Indoor Seed Starting Masterclass: Sterile Mix Recipe, Bottom Watering & Grow Light Distance
Author: Wara Danish, MSc | Horticultural Review: Certified Agronomy | Last Updated: October 2026 Precision seedling propagation: Maintaining optimal LED grow light distance and humidity dome removal for stocky indoor seedlings. To start seeds indoors successfully, sow into a sterile mix of 40% peat, 40% vermiculite, and 20% perlite. Remove humidity domes at first emergence, suspend full-spectrum LED grow lights 3 to 4 inches above the canopy for 16 hours daily, and water exclusively from below to prevent damping-off. Substrate Formula 40 Peat / 40 Verm / 20 Perl LED Light Distance 3 – 4 Inches Above Canopy Daily Photoperiod 16 Hours Light / 8 Dark Watering Method 100% Sub-Irrigation…