A greenhouse opens up a world of possibilities—starting seeds earlier, growing tropical plants, and harvesting fresh vegetables even in winter. Here's how to make the most of your greenhouse.
Greenhouse Benefits
- Start seeds 6-8 weeks earlier
- Grow heat-loving crops in cool climates
- Harvest greens through winter
- Protect plants from weather extremes
- Control growing environment
- Overwinter tender perennials
Choosing a Greenhouse Type
By Structure
- Attached (lean-to): Shares wall with building, efficient heating
- Freestanding: More light, flexible placement
- Hoop house: Affordable, easy to build, less durable
- Geodesic dome: Strong, energy-efficient, unique look
By Covering
- Glass: Beautiful, durable, expensive, heavy
- Polycarbonate: Lightweight, good insulation, long-lasting
- Polyethylene film: Cheap, easy, replace every 2-4 years
🌡️ Size Matters
Bigger is easier to manage! Small greenhouses have extreme temperature swings. An 8x12 foot greenhouse is the minimum practical size for most growers.
Siting Your Greenhouse
- Orientation: Long axis east-west for maximum winter sun
- Sun: Full sun, especially in winter months
- Wind: Sheltered from prevailing winds
- Access: Close to house for frequent visits, utilities
- Drainage: Level site with good drainage
Temperature Management
Heating Options
- Electric heaters: Clean, easy, can be expensive
- Propane/natural gas: Efficient for larger structures
- Thermal mass: Water barrels store daytime heat
- Hot water/compost: Sustainable alternatives
Cooling Methods
- Ventilation: Roof and side vents essential
- Exhaust fans: Active ventilation for hot days
- Shade cloth: 30-50% shade in summer
- Evaporative cooling: Wet pads for dry climates
What to Grow
Winter (Cool Season)
- Lettuce and salad greens
- Spinach, kale, chard
- Carrots, beets, radishes
- Herbs (parsley, cilantro, chives)
- Asian greens
Spring (Seed Starting)
- Tomatoes, peppers, eggplant
- Squash, cucumbers, melons
- Flowers for transplanting
Summer (Heat Lovers)
- Tomatoes (indeterminate for long harvest)
- Peppers and eggplant
- Cucumbers on trellises
- Basil and tender herbs
Essential Equipment
- Thermometer (min/max recording)
- Watering system (drip or overhead)
- Benches or shelving
- Potting area
- Storage for supplies
- Automatic vent openers (temperature-activated)
Pest and Disease Prevention
- Inspect plants before bringing inside
- Maintain good air circulation
- Avoid overwatering
- Remove dead plant material promptly
- Use beneficial insects for pest control
- Clean greenhouse thoroughly between seasons
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