Potting Soil Calculator

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Angelina Everly

Potting Soil Calculator
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🪴 Potting Soil Mix Calculator

Create custom potting soil mixes for different plant types. Standard potting mix typically contains peat/coco coir (40-50%), compost (20-30%), perlite/vermiculite (20-30%), and bark or other amendments (10-20%). Adjust ratios based on plant needs.

Custom Potting Mix Calculator

🌱 General Purpose

All-around mix for most plants

🌾 Seed Starting

Fine, sterile mix for seeds

🌵 Succulent/Cactus

Fast-draining mix

🌺 Orchid Mix

Bark-based with drainage

Mix Components (%)

Peat Moss / Coco Coir 40%
Compost / Humus 30%
Perlite / Vermiculite 20%
Bark / Coconut Husk 10%
Total Mix: 100%

Potting Mix Recipes

🌱 General Purpose Mix

For: Most houseplants, vegetables

  • 40% Peat moss or coco coir
  • 30% Compost
  • 20% Perlite
  • 10% Bark or vermiculite

Features: Balanced drainage and retention, nutrient-rich

🌾 Seed Starting Mix

For: Seeds and cuttings

  • 50% Peat moss or coco coir
  • 0% Compost (sterile mix)
  • 30% Vermiculite
  • 20% Perlite

Features: Fine texture, sterile, excellent moisture retention

🌵 Succulent/Cactus Mix

For: Succulents, cacti, jade plants

  • 30% Peat moss or coco coir
  • 20% Compost
  • 40% Perlite or pumice
  • 10% Coarse sand

Features: Fast drainage, prevents root rot

🌺 Orchid Mix

For: Phalaenopsis, cattleya orchids

  • 0% Peat moss
  • 0% Compost
  • 20% Perlite or charcoal
  • 80% Bark chips (medium grade)

Features: Excellent air circulation, chunky texture

🌿 African Violet Mix

For: African violets, gesneriads

  • 50% Peat moss
  • 20% Compost
  • 25% Perlite
  • 5% Vermiculite

Features: Light, airy, slightly acidic

🥬 Raised Bed Mix

For: Raised garden beds

  • 30% Peat moss or coco coir
  • 40% Compost
  • 20% Perlite
  • 10% Topsoil or garden soil

Features: Nutrient-dense, supports heavy feeders

Potting Soil Component Guide

🌾 Peat Moss

Purpose: Water retention, acidity

Pros:

  • Excellent water retention
  • Lightweight and sterile
  • Lowers pH (acidic)
  • Long-lasting

Cons:

  • Not renewable resource
  • Difficult to rewet when dry
  • Low nutrient content

🥥 Coco Coir

Purpose: Sustainable peat alternative

Pros:

  • Renewable resource
  • Good water retention
  • Rehydrates easily
  • pH neutral

Cons:

  • May contain salts (rinse first)
  • Breaks down faster than peat
  • Can be expensive

🌱 Compost

Purpose: Nutrients, beneficial microbes

Pros:

  • Rich in nutrients
  • Improves soil structure
  • Adds beneficial microbes
  • Sustainable and free (homemade)

Cons:

  • Can be heavy when wet
  • Quality varies
  • May contain weed seeds

⚪ Perlite

Purpose: Drainage, aeration

Pros:

  • Excellent drainage
  • Lightweight
  • Sterile and pH neutral
  • Doesn’t decompose

Cons:

  • Creates dust when dry
  • Floats to surface
  • Non-renewable mineral

🟤 Vermiculite

Purpose: Water retention, aeration

Pros:

  • Holds water and nutrients
  • Improves aeration
  • Sterile and lightweight
  • pH neutral

Cons:

  • Compacts over time
  • Can hold too much water
  • Non-renewable

🪵 Bark/Wood Chips

Purpose: Drainage, structure

Pros:

  • Excellent drainage
  • Prevents compaction
  • Long-lasting
  • Renewable resource

Cons:

  • Can tie up nitrogen
  • Takes time to decompose
  • Quality varies by type

💡 Mixing Tips

  • ✓ Mix components thoroughly when dry for even distribution
  • ✓ Pre-moisten peat moss or coco coir before mixing
  • ✓ Wear a dust mask when working with dry perlite
  • ✓ Store unused mix in sealed containers or bags
  • ✓ Sterilize homemade compost before use (heat to 160°F)
  • ✓ Add slow-release fertilizer if using low-nutrient mix

User Guide for Potting Soil Calculator

What it does:
This calculator helps you determine the optimal mix and quantities for making potting soil based on components like peat, compost, perlite, and bark. It supports multiple mix ratios for different plant types.

How to use:

  1. Select preset mix ratios for seed starting, houseplants, succulents, or custom blends.
  2. Input the total volume needed in cubic feet, gallons, or liters.
  3. Adjust component percentages if allowed, to tailor the mix for your plants.
  4. Calculate the amounts of each component required.
  5. Review the detailed breakdown and instructions for mixing.
  6. Use the guide section for tips on mixing, storing, and applying potting soil.

Tips:

  • Use adequate drainage materials for succulents and cacti (higher perlite).
  • Add compost for nutrient-rich houseplant mixes.
  • Adjust peat and bark proportions to modify water retention and aeration.
  • Make in small batches initially to test plant response.
  • Store unused mix in sealed containers or bags.

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