Building a Small Greenhouse
A small greenhouse can extend the growing season and create a protected space for seedlings.
But in Alabama, ventilation is just as important as warmth.
Decide the Purpose
Will you use it for:
- Seed starting
- Winter greens
- Frost protection
- Overwintering plants
- Propagation
The purpose determines the design.
Choose the Site
Look for:
- Winter sun
- Good drainage
- Easy water access
- Protection from strong wind
Frame Options
Common materials include:
- Wood
- PVC
- Metal hoops
Covering
Options include:
- Greenhouse plastic
- Polycarbonate panels
- Reclaimed windows
Use materials designed for outdoor exposure.
Ventilation Is Critical
A greenhouse can overheat on a sunny winter day.
Include:
- Doors
- Roof vents
- Side vents
- Fans if needed
Anchor the Structure
Southern storms can damage lightweight greenhouses.
Secure:
- Base
- Frame
- Covering
well.
Flooring
Options include:
- Gravel
- Landscape fabric
- Pavers
Avoid creating standing water.
Watering
Plan a hose or irrigation source.
Shade in Warm Weather
Greenhouses can become dangerously hot by late spring.
Use shade cloth if the structure remains in use during warmer months.
GardenGrowz Tip
In Alabama, a greenhouse is usually easier to heat than it is to keep cool.