If you’re planting seeds in a greenhouse, here are 3 tips most beginners don’t hear: 1. Don’t keep the greenhouse too warm. Seeds love warmth to germinate, but once they sprout, too much heat makes seedlings grow tall, weak, and leggy. Cooler air strong light = stronger plants. 2. Airflow matters more than you think. Still air in a greenhouse can cause damping off, mold, and weak stems. A small fan or opening the door during the day makes a huge difference. 3. Water from the bottom whenever poss