Container Vegetable Gardening: Seeds, Soil, and Success Strategies

Fresh seed (90%+ germination) planted at correct depth in quality organic mix is the foundation of container success.

Seed Economics

• 1 packet per variety typically suffices for 30 containers.
• Over-sow 20–30%; thin to strongest.
• Share/trade extras with other gardeners.
• Don't buy bulk—viability drops yearly.

Optimal Container Mix (DIY or Bulk)

Recipe: 1/3 compost, 1/3 peat/coco coir, 1/3 perlite/vermiculite + slow-release organic fertilizer (5-5-5 or tomato-specific).

Why not garden soil: Compacts, drains poorly, brings weeds/disease.

Why not pure potting soil: Often peat-heavy, low nutrition, shrinks.

Germination Keys

• Depth = seed diameter (most ¼ inch or less).
• Consistent moisture—cover with dome/plastic until emergence.
• Warmth: 70–80°F for most vegetables.
• Light immediately upon emergence (prevents legginess).

30-Container Crop Plan (Example)

• 8 tomatoes (determinate, 5-gal+)
• 6 peppers (3-gal+)
• 4 bush beans (2-gal)
• 4 lettuce/greens (shallow, succession)
• 3 herbs (basil, parsley, cilantro)
• 2 cucumbers (trellised, 5-gal)
• 2 eggplant (5-gal)
• 1 cantaloupe (trellised, 10-gal)

Ongoing Care

Daily moisture check. Weekly liquid feed (fish/kelp). Mulch all containers. Stake/trellis at planting.