The Best DIY Seed Starting Mix

4 Materials
$30
1 Hour
Easy

Spring is on the way and it’s almost time to start seedlings. I’ve been experimenting for over 6 years and I’ve created The Best DIY Seed Starting Mix, well at least in my opinion. This mix performs so well that I just had to share it with you.
the best diy seed starting mix
I use a blend of a few store-bought mediums to create my seedling mix. The reason that I use store bought ingredients is because I know the products are of a consistent quality and have been heat-treated to ensure the mediums do not contain fungus, insects, weed seeds etc.

Trust me, when you spend as much money on seeds each year as I do, you want to protect your investment and ensure your seeds get off to the best start possible.
the best diy seed starting mix
Each of us will have different volume requirements if you are just doing one tray at a time use these ratios:

4.5 cups Potting Soil

4.5 cups Seedling Mix

1 cup Worm Castings

1 tsp  Green Sand or other all-natural mineral amendment

1 cup Water to moisten the mix as you go.
the best diy seed starting mix
Thoroughly blend your ingredients in a bucket, adding water 1/4 cup at a time to keep the dust down and to moisten the soil for the seedlings.
the best diy seed starting mix
Fill your seedling trays with the soil mix and gently press the soil into the cells. Do not pack the soil in, we want the soil to stay light and fluffy, so use very gentle pressure.

Plant your seeds as directed on the seed packet, and stand back! This soil blend really works!

For more info and a detailed breakdown on why I chose these ingredients see my full article here:

Suggested materials:

  • Promix Brand Indoor Potting Soil  (Amazon)
  • Promix Brand Seed Starting Mix  (Amazon)
  • Espoma Brand Earthworm Castings  (Amazon)
See all materials
Jana The Hip Homestead

Want more details about this and other DIY projects? Check out my blog post!

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