Growing Container Evergreens for a Tree Farm: Soil, Fertilizer & Irrigation Tips

A tree farm in Heber City, Utah grows evergreens in containers placed in ground holes for later harvest. Uses double‑potting with gravel. Asks about soil prep, fertilizers, and sprinkler irrigation.

Soil Mix for Long‑Term Container Trees

• Bulk mix: 50% screened composted bark, 30% peat/coir, 20% pumice/perlite. Adjust pH to 5.5‑6.5 for conifers.
• Add per container: Osmocote 18‑6‑12 (8‑9 month) at label rate + water‑holding polymer (e.g., Soil Moist) at 1‑2 lbs/cu yd.
• Source locally: Bulk soil yards save 50%+ vs. bags.

Drainage & Double‑Potting

• Gravel at bottom of outer pot is good.
• Ensure inner pot has ample drainage holes.
• Check: water should drain freely in < 2 minutes.
• Never let containers sit in standing water.

Irrigation: Sprinkler Concerns

• Wet foliage = disease risk (needle cast, blight).
• Sunburn: Water droplets act as lenses.
• Solution: Convert to drip irrigation or micro‑spray at soil level. If sprinkler is mandatory, run early morning only, and ensure rapid drying.

Watering Schedule

• Check moisture daily in heat. Water when top 2‑3" dry.
• Deep soak to bottom of container.
• Allow oxygen return between waterings—don't keep saturated.

Monitoring

• Inspect monthly for pests (spider mites, aphids), disease, root circling.
• Root prune / up‑pot every 2‑3 years.
• Foliar feed with kelp/fish emulsion monthly during growth.

Quality soil, targeted irrigation, and proactive monitoring produce premium container‑grown evergreens.