Oak from Acorns: Complete Indoor Start Protocol

Northern Minnesota short season demands indoor acorn start. 1000-hour cold stratification (32-35°F), then progressive container culture.

Stratification & Germination

1. Acorns in damp peat/leaf mold, fridge 32-35°F
2. 1000+ hours cold (whites: 36-39°F)
3. Plant April 15-20 in 8oz cups, horizontal, ½" deep
4. Peat/sphagnum mix, south window, constant moisture

Progressive Container Schedule

• 3 weeks: 5-6" stalk, first leaves → harden off mid-May
• Late May: Transplant to 16oz cups, check taproot
• Second flush: Transplant to 32oz tall containers
• 10-12" tall: Plant permanent site

Overwintering Seedlings

• Garage/porch/basement 5-45°F (20-30°F ideal)
• 1000-1500 hours cold
• Never below 0°F at roots
• Barely damp all winter

Mild Miracle-Gro after first transplant. Your early start produces field-ready seedlings for spring planting.