🪱 Growing Foundation
Soil Preparation Guide
Build healthy soil and everything else becomes easier
Healthy soil is the single most important factor in a productive garden. You can have perfect sunlight, the right seeds, and consistent watering — but poor soil will undermine everything.
This guide covers everything a US home grower needs to know about choosing, building, and maintaining the right growing medium — whether you're gardening in containers, raised beds, or directly in the ground.
Why Soil Quality Changes Everything
Plants absorb water, nutrients, and oxygen through their roots. If the soil is too dense, too sandy, too acidic, or lacking nutrients, root development suffers — and so does everything above ground.
Choosing the Right Soil for Pots & Containers
If you're growing in pots, fabric bags, or raised planters — never use garden soil. It compacts heavily in containers, restricts drainage, and can introduce pests and diseases.
✅ Best Options for Containers
Specifically formulated for containers. Light, well-draining, pre-fertilized. The easiest choice for beginners.
Made from coconut husks. Excellent moisture retention with good drainage. Environmentally sustainable and pH-neutral.
Adding 20–30% perlite to potting mix dramatically improves drainage and aeration — great for herbs that prefer drier conditions.
❌ Avoid in Containers
Too heavy, compacts in pots, drains poorly. Not suitable for container growing.
Too rich and dense when used alone. Mix it in (20–30%) rather than filling containers with it entirely.
Old mix depletes nutrients and can harbour disease. Refresh or replace between seasons.
Building the Perfect Raised Bed Mix
Raised beds give you complete control over your growing medium. The classic formula used by experienced home growers is sometimes called the "Mel's Mix" or a variation of it — though any quality blend following these ratios works well.
Recommended Raised Bed Mix Formula
This blend drains well, retains moisture, and provides excellent nutrient density. Adjust ratios based on your plant types — herbs prefer faster drainage, vegetables need more moisture retention.
Lean mix — less compost, more perlite. Most herbs (lavender, rosemary, thyme) prefer drier, less fertile soil.
Richer mix — higher compost ratio. Tomatoes, squash, and peppers are heavy feeders and need nutrient-dense soil.
Balanced mix. Lettuce, spinach, and kale prefer consistent moisture — add extra coco coir for water retention.
Neutral, free-draining. Chamomile, echinacea, and calendula do best in well-draining soil with moderate organic content.
Understanding pH — and Why It Matters
Soil pH determines which nutrients are available to your plants. Even nutrient-rich soil becomes "locked out" at wrong pH levels — the plant simply can't absorb what it needs.
Blueberries, azaleas. Not suitable for most vegetables and herbs.
Tomatoes, basil, mint, echinacea, lettuce, spinach — the sweet spot for home growing.
Most vegetables struggle here. Nutrients like iron and manganese become unavailable.
How to Adjust pH
Feeding & Maintaining Your Soil Over Time
Container soil depletes nutrients quickly — especially after regular watering leaches minerals out through drainage holes. A simple feeding routine keeps plants productive all season.