Growing Seeds in Containers

Tips for successfully growing plants from seeds in pots, planters and containers.

Why Grow in Containers?

Container growing offers flexibility for gardeners with limited space, poor soil, or challenging climates. It is ideal for patio gardens, balconies, and for starting plants that will later be transplanted outdoors.

Choosing Containers

  • Size: Minimum 8 inches deep for most plants, 12+ inches for trees and shrubs
  • Drainage: Essential ΓÇö containers must have drainage holes
  • Material: Plastic retains moisture, terracotta breathes, fabric bags are lightweight
  • Color: Dark pots absorb heat ΓÇö good in cool climates, bad in hot ones

Container Growing Medium

Do not use garden soil in containers ΓÇö it compacts and drains poorly. Use:

  • Seed-starting mix: For germination (fine texture, low nutrients)
  • Potting mix: For growing on (includes perlite, peat, compost)
  • Custom blend: 60% potting mix + 30% perlite + 10% compost

Planting in Containers

  1. Fill containers: Leave 1 inch of space at the top for watering
  2. Moisten soil: Water until evenly damp before planting
  3. Plant seeds: Follow depth guidelines for each species
  4. Label: Use waterproof labels or tags
  5. Water gently: Use spray bottle or watering can with rose
  6. Cover: Use plastic wrap or humidity dome until germination

Watering Containers

  • Check daily: Containers dry out faster than garden beds
  • Water deeply: Until water runs from drainage holes
  • Bottom watering: Place pot in saucer of water for 30 minutes
  • Morning is best: Allows foliage to dry before evening
  • Mulch surface: Reduces evaporation

Fertilizing

Container plants need regular feeding since nutrients leach out with watering:

  • Seedlings: Wait until true leaves appear, then dilute liquid fertilizer
  • Established plants: Feed every 2-4 weeks during growing season
  • Trees and shrubs: Slow-release fertilizer in spring

Winter Protection

Containers offer less insulation than ground soil. In cold climates:

  • Move pots to sheltered location near house wall
  • Group pots together for mutual insulation
  • Wrap containers with bubble wrap or burlap
  • Water occasionally ΓÇö soil should not freeze completely dry
  • Consider bringing tender plants indoors

Applies to