Planta Sungrow 20 (Gen III)
Rated for wind and snow, though you will not find either figure on a retailer product page.
Last checked 2026-08-29
What you should know before buying
The manual says 'wind speeds no more than 100 km/h (65 mph)'. The product page says 60 mph. Manufacturer's own documents disagree with each other; we report the manual figure and flag the conflict rather than silently choosing.
Automatic roof vents are an upsell, explicitly not in the kit.
The manual states: 'Roof vents are not included in this kit. We highly recommend adding Sungrow automatic roof vents to your order.' The kit ships with two door openings and two ventilating windows at opposite ends only. The product page's ventilation claims do not make this absence obvious.
Structure
| Width | 10 ft |
|---|---|
| Length | 20 ft |
| Floor area | 200 sq ft |
| Frame | hot-dip galvanised steel |
| Glazing | 6mm UV-protected polycarbonate |
| Panel thickness | 6 mm |
| Panel retention | not published |
Wind, snow and anchoring
| Wind rating | 65 mph |
|---|---|
| Rating depends on anchoring | Rated to 65 mph provided the specified loads are not exceeded; the manual states panels need not be removed in winter provided those loads hold |
| Snow load | 75 psf |
| Snow depth | not published |
| Anchoring included | Yes |
| What ships for anchoring | galvanised steel legs set about 1 ft into the ground, plus included ground anchors / angle brackets |
| Foundation required | suitable ground with ground anchors, or the buyer's own foundation |
Ventilation
| Roof vents | 0 |
|---|---|
| Side / end vents | 2 |
| Opening windows | No |
| Doors | 2 |
Ownership
| Expandable | Yes |
|---|---|
| Replacement panels | manufacturer sells polycarbonate sheets in 6/8/10/16/25mm |
Where to buy
Advertised prices, checked daily. Shipping is extra unless the retailer states otherwise — on a greenhouse, freight can change which seller is actually cheapest.
Price alert
Climate notes
Our analysis of the published figures — not a manufacturer claim.
- Hot climates
- NO ROOF VENTS in the kit — ventilation is two end windows and two doors only, with automatic roof vents sold separately. For a 200 sq ft footprint that is thin, and community reports describe 110-120F interiors even with powered fans. Budget the roof vent kit and a fan from the outset.
- Cold climates
- 75 psf snow load, stated in the manual, is the strongest in our set — five times the Palram Essence's 15 psf. The manual states panels need not be removed in winter provided the load ceiling is not exceeded. Caveat: the supplied legs go about 1 ft into the ground and do not reach frost depth in most cold regions, so a proper base is worth costing in.
- Exposed and windy sites
- 60 mph is modest against a Bellerose's claimed 100 mph, but Planta INCLUDES the anchoring its rating depends on, whereas most brands state the condition and leave the buyer to source it. On an exposed site that difference may matter more than the headline number.
What we don't know
Anything marked not published means the manufacturer does not state it. That is a fact about the product, not a gap on our side.
Figures are the manufacturer's own, taken from its documentation. We have not tested this greenhouse, and reporting a rating is not endorsing it. Wind, snow, permitting and foundation requirements vary by site — confirm anything that matters with the manufacturer and your local building authority before buying. Prices are what the retailer advertised when we last checked and exclude shipping unless stated.