Seed Starting Mix
Starting seeds is one of the most rewarding parts of gardening, but success hinges on having the right seed starting mix. Many commercial seed starting mixes are designed to encourage germination but often lack the nutrients seedlings need as they grow. That’s why I developed my own blend—a simple, affordable mix that started as my go-to for microgreens and has evolved into my trusted mix for seedlings.
Don’t get me wrong: there are some excellent organic seed starting mixes available on the market. Many of them are well-balanced and high-quality, but they can also be quite pricey, especially if you’re starting a lot of seeds. This DIY mix has worked so well for me that I stick with it, knowing I’m giving my seedlings everything they need while keeping costs low.
Ingredients and Their Roles
1. Peat Moss
• Retains moisture and creates a light texture for delicate roots.
2. Coconut Coir
• A renewable alternative to peat moss, coconut coir improves aeration and holds water without compacting.
3. Perlite
• Enhances drainage and keeps the mix light and airy to prevent root rot.
4. Vermicompost
• Adds essential organic nutrients and beneficial microbes to nourish seedlings once they sprout and outgrow the stored energy in their seeds.
5. Azomite (Rock Dust)
• Provides trace minerals that support overall plant health, giving your seedlings a boost for strong, vigorous growth.
Seed Starting Mix Recipe
This recipe started as my go-to for growing microgreens but has become my all-purpose mix for seedlings. It’s affordable, easy to make, and packed with nutrients to support early growth.
Ratios (By Volume)
• 4 parts peat moss
• 1 part coconut coir
• 1.5 parts perlite
• 1 part vermicompost
• 2 tablespoons azomite per gallon of mix
Step-by-Step Instructions
1. Prepare Your Workspace
• Choose a clean surface or a large container for mixing. (I use a plastic tote with a lid so that I can store the mix.)
2. Measure Your Ingredients
• Use simple tools like measuring cups, buckets, or scoops to maintain consistent ratios.
3. Mix Thoroughly
• Combine peat moss (and/or coconut coir) with perlite first to ensure proper aeration. Then mix in vermicompost and azomite until evenly distributed.
4. Moisten the Mix
• Add water gradually, mixing as you go. The mixture should feel damp but not soggy—it should hold together when squeezed and crumble easily when disturbed.
Why I Use This Mix for Microgreens and Seedlings
When I first started growing microgreens, I needed a lightweight, moisture-retentive mix that wouldn’t compact or waterlog. The combination of peat moss, coconut coir, and perlite was perfect. As I began using this mix for seedlings, I noticed that many commercial seed starting mixes were great for germination but lacked the nutrients seedlings need after they sprout.
Seedlings rely on the stored energy in their seeds during the first stage of growth, but they quickly outgrow that limited supply. This is why I started adding vermicompost and azomite. Vermicompost provides a slow, steady release of nutrients, while azomite supplies trace minerals that help plants develop strong roots and healthy leaves. This makes the mix perfect for sustaining seedlings through their critical early growth stages.
Benefits of This Affordable Mix
1. Nutrient-Packed: Many seed starting mixes don’t contain added nutrients, but this DIY blend feeds your seedlings as soon as they need it.
2. Versatile: Whether you’re growing microgreens, vegetables, or flowers, this mix gives your plants a strong foundation.
3. Cost-Effective: While organic seed starting mixes are convenient, they can be expensive. This DIY option is budget-friendly and just as effective.
4. Sustainable Options: By incorporating coconut coir as a peat moss alternative, you can reduce your environmental impact.
Tips for Success
• Sterilize Your Mix (Optional): If you’re worried about pathogens, bake the mix at 180°F for 30 minutes before adding vermicompost and azomite.
• Storage: Keep any unused mix in an airtight container to maintain freshness.
• Customize for Specific Plants: Adjust the vermicompost ratio slightly if you’re growing plants that need more or less nutrition.
This mix has become my go-to for starting seeds and growing microgreens because it’s reliable, affordable, and easy to make. By combining moisture retention, good drainage, and essential nutrients, it ensures my seedlings grow strong and healthy without the need for pricey store-bought alternatives.
If you’re looking for a DIY seed starting mix that checks all the boxes, give this one a try. Your seedlings—and your wallet—will thank you!
Happy growing!
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