Planta Greenhouses are crafted with European engineering and designed for strength and durability. Instead of flimsy DIY frames, its structures use galvanized-steel hoops and thick double-wall polycarbonate panels so you can grow crops even when the weather isn’t friendly. Two flagship models illustrate the brand’s premium yet affordable approach:
- Planta Greenhouses Sungrow 20: A heavy-duty 10 × 20 ft greenhouse designed for harsh winters. Its galvanized-steel frame and double-wall polycarbonate panels shrug off deep snow and high winds, making it ideal for growers who want to garden year-round in northern climates.
- Planta Greenhouses Sigma 20: A slightly more compact and budget-friendly tunnel design. It still uses galvanized steel and 6 mm double-wall panels, but its smaller footprint makes it perfect for backyard or moderate-climate gardeners.
These models demonstrate why Planta Greenhouses are considered premium yet accessible, with industrial-grade materials, strong snow-load ratings, and long warranties at a price within reach of serious home growers.
What This Article is About
This guide provides an honest comparison between two of Planta Greenhouses’ most popular models, Sungrow 20 and Sigma 20, and comparable models from Grizzly Shelter Ltd. You’ll see side-by-side specifications, key pros and cons, and clear guidance on which structure suits your climate and gardening style. If you’re wondering how Planta Greenhouses compares to Grizzly Shelter Greenhouses, this guide breaks it all down, so you can buy with confidence.
Sungrow 20 vs. Glory Premium Polycarbonate Greenhouse
Comparing Planta Greenhouses Sungrow 20 vs. Glory Premium Polycarbonate Greenhouse 8×20
Glory Premium Polycarbonate Greenhouse 8×20 from Grizzly Shelter (a Canopia by Palram greenhouse) is the closest match to the Sungrow 20 in footprint and price. It’s an 8 ft-wide structure available in 16 ft and 20 ft lengths. Below is how the two structures stack up.
Design & Aesthetics
- Planta Greenhouses Sungrow 20: Modern, curved-tunnel silhouette naturally sheds snow. Doors at both ends and optional roof vents provide good cross-flow. Galvanized-steel hoops give a sleek industrial look. Designed to be modular, extensions can be added to increase length.
- Glory Premium Greenhouse 8×20: Traditional greenhouse with straight sides and a steep roofline. The dark anthracite frame and clear twin-wall panels blend into most gardens. Includes three automatic roof vents and a side louvre window for passive ventilation.
Build Materials
- Planta Greenhouses Sungrow 20: Heavy-gauge galvanized steel frame with 6 mm double-wall polycarbonate panels standard; a 10 mm roof upgrade is available.
- Glory Premium Greenhouse 8×20: Reinforced aluminium frame with a galvanized-steel base. Uses 10 mm twin-wall polycarbonate panels for the roof and walls, thicker than most hobby houses.
Climate Resistance
- Planta Greenhouses Sungrow 20: Engineered for extreme winters; rated for snow loads around 75 psf and winds up to 65 mph.
- Glory Premium Greenhouse 8×20: Rated to withstand 25 lb/ft² snow load and winds up to 120 km/h (75 mph). Ten-millimetre panels provide good insulation and UV protection.
DIY Friendliness & Installation
- Planta Greenhouses Sungrow 20: Ships as a DIY greenhouse kit. Two to three people can assemble it over a weekend using basic tools. No concrete slab required—anchors screw directly into the ground.
- Glory Premium Greenhouse 8×20: A greenhouse DIY kit, but with more parts. Sliding panel system and pre-drilled profiles ease assembly; however, the aluminium frame may require more anchoring in windy areas.
Price-to-Performance Value
- Planta Greenhouses Sungrow 20: US $3,600–$3,900, including a 10-year warranty.
- Glory Premium Greenhouse 8×20: About US $5,000 for the 8 × 20 ft version, with a 10-year warranty.
Year-Round Growing Capabilities
- Planta Greenhouses Sungrow 20: Excellent insulation with double-wall polycarbonate; optional 10 mm roof for extra winter protection.
- Glory Premium Greenhouse 8×20: 10 mm panels diffuse light and insulate well, but lower snow-load capacity makes it more suitable for moderate winters.
Growing Space & Versatility
- Planta Greenhouses Sungrow 20: ~200 sq ft, 7 ft interior height, extendable beyond 30 ft.
- Glory Premium Greenhouse 8×20: ~160 sq ft, steep roof adds headroom, fixed length.
Post-Purchase Support
- Planta Greenhouses Sungrow 20: Backed by a 10-year warranty and an active Planta Greenhouses Community.
- Glory Premium Greenhouse 8×20: 10-year warranty, manufacturer support, but feedback notes more difficult assembly.
Key Differences: Sungrow 20 vs. Glory Premium Greenhouse
Key Differences: Planta Greenhouses Sungrow 20 vs. Glory Premium Polycarbonate Greenhouse 8×20
| Feature | Planta Greenhouses Sungrow 20 | Glory Premium Greenhouse 8×20 |
|---|---|---|
| Frame Material | Galvanized steel | Aluminium + galvanized base |
| Panel Thickness | 6 mm (opt. 10 mm) | 10 mm twin-wall |
| Snow-Load Capacity | ~ 75 psf | 25 lb/ft² |
| Wind Resistance | Up to 65 mph | Up to 75 mph |
| DIY Difficulty | Intermediate kit | Intermediate kit |
| Warranty | 10 years | 10 years |
| Price | US$3,600 to US$3,900 | ≈ US$5,000 |
| Extendability | Modular | Fixed sizes |
Table Text: Side-by-side comparison of Planta Greenhouses Sungrow 20 and Glory Premium Greenhouse 8×20
Why Choose Planta Greenhouses Sungrow 20?
If winters are brutal or you want a fortress-like greenhouse, the Sungrow 20 is unmatched. Its steel frame, double-wall panels, and 75 psf snow-load rating mean you can garden through blizzards. Modular design, 10-year warranty, and strong community support add peace of mind
👉Explore the entire Sungrow Greenhouses Collection here!
Why Choose Glory Premium Greenhouse 8×20?
The Glory Premium 8×20 Greenhouse is an excellent option for gardeners seeking a beautifully finished aluminum structure with reliable insulation and ventilation. Its 10 mm twin-wall polycarbonate panels deliver superior heat retention while diffusing sunlight evenly, creating an ideal growing environment throughout the seasons. Additional conveniences such as integrated gutters and a secure anchoring system make water management and installation simple.
👉 View the Glory Premium 8×20 Greenhouse on Amazon to explore current pricing and customer reviews.
Sigma 20 vs. Gothic Arch Bella Greenhouse
Comparing Planta Greenhouses Sigma 20 vs. Gothic Arch Bella Greenhouse 08×20
The Gothic Arch Bella Greenhouse 08×20 is another Palram/Canopia model sold through Grizzly Shelter. With its bell-shaped roofline and clear 6 mm twin-wall polycarbonate panels, it’s a good counterpart to the more budget-friendly Planta Greenhouses Sigma 20. Here’s how the two compare.
Design & Aesthetics
- Planta Greenhouses Sigma 20: The continuous tunnel-arc design maximizes airflow and distributes sunlight evenly across crops. Doors at both ends and optional roof vents support cross-ventilation, while the smooth curve offers a modern, functional aesthetic.
- Gothic Arch Bella Greenhouse 08×20: The bell-shaped roof helps shed snow naturally, while clear polycarbonate panels let in ample light. A wide double door at the front makes entry easy, giving it a traditional yet practical greenhouse look.
Build Materials
- Planta Greenhouses Sigma 20: Built with a galvanized steel frame and 6 mm double-wall polycarbonate panels. Steel base rails provide a solid anchor without the need for wood or concrete, ensuring long-term durability.
- Gothic Arch Bella Greenhouse 08×20: Constructed from an aluminum frame with a galvanized-steel perimeter base. The walls and roof use 6 mm twin-wall polycarbonate panels, lighter than steel but less robust overall.
Climate Resistance
- Planta Greenhouses Sigma 20: Rated for a snow load of about 32 psf and winds up to 65 mph. Its rounded tunnel design helps reduce wind drag and naturally sheds snow.
- Gothic Arch Bella Greenhouse 08×20: Rated for 20 lb/ft² snow load and winds up to 60 mph. While adequate for moderate climates, it requires more frequent snow clearing in heavy winter regions.
DIY Friendliness & Installation
- Planta Greenhouses Sigma 20: Delivered as a kit. Two people with intermediate DIY skills can assemble it over a weekend. No concrete foundation is needed, anchors screw directly into the ground.
- Gothic Arch Bella Greenhouse 08×20: Also a kit-based assembly. The lighter aluminum frame is easier to handle, but Grizzly Shelter recommends an optional anchor kit to secure it in windy conditions.
Price-to-Performance Value
- Planta Greenhouses Sigma 20: Priced around US $3,050, backed by a 5-year warranty. It offers industrial-grade strength at an accessible price point for dedicated hobbyists.
- Gothic Arch Bella Greenhouse 08×20: Costs approximately US $4,300 with a 5-year warranty. The higher price reflects its polished design, butit delivers lower snow and wind ratings compared to Sigma.
Year-Round Growing Capabilities
- Planta Greenhouses Sigma 20: Double-wall insulation helps stabilize temperatures for reliable year-round gardening. Its tunnel shape ensures light is distributed evenly, making it versatile for different crops.
- Gothic Arch Bella Greenhouse 08×20: Marketed as a four-season greenhouse, but with its lower snow-load rating, growers in harsher climates may need to clear snow manually in winter.
Growing Space & Versatility
- Planta Greenhouses Sigma 20: Provides about 196 sq ft of floor space with a 6′8″ interior height. Its modular design allows extensions up to 30 ft, making it adaptable as gardening needs grow.
- Gothic Arch Bella Greenhouse 08×20: Offers around 160 sq ft of space. The bell-shaped roof adds headroom, but the narrower width limits side space. Extension options are more limited compared to Sigma.
Post-Purchase Support
- Planta Greenhouses Sigma 20: Covered by a 5-year warranty with responsive customer support. Owners also benefit from the active Planta Greenhouses Community, where growers share real-world advice.
- Gothic Arch Bella Greenhouse 08×20: Backed by a 5-year warranty and manufacturer support, with optional accessories like automatic roof vent openers and anchor kits available.
Key Differences: Sigma 20 vs. Gothic Arch Bella
Key Differences: Planta Greenhouses Sigma 20 vs. Gothic Arch Bella Greenhouses 08×20
| Feature | Planta Greenhouses Sigma 20 | Gothic Arch Bella Greenhouse 08×20 |
|---|---|---|
| Frame Material | Galvanized steel | Aluminium + galvanized base |
| Panel Thickness | 6 mm double-wall | 6 mm twin-wall |
| Snow-Load Capacity | ~32 psf | ≥20 lb/ft² |
| Wind Resistance | Up to 65 mph | ~60 mph |
| DIY Difficulty | Intermediate kit | Intermediate kit |
| Warranty | 5 years | 5 years |
| Price | ≈ US$3,050 | ≈ US$4,300 |
| Extendability | Modular | Fixed length |
Table Text: Side-by-side comparison of Planta Greenhouses Sigma 20 and Gothic Arch Bella Greenhouse 08×20
Why Choose Planta Greenhouses Sigma 20?
The Planta Greenhouses Sigma 20 is the smart choice for growers who want strength on a budget. Galvanized steel, double-wall insulation, modular expansion, and affordable pricing make it ideal for hobbyists and serious gardeners alike.
Check out the full Sigma collection here!
Why Choose Gothic Arch Bella Greenhouse 08×20
The Gothic Arch Bella Greenhouse 08×20 blends elegant design with functional performance, making it a strong choice for those who appreciate both form and practicality. Its graceful bell-shaped roof not only adds visual appeal but also helps shed snow efficiently during colder months. The clear 6 mm twin-wall polycarbonate panels allow generous light transmission while softening harsh UV rays to protect plants.
Explore the Gothic Arch Bella Greenhouse on Amazon for details on pricing and availability.
