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Make Your Own Seed Starting Mix | DIY Gardening

Make Your Own Seed Starting Mix | DIY Gardening

Give your seedlings a headstart and make your own seed starting mix.

Your next bumper crop is right around the corner, waiting in a handful of seeds. If only all the seeds we planted grew past that awkward stage from youth to adolescence and into prosperous and fruitful adults. A bit of magic to guarantee success perhaps? Or just the right formula of sun, water, air, and a good seed starting mix?

Here are the basics:

  • Start with the seed packet. It provides the optimal conditions for the variety at hand.
  • Choose your growing location wisely. Sun is key but so too is a protected space.
  • Water, it can be tricky to figure out, especially because the usual thinking is if a little is good then more is better. Not so with seeds. The soil needs to be damp but not waterlogged. Overwatering can be just as detrimental as too little water. See 8 Tips to Prevent Damping-Off of Seedlings for more ideas.
  • Finally, soil. The general rule of thumb is to start seeds in light soil, nothing too rich or heavy in fertilizers. Seeds have everything they need inside them to get started, so choose a mix designed for planting or make your own, like I am here.

I’ve chucked plenty of seeds into an organic planting mix or straight into the garden with great success. But there are some seeds I treat with greater consideration. Either because I’m counting on them more, I can’t live without them and their growing season is so particular I don’t want to miss it, like tomatoes. Or because they tend to be more susceptible to issues such as damping-off, like lettuces. In that case, a soil-less mix does the trick.

But finding a soil-less mix without peat is a challenge. In fact, it can be nearly impossible. And the excavation of peat bogs, systems that take centuries to form with huge benefits to the environment, is something I can’t support. The stakes are too high. So, I don’t buy products containing peat. Coconut coir is a fabulous alternative and a natural byproduct of the coconut industry. Plus its pH neutral whereas peat is acidic, affecting the balance of your soil and the ability of plants to take in nutrients.

So, I make my own soil-less mix. The benefits far outweigh the time it takes to put it together which, as you can see, is only a matter of minutes. Not only can you make a peat-free product but you can craft it how you’d like, modifying the recipe as you would when cooking. Plus you can make the amount you need, not too much or too little, and it’s cost effective.

Soil-less Seed Starting Mix Recipe

  • 8 parts hydrated coir
  • 3 part worm castings
  • 4 parts perlite

Hydrate coir in a container of water for 30 minutes. The brick will come apart and become flaky, like compost. Once it’s hydrated mix coir, worm castings, and perlite together. If it’s too clumpy and doesn’t crumble, add more perlite. Or vice versa, if it’s overly crumbly add more coir.

*Note: store-bought and homegrown worm castings can be quite different, which can also affect the consistency of your mix.

For tips on how to grow your garden from seed watch How to Grow Greens from Seed and for transplanting tricks watch How to Transplant Seedlings.

Other articles you might enjoy:

6 Solutions for Successful Container Gardening

Grow Your Own Herb Tea Garden

How to Grow Rosemary From Cuttings

This article was originally published in May of 2015.

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About the Author: Emily Murphy

I’ve learned there’s something wonderfully powerful in the simple act of growing. Here, in our gardens, we can repair ourselves and our plots of earth with our own two hands. GROW WHAT YOU LOVE and GROW NOW!

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  1. Regina June 1, 2015 at 8:21 am - Reply

    I made a typo in my comment . My succulent mix I put together is peat free.. Which was not easy finding the ingredients…
    Thanks again !!!

  2. Regina June 1, 2015 at 8:18 am - Reply

    Hi Emily,
    I just watched your segment on Goodday Sacramento…
    And boy am I happy I did!!!
    I read through a bit of your site and I agree a thousand percent with you on the subject of the peat moss. Not only for the environmental issue but also in my novice opinion it attracts the most unpleasant pests. I do grow succulents and I am about to plant a raised bed of tomatoes some various vegetables and a few herbs. I did make my own soil mix for my succulents which they seem to love, that is free but I’m wondering if you have any recommendations as far as a raised bed mix that I could put together. Thank you for the GoodDay segment it was very informative I’m definitely going to use some of the watering techniques. I look forward to reading through the rest of your website. !!!!

    • Emily Murphy June 10, 2015 at 2:41 pm - Reply

      Thank you, Regina! I’m so happy you could see the Good Day Sacramento segment and found it helpful! That makes my day! Thanks for taking the time. As far as a soil mix for raised beds, if you’re starting from scratch, use a top soil/compost mix. It can be 50/50, 40/60 or even 30/70. I think 40/60 is nice (soil/compost). You should be able to find a supplier that makes and even delivers a pre-made organic mix. Ready to go — which is super helpful. Are you in the Sacramento area? I know of a supplier in Auburn but there must be plenty of others. Let me know how it goes. Thanks again! Emily

  3. Jen Hibbits March 12, 2015 at 3:27 pm - Reply

    Always love your videos, but the first thing I thought of is, “Oh my goodness she’s playing in the dirt in light colored jeans!!!” I love getting dirty, believe me, but I can’t help but brush my hands off on my jeans!

    • Emily Murphy March 12, 2015 at 3:58 pm - Reply

      Ha! Right, those jeans. I always wipe my hands on them too! Never let your clothes get in the way of planting & growing. Cleanliness is overrated. :)