Planta Greenhouses vs TMG Industrial Greenhouses: Which Greenhouse Is Better for Your Climate & Garden Goals?
Planta Greenhouses is a European-engineered brand specializing in heavy-duty, climate-resistant greenhouses designed for year-round cultivation. The company uses galvanized steel frames and double-wall polycarbonate panels to deliver strength, insulation, and UV protection at competitive prices.
Two flagship models illustrate the brand’s ethos:
- Planta Greenhouses Sungrow 20: A bell-shaped 10 × 20 ft greenhouse engineered for harsh winters. Its galvanized-steel frame and 6 mm/10 mm double-wall polycarbonate cladding handle up to 75 psf of snow and winds up to 65 mph.
- Planta Greenhouses Sigma 20: An arch-shaped 10 × 19.5 ft model using the same galvanized steel and 6 mm double-wall polycarbonate. Rated for 32 psf of snow and 65 mph winds, it provides solid protection at a lower cost and carries a five-year warranty.
Together, these models demonstrate why Planta Greenhouses positions itself as premium yet affordable: heavy-duty materials, high snow-load ratings, and generous warranties at prices accessible to serious gardeners.
What This Article is About
This guide delivers a clear comparison of the Planta Greenhouses Sungrow 20 and Sigma 20 against their closest counterparts from TMG Industrial. Each section examines design, materials, climate performance, installation complexity, price-to-performance, growing space, and support options.
If you’re wondering how Planta Greenhouses compares to TMG Industrial Greenhouses, this guide breaks it all down—so you can buy with confidence.
Comparing Sungrow 20 vs. 10′ × 20′ Tunnel Greenhouse
Comparing Planta Greenhouses Sungrow 20 vs. TMG-GH1020P 10′ × 20′ Tunnel Greenhouse with Ripstop Leno Cover
The TMG-GH1020P is the closest TMG model in footprint (10′ W × 20′ L × 7′ H). Below, we break down the comparison.
Design & Aesthetics
- Planta Greenhouses Sungrow 20: Bell-shaped arch with straight sidewalls, designed to shed snow and provide ample headroom. Dual doors and ventilation windows at both ends enhance cross-ventilation.
- TMG-GH1020P Greenhouse: Rounded tunnel with a roll-up entry door and six roll-up mesh windows for ventilation. A utilitarian “hoop house” looks like it has less headroom.
Build Materials
- Planta Greenhouses Sungrow 20: Galvanized-steel frame and 6 mm (10 mm optional) double-wall polycarbonate glazing.
- TMG-GH1020P Greenhouse: Galvanized-steel tube frame (1″, 19-GA) with 8-mil Leno-weave tarpaulin (UV-coated, waterproof, ripstop).
Climate Resistance
- Planta Greenhouses Sungrow 20: Engineered for heavy snow with a 75 psf rating (≈ six feet of accumulation). Withstands winds up to 65 mph.
- TMG-GH1020P Greenhouse: No published snow-load or wind rating. Tarpaulin cover offers minimal insulation.
DIY Friendliness & Installation
- Planta Greenhouses Sungrow 20: Ships as a pre-cut kit with detailed instructions. Intermediate DIY build, can be installed with or without a foundation. Modular extension kits allow for a scalable length.
- TMG-GH1020P Greenhouse: Beginner-friendly. Tubes bolt together, tarp drapes over. Anchoring is required for stability.
Price-to-Performance Value
- Planta Greenhouses Sungrow 20: US $3,800–$4,000. Heavy steel construction, high snow-load rating, 10-year warranty.
- TMG-GH1020P Greenhouse: ≈ US $899. Budget-friendly, but with minimal insulation and support.
Year-Round Growing Capabilities
- Planta Greenhouses Sungrow 20: Double-wall polycarbonate and tight seals retain heat, supporting winter crops and early spring seedlings.
- TMG-GH1020P Greenhouse: Works more as a season extender. Tarp loses heat quickly; supplemental heating is inefficient.
Growing Space & Versatility
- Planta Greenhouses Sungrow 20: 94.5″ H × 118″ W × 238.6″ L. Straight walls maximize shelving and benching. Modular extensions are possible.
- TMG-GH1020P Greenhouse: 10′ × 20′ × 7′ tunnel. Narrower sidewall headroom and fewer shelving options.
Post-Purchase Support
- Planta Greenhouses Sungrow 20: Backed by a 10-year warranty and responsive customer service. Optional free seasonal storage.
- TMG-GH1020P Greenhouse: Warranty not specified. Replacement tarps available.
Key Differences: Sungrow 20 vs. TMG-GH1020P 10′×20′
Key Differences: Planta Greenhouses Sungrow 20 vs. TMG-GH1020P 10′×20′ Greenhouse
| Feature | Planta Greenhouses Sungrow 20 | TMG-GH1020P 10′×20′ Greenhouse |
|---|---|---|
| Frame material | Galvanized steel | Galvanized-steel tubes (1″, 19-GA) |
| Panel/Cover | 6/10 mm double-wall polycarbonate | 8-mil Leno-weave tarpaulin |
| Snow-load | 75 psf | Not published |
| Wind | 65 mph | Not published |
| DIY difficulty | Intermediate kit; extendable | Beginner hoop-house |
| Warranty | 10-year | Not specified |
| Approx. price | US $3,800–$4,000 | ≈ US $899 |
| Seasonal storage | Yes free winter storage | Not advertised |
Why Choose Planta Greenhouses Sungrow 20?
- Heavy-duty design for harsh climates: Withstands heavy snow and strong winds.
- Year-round gardening: Bell-shaped roof sheds snow efficiently.
- Top-rated support: Backed by a 10-year warranty and responsive service.
- Maintenance-free operation: Robust materials require minimal upkeep.
Explore the entire Sungrow collection here!
Why Choose TMG-GH1020P Tunnel Greenhouse?
The TMG‑GH1020P is a cost‑effective option for gardeners with mild climates or seasonal growing needs:
- Budget friendly: Around US $899, ideal for beginners and small budgets.
- Quick assembly: Pre‑drilled steel tubes and a flexible tarpaulin make setup straightforward.
- Plenty of ventilation: Roll‑up windows and doors let you control airflow.
- Portable: Lightweight design makes relocation easy if needed.
Sigma 20 vs. TMG-GH820 8′ × 20′ Greenhouse
Comparing Planta Greenhouses Sigma 20 vs. TMG-GH820 8′ × 20′ Aluminum Frame Greenhouse with 4 mm Twin-Wall Polycarbonate
The TMG-GH820 Greenhouse is TMG’s polycarbonate model closest in length to Sigma, though slightly narrower in width.
Design & Aesthetics
- Planta Greenhouses Sigma 20: Continuous tunnel arc maximizes interior width and airflow. Two doors, manual vents, and an extendable design.
- TMG-GH820 Greenhouse: Narrower 8′-class tunnel. Includes four roof vents and a 43″ × 72″ swing door.
Build Materials
- Planta Greenhouses Sigma 20: Galvanized-steel pipe frame with 6 mm double-wall polycarbonate.
- TMG-GH820 Greenhouse: Aluminum frame with 4 mm twin-wall polycarbonate; ground base bars for stability.
Climate Resistance
- Planta Greenhouses Sigma 20: Rated for 32 psf snow and winds up to 65 mph.
- TMG-GH820 Greenhouse: UV-protected glazing; no published snow-load or wind rating.
DIY Friendliness & Installation
- Planta Greenhouses Sigma 20: Pre-cut modular kit for intermediate DIYers; extendable beyond 100 ft.
- TMG-GH820 Greenhouse: Beginner-friendly kit; lighter frame and panels simplify setup.
Price-to-Performance Value
- Planta Greenhouses Sigma 20: US $2,900–$3,500 with a 5-year warranty.
- TMG-GH820 Greenhouse: ≈ US $1,900–$2,000. Affordable but thinner panels and a lighter frame.
Year-Round Growing Capabilities
- Planta Greenhouses Sigma 20: 6 mm panels retain heat, supporting reliable winter cultivation.
- TMG-GH820 Greenhouse: 4 mm panels offer modest insulation; additional heating needed in cold regions.
Growing Space & Versatility
- Planta Greenhouses Sigma 20: 83.9″ H × 118.1″ W × 236.9″ L. Straight sidewalls maximize usable space. Extendable.
- TMG-GH820 Greenhouse: 89″ ridge height, 62″ sidewalls, 7.75′ width. Narrower interior, but four roof vents aid humidity control.
Post-Purchase Support
- Planta Greenhouses Sigma 20: Covered by a 5-year warranty and Planta Greenhouses customer support. Free seasonal storage option.
- TMG-GH820 Greenhouse: Warranty not prominently listed; support varies by retailer.
Key Differences: Sigma 20 vs. TMG-GH820 8′×20′
Key Differences: Planta Greenhouses Sigma 20 vs. TMG-GH820 8′×20′ Greenhouse
| Feature | Planta Greenhouse Sigma 20 | TMG-GH820 8′×20′ Greenhouse |
|---|---|---|
| Frame material | Galvanized steel | Aluminum |
| Panel thickness | 6 mm double-wall polycarbonate | 4 mm twin-wall polycarbonate |
| Snow-load | 32 psf | Not published |
| Wind | 65 mph | Not published |
| DIY difficulty | Intermediate kit; extendable | Beginner kit |
| Warranty | 5-year | Not advertised |
| Approx. price | US $3,000–$3,500 | ≈ US $1,900–$2,000 |
| Seasonal storage | Yes free winter storage | Not available |
Why Choose Planta Greenhouses Sigma 20?
- Compact strength: Tunnel design promotes airflow and even light.
- Versatile across climates: Rated for moderate snow and wind.
- Long-lasting materials: Steel frame + 6 mm polycarbonate ensure durability.
- Smart investment: Extendable, affordable, and backed by a 5-year warranty.
👉 Check out the full Sigma collection here!
Why Choose TMG-GH820 8′×20′ Greenhouse?
For those seeking a mid‑range greenhouse with polycarbonate panels, the TMG‑GH820 provides several benefits:
- Lightweight aluminum frame: Easy to handle and resistant to rust.
- Twin‑wall polycarbonate: 4 mm panels diffuse light and protect plants from UV rays.
- Adjustable ventilation: Four roof vents and a wide door provide airflow.
- Beginner friendly: Modular kit allows for a straightforward build.
