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4 Comments

Homemade Seed Starting Soil Mixes

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Homemade Soil Mixes Homemade seed starting soil mixes are an easy way to get your garden going fast.

Why Use Homemade Seed Starting Mixes?

Starting your own garden transplants from seed is smart because it gets you a big-time boost in harvesting vegetables from the garden. Plus, you can grow and try whatever variety you want rather than depending on varieties that the garden center might have. But, if you’re using prepackaged bags of seed starting mix from the store, it can get expensive quick.

The good news is, it’s easy to make your own homemade seed starting soil mixes with just a few ingredients from the garden center. We’ve been using both recipes below for making “soil blocks” to germinate seeds and grow transplants (see Use Soil Blocks for Super Healthy Seedlings), and find that these recipes germinate seeds as well or better than the mixes we used to get from the store.

tomato seedlings in soil blocks

tomato seedlings in soil blocks

Although we use both recipes for soil blocks (the first for 2″ and larger soil blocks and the second for 3/4″ soil blocks), the first recipe also works well for starting transplants in containers. Both recipes are from The New Organic Grower by Elliot Colem

Soil Mix for 2" Soil Blocks or Transplants

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Ingredients
  

  • 3 buckets (10 quart bucket) brown peat
  • 1/2 cup lime
  • 2 buckets coarse sand
  • 1 cup blood meal
  • 1 cup colloidal phosphate (22%)
  • 1 cup greensand
  • 1 bucket soil
  • 2 buckets compost

Notes

To make the seed starting mix, measure the peat into a large mixing container, add the lime and mix. Then add the sand, blood meal, phosphate, and greensand – mix again. Add the soil and compost, mix again. It’s a good idea to start out with good quality peat that doesn’t have large pieces in it, otherwise the mix needs to be screened (I found this out the hard way). The recipe makes about 2 bushels of mix and can be used for “soil blocks” or starting seedlings in containers.
Tried this recipe?Let us know how it was!

For the very smallest “soil blocks” (3/4″ soil blocks) a different recipe is used that isn’t as rich.

Soil Mix for 3/4" Blocks

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Ingredients
  

  • 4 gallons peat
  • 1 cup colloidal phosphate
  • 1 cup greensand
  • 1 gallon compost

Instructions
 

  • Mix all ingredients together similar to the recipe above.
Tried this recipe?Let us know how it was!

Soil Mix Collage

Related posts:

Use Soil Blocks to Grow Super Healthy Seedlings
Pre-sprouting & Cutting Seed Potatoes
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Filed Under: Starting Plants

About Lesa

Lesa Wilke is a homesteader and freelance writer who loves to inspire others on their journey to more sustainable lifestyles. She accomplishes this by sharing the skills she’s learned (plus support, advice & tips) while farming goats, chickens, honeybees, and produce.

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Comments

  1. Wayne Larson says

    April 7, 2021 at 8:37 pm

    I love using soil blocks, but I have experienced quite a bit of damping off. Do you have any suggestions for preventing damping of using the 2” mix? I do bottom water and water sparingly.

    Reply

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