
- Limestone (ground) – 2 TBS
About the ingredients:
The coir is made from ground coconut shells, and is a pH-neutral, sustainable alternative to peat moss.
The compost is all vegetable-matter based, from a home compost pile and from the ones at the main garden.
The Garden Tone organic fertilizer is rated at 3-4-4. For our eggplant, pepper and tomato seedlings, we often substitute Tomato Tone.
The wood ash is collected from a home fireplace, sifted to remove charcoal chunks.
The limestone buffers the pH of the compost. We use pure ground limestone. (Our garden soil tests high for magnesium, so we’re wary of adding more.)
