Greenhouse Gardening: Controlled Environment, Year-Round Harvests

A greenhouse lets you garden in any season by managing temperature, humidity, and light. The principles mirror outdoor gardening, but the enclosed space demands attention to climate control.

Site and Orientation

Place the structure where it captures maximum sun year-round—ideally southeast to southwest exposure. This is critical in spring and fall when the sun sits low.

Temperature and Ventilation

Plants prefer cooler, more humid air than typical indoor conditions. Vent daily: open doors in morning, close by late afternoon (watch for frost). On hot days, hose the floor and open roof vents for rapid cooling.

Soil and Containers

Use a well-draining mix (fir bark, sand, peat, vermiculite, perlite). Grow in deep tray beds rather than individual pots for better root run and moisture stability.

Watering Wisdom

Avoid overwatering; a climate-controlled greenhouse self-regulates humidity. Water at soil level to keep foliage dry and reduce disease.

Crop Ideas

Root vegetables (carrots, beets) in deep boxes under benches. Leafy greens in tubs. Vining crops (peas, cucumbers, tomatoes) in large containers with supports.

With imagination and a little climate management, your greenhouse becomes a four-season produce aisle.