Looking for a blackout cover for your greenhouse? This guide highlights top 5 options optimized for light control, durability, and value. Ideal for seed starting, season extension, or reversing light cycles, these covers help you tailor light exposure. Best for serious hobbyists, professional growers, and budget-conscious gardeners alike, each pick is described with who it suits best and why it stands out.
Overview of top picks
| Product | Size | Mil | Best For | Why It Stands Out |
|---|---|---|---|---|
| Farm Plastic Supply Panda Film 6 mil | 40′ x 20′ | 6 | Small-to-medium greenhouses | Balanced thickness, durable, dual-sided black/white, good light control |
| Farm Plastic Supply Panda Film 6 mil | 10′ x 25′ | 6 | Compact setups | Compact footprint with strong UV resistance |
| Grow1 9 Mil Blackout Film | 40′ x 100′ | 9 | Hoop houses, larger projects | Extra-tough, reinforced woven design, superior durability |
| VBS Panda Film 6 mil | 30′ x 25′ | 6 | Mid-sized structures | Reliable light control with durable 6 mil film |
| Farm Plastic Supply Panda Film 20 mil | 12′ x 40′ | 20 | Extreme light control needs | Thickest option, excellent blackout but heavier to handle |
Farm Plastic Supply Panda Film, 6 Mil, 40′ x 20′
Best for mid-sized greenhouses seeking reliable, balanced light control. This 6 mil black/white poly film is designed to provide complete darkness with a white exterior reflecting light and a black interior for a dark growing environment. Its UV inhibitor enhances longevity under sun exposure, making it a solid choice for outdoor setups.
Who it’s best for: hobbyists or small commercial growers needing a durable, easy-to-handle blackout cover without excessive weight.
Caution: While durable, some users may prefer a thicker film in extremely sunny climates or highly demanding environments.
Farm Plastic Supply Panda Film, 6 Mil, 10′ x 25′
Compact, space-saving blackout cover designed for smaller greenhouses or portable tents. The 6 mil construction plus white/black sides offers dependable light control and reflective exterior for heat management.
Best for: growers with tight spaces, seedling flats, or temporary greenhouses needing quick setup and reliable darkness.
Limitation: Smaller size may require multiple pieces for larger areas or longer spans.
Grow1 Black & White Light Deprivation Film, 9 Mil
Best for larger hoop houses or longer-term projects requiring extra durability. The 9 mil blackout film uses a patented reinforced woven design to resist tearing, with black on one side and white on the other for robust light management and weather resistance.
Who it’s best for: growers needing high durability and extended use in variable climates.
Limitation: Heavier than 6 mil options, which may require stronger mounting and handling during installation.
VBS Panda Film 6 Mil, 30′ x 25′
Clear choice for mid-sized greenhouses needing dependable blackout with a standard 6 mil thickness. It provides balanced light control with robust UV protection to resist sun exposure.
Best for: users who want a straightforward blackout solution that balances light control with manageable weight and ease of setup.
Caution: Not ideal for extreme climates where thicker film options offer greater insulation and durability.
Farm Plastic Supply Panda Film, 20 Mil, 12′ x 40′
Heaviest option in this guide, designed for extreme light control needs or harsh environments. The 20 mil film delivers maximum blackout capability, minimizing light leakage.
Best for: larger, well-ventilated greenhouses or experiments requiring nearly complete darkness. Better for permanent installations where handling heavier material is feasible.
Limitation: Heavier and potentially less convenient to install in tight spaces or when frequent adjustments are needed.
Buying Guide
- Light control needs: For seed starting or flowering cycles, choose 6–9 mil films for reliable darkness with manageable handling. For maximum blackout, consider 20 mil, especially in bright climates.
- Climate and sun exposure: A UV inhibitor helps extend life in sunny areas. Thicker films typically endure more exposure but require sturdier framing.
- Greenhouse size and setup: Larger spaces may benefit from 9–6 mil options with reinforced weaving, while smaller spaces can use compact 6 mil sheets with simple mounting.
- Durability vs. handling: Heavier films offer longevity but are harder to install. Weigh installation effort against desired lifespan.
- Warranty and compatibility: Check for UV inhibitors and compatibility with existing frames or coverings to avoid tearing at seams or attachments.
Frequently Asked Questions
- What is blackout greenhouse film best used for? Controlling light cycles to promote specific growth stages, regulate heat, and reduce unwanted photosynthesis during dark periods.
- How thick should a blackout cover be? 6–9 mil is common for general use; 20 mil provides maximum blackout for extreme conditions but is heavier to handle.
- Can I use blackout film on any greenhouse? Most plastic greenhouses accommodate standard rolls, but confirm dimensions and mounting method to ensure a proper fit.
- Will blackout film deteriorate in the sun? Look for films with UV inhibitors; they resist sun damage better and last longer in outdoor environments.
- Is it better to buy two smaller sheets or one large sheet? It depends on your greenhouse geometry and seam management. Multiple pieces can simplify installation but may introduce seams where light leaks could occur.
- How do I install blackout film securely? Use reinforced edges, proper grommets or fasteners, and secure tension to prevent flapping in wind and minimize tearing at seams.