Growing in a 15×20 footprint offers ample space for seedlings, propagations, and small beds while remaining manageable for most backyards. This guide reviews five reliable greenhouse coverings and enclosures that fit a 15×20 setup, focusing on durability, weather resistance, and microclimate control. Each option includes UV protection, wind resistance, and easy installation features to help gardeners maximize yield and extend the growing season.
Summary of selected products:
- 18 Mil Greenhouse Cover by ZSLTLDU Store—heavy-duty, waterproof, UV-treated tarp with reinforced edges.
- BPS Greenhouse Replacement Cover 20′ x 10′ x 7’—durable, insulated plastic with reinforced seams for harsh weather.
- 20 x 20 FT Shade Cloth by QLOFEI Store—high-quality shade solution with built-in grommets for easy hanging.
- 20 Ft x 30 Ft Clear Greenhouse Plastic Covering—16 mil thick, heavy-duty, with hemmed edges and preinstalled grommets.
- 6 mil Greenhouse Plastic Sheeting—20 x 25 ft, multi-layer film, UV resistant with anti-drip surface.
18 Mil Greenhouse Cover, Heavy-Duty Tarp
The 18 Mil Greenhouse Cover from ZSLTLDU Store combines robustness with weather resistance. It is made from double-layer woven polyethylene designed to resist punctures, providing cold, rain, wind, and dust protection. The UV inhibitors help slow aging from sun exposure, extending tarp life across seasons. A reinforced anti-tear design uses rust-resistant grommets and sturdy rope hems to maintain edge integrity in windy conditions. This cover is suitable for covering greenhouse frames where durability and long service life matter most.
Key points:
- Heavy-duty, waterproof construction for reliable protection.
- UV-resistant to prevent premature degradation.
- Reinforced edges and grommets for secure anchoring.
BPS Greenhouse Replacement Cover 20′ x 10′ x 7′
The BPS replacement cover is designed to fit large walk-in shelters, offering 140 GSM PE material with waterproof, UV-resistant, and insulated properties. This cover protects plants from summer sun and helps retain warmth in cooler months, contributing to a stable microclimate inside the greenhouse. Its tear-resistant design features double-stitched and reinforced seams to withstand hail, wind-driven debris, and severe weather. Users can close roll-up doors and windows to regulate humidity and temperature, enhancing overall plant health.
Key points:
- Durable, UV-protected polyethylene with insulation properties.
- Reinforced seams for better tear resistance.
- Controls microclimate via sealed access points and vents.
20 x 20 Shade Cloth for Plants
The 20 x 20 shade cloth by QLOFEI Store provides 40% shade, reducing sun intensity while maintaining airflow. The material is high-density polyethylene—lightweight yet durable—designed for maximum ventilation. It suits greenhouses, hoop structures, and outdoor shelters, offering versatility for plant protection, cooling, or windbreaks. Lock-stitch knitting minimizes unraveling, and reinforced corners with grommets every 40 inches enable secure hanging and quick setup. This option helps prevent heat stress during peak sun hours.
Key points:
- 40% sunblock for cooling and light diffusion.
- Durable, breathable PE material with grommets for easy mounting.
- Knit with reinforced corners to resist tearing.
20Ftx30Ft Clear Greenhouse Plastic Covering
This 20×30 foot clear greenhouse plastic covering uses 16 mil thickness, delivering heavy-duty protection against wind and severe weather. The transparent material allows bright, diffuse light to reach plants, promoting healthy growth while keeping moisture balanced. Reinforced strings inside the plastic and hemmed edges increase durability and resistance to tearing under tension. This cover is suited for larger greenhouse frames and high-need cultivation areas where light transmission is essential.
Key points:
- 16 mil thickness for enhanced durability.
- Clear, diffuse light transmission supports plant growth.
- Hemmed edges with internal reinforcement for strength.
6 mil Greenhouse Plastic Sheeting
The 6 mil greenhouse plastic sheeting offers a balance of flexibility and strength, with a 20×25 ft footprint. It uses five-layer co-extrusion to deliver high mechanical strength and UV resistance, helping protect plants from sun and high temperatures. The material includes a hydrophobic, anti-drip surface to minimize water droplets that can cause leaf damage. This option is suitable for budget-conscious setups that still require durable, UV-protected film and reliable coverage.
Key points:
- Six-mil, multi-layer PE film with UV resistance.
- Anti-drip surface reduces water droplets on foliage.
- Co-extrusion technology for improved strength and flexibility.
Buying Guide
Key purchase considerations:
- Material and thickness: Heavier films (8–20 mil) offer more durability and wind resistance, but weigh more and may be less flexible. Lighter films (6–8 mil) are easier to handle and cost-effective, suitable for smaller shelters or temporary covers.
- UV protection: UV inhibitors extend tarp life and protect plants from excess sun exposure. Look for explicit UV rating in product descriptions.
- Grommets and seams: Reinforced edges, rust-resistant grommets, and double-stitched seams improve longevity and ease of installation, especially in windy conditions.
- Thermal performance: Insulation or microclimate control features help regulate temperature swings, benefiting tropical or longer-cold-season growing in a 15×20 space.
- Light transmission: Clear or translucent films maximize light, while shade cloths reduce heat and sun stress. Consider a combination strategy for different seasons.
- Ventilation options: Some covers include roll-up doors or vent panels to adjust airflow and humidity—important for disease prevention and plant vigor.
- Fit and compatibility: Ensure the cover size matches your 15×20 frame or your specific greenhouse structure. Check dimensions and attachment methods before purchase.
Additional considerations from multiple perspectives:
- Durability vs. flexibility: In windy regions, thicker, reinforced covers tend to hold up better, while lighter films may suffice for short-term seasons or backup coverings.
- Maintenance needs: Some covers tolerate cleaning with mild soap and water, while others resist dirt accumulation more effectively due to hydrophobic properties.
- Economic balance: If you operate multiple greenhouses or staggered plantings, consider prioritizing UV protection and seam reinforcement in higher-wemand seasons to reduce replacement frequency.
- Environment and usage: For garden beds, hoop houses, or nurseries, choosing a combination of shade cloth and clear plastic can optimize both temperature control and light exposure.