Greenhouse Covers – Give Your Plants a Fresh Start
A greenhouse is only as good as its cover. Over time, sun, wind, and rain take their toll – plastic becomes brittle, seams split, and zippers stick. But that doesn‘t mean your frame is ready for the scrap heap. A fresh greenhouse cover can bring your walk-in or mini greenhouse back to life for a fraction of the cost of a new structure. At Aosom, we carry over 127 replacement and accessory covers from Outsunny, including heavy-duty PE tarps for large walk-in models, clear PVC covers for cold frames, and portable covers for mini greenhouses and tunnel structures. Sizes range from compact 4-foot mini greenhouses to 20-foot walk-in models. Colors include classic green, white, clear, and silver. Whether you‘re replacing a worn-out cover or buying a spare, you‘ll find the right fit here.
PE vs. PVC – Which Greenhouse Cover Material Is Right for You?
Most replacement covers are made from either polyethylene (PE) or polyvinyl chloride (PVC). Each has its strengths, and the best choice depends on your climate and how you use your greenhouse.
- Polyethylene (PE) covers: Lightweight, affordable, and widely available. Most Outsunny replacement covers use reinforced PE with a rip-stop grid – this prevents small tears from spreading. PE offers good light diffusion (less shadowing) and is easy to handle. However, it typically lasts 2-4 years before UV degradation weakens it. The Outsunny 19.7' x 9.8' Heavy Duty PE Cover in White is a popular choice for large walk-in greenhouses.
- Polyvinyl Chloride (PVC) covers: Heavier, more rigid, and more durable than PE. PVC offers excellent light transmission (nearly glass-like clarity) and better heat retention, making it ideal for cooler climates or year-round growing. It can last 5-7 years with proper care. The trade-off? It‘s heavier and more expensive. The Outsunny 4' x 2' Portable Mini Greenhouse with Clear PVC Cover is perfect for seedlings and cold frames.
- Which one for you? If you‘re a hobbyist growing seasonally and want an affordable, easy-to-install cover, go with PE. If you‘re serious about overwintering plants or gardening year-round in a cold climate, invest in PVC.
Sizing Your Replacement Cover – Measure Twice, Order Once
A cover that‘s too loose will flap in the wind and tear. One that‘s too tight will strain the zippers and seams. Here‘s how to get it right:
- Walk-in greenhouses (standard sizes): Most Outsunny walk-in models come in common dimensions – 6'x3', 6'x4', 7'x5', 10'x6', and 20'x10'. Replacement covers are listed by the exact frame size. The Outsunny 55"x56"x74" Replacement Cover fits a specific 7' walk-in frame.
- Mini greenhouses (shelf units): These are measured by width, depth, and height. A 4-tier or 5-tier mini greenhouse typically needs a cover that matches the number of shelves. The Outsunny 5-Tier Mini Greenhouse Cover is designed for a 27"x19" frame.
- Tunnel greenhouses: These are measured by length, width, and height at the peak. A 13-foot tunnel needs a cover that‘s roughly 13' long, 3' wide, and 2.5' tall. The Outsunny 13' Tunnel Greenhouse Cover includes multiple zippered doors for easy access.
- Raised bed covers: Some covers are designed to fit over elevated garden beds or cold frames. Measure the outer dimensions of your bed, including height. The Outsunny 48" Elevated Garden Bed with Cover combines planter and cover in one.
Features That Make a Greenhouse Cover Easier to Use
Not all replacement covers are created equal. Look for these practical features when shopping:
- Zippered roll-up doors: A full-length zipper that rolls up and ties open gives you easy access without removing the entire cover. Most Outsunny walk-in covers include this feature.
- Mesh windows: Built-in mesh panels allow ventilation while keeping out insects and birds. They‘re essential for preventing overheating on sunny days.
- Reinforced corners and edges: Extra layers of fabric or binding at stress points prevent tearing where the cover attaches to the frame.
- Tie-down loops or straps: These help you secure the cover tightly to the frame. Some covers also include stakes for ground anchoring.
- UV stabilization: All Outsunny greenhouse covers are treated to resist UV degradation. Look for “UV-resistant” or “UV-stabilized” in the product description – it directly affects how many seasons your cover will last.
- Clear or opaque?: Clear covers (PVC) maximize light for seedlings. Opaque or diffused covers (PE) reduce scorching and create more even temperatures.
Installing & Caring for Your Greenhouse Cover
A little care goes a long way. Follow these tips to get the most life from your replacement cover:
- Installation: Always put the cover on a calm, dry day. Start by draping it over the frame, then work from the top down, pulling the cover evenly. Secure all tie-downs before zipping doors.
- Avoid sharp edges: If your frame has rough or rusty spots, sand them down or wrap them with duct tape before installing the new cover.
- Cleaning: Wash PE and PVC covers with mild soap and a soft sponge. Never use harsh chemicals, bleach, or pressure washers – they will damage the UV coating.
- Winter care: In snowy areas, remove heavy snow from the roof to prevent stretching or tearing. Some gardeners take the cover off entirely during heavy snow months.
- Storage: If you‘re not using your greenhouse for a season, remove the cover, fold it loosely (not tightly creased), and store it in a cool, dry place away from rodents.
- Repairing small tears: Use greenhouse repair tape (clear or white) on clean, dry fabric. Apply to both sides of the tear for a longer-lasting fix.
Frequently Asked Questions About Greenhouse Covers
❓ How long does a greenhouse cover typically last?
It depends on the material and your climate. Standard PE covers (like most Outsunny replacements) last 2-4 years with proper care. UV-stabilized PE can stretch to 4-5 years. PVC covers last 5-7 years but are heavier and more expensive. To maximize lifespan, take the cover down during heavy snow, store it indoors when not in use for months, and avoid dragging it across rough surfaces. The Outsunny Heavy Duty Green Cover is built with thicker material for extended durability.
❓ Can I use a replacement cover on a different brand of greenhouse frame?
Sometimes, but it‘s not guaranteed. Outsunny covers are designed for Outsunny frames. However, if your frame has similar dimensions (length, width, height) and the same general shape (peaked roof, straight walls, etc.), an Outsunny cover may fit. Measure carefully and compare with the product‘s stated dimensions. For mini greenhouses and tunnels, the fit is more forgiving. For walk-in models, a mismatch of even an inch can cause loose fabric or broken zippers. When in doubt, contact customer service with your frame‘s measurements.
❓ Do I need a cover for a raised garden bed with a greenhouse top?
If your raised bed includes a hoop or frame structure, yes – the cover is what creates the greenhouse effect. Outsunny offers all-in-one raised bed and cover kits, like the Outsunny 4'x3' Raised Garden Bed with PVC Cover. These are excellent for starting seeds in spring and extending harvests into fall. Without the cover, the frame alone provides no frost protection. Replacement covers for these kits are also available separately.
Don‘t let a tired, torn cover end your growing season. Browse the full collection of greenhouse covers, replacement tarps, and portable covers at Aosom. With free shipping, Flag Day Sale discounts, and over 100 covers in stock, reviving your greenhouse is simple and affordable. Shop today and give your plants the protection they deserve.
