Planta Sungrow 20 (Gen III)
Its structural ratings are published in the assembly manual — not on any retailer product page.
23 of 45 fields researched · last updated 2026-08-29
What the manual says that the product page doesn't
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. This also resolves the 60-vs-65 discrepancy against our earlier competitor research, which had 65.
source documentAutomatic roof vents are an upsell, explicitly not in the kit.
source documentMANUAL, verbatim: '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.
source documentStructure
| Width | 10 ft source |
|---|---|
| Length | 20 ft source |
| Floor area | 200 sq ft source |
| Frame | hot-dip galvanised steel source |
| Glazing | 6mm UV-protected polycarbonate source |
| Panel thickness | 6 mm source |
| Panel retention | not published |
Wind, snow and anchoring
| Wind rating | 65 mph source from the manual |
|---|---|
| …which assumes | 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 source from the manual |
| Snow load | 75 psf source from the manual |
| Snow depth | not published |
| Anchoring included | Yes source |
| What ships for anchoring | galvanised steel legs set about 1 ft into the ground, plus included ground anchors / angle brackets source |
| Foundation required | suitable ground with ground anchors, or the buyer's own foundation source |
Ventilation
| Roof vents | 0 source from the manual |
|---|---|
| Side / end vents | 2 source from the manual |
| Opening windows | No source from the manual |
| Doors | 2 source |
Ownership
| Expandable | Yes source |
|---|---|
| Replacement panels | manufacturer sells polycarbonate sheets in 6/8/10/16/25mm source |
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
22 of 45 fields are still unresearched, and fields marked not published mean the manufacturer does not state them — that is a finding about the product, not a gap in our research.
Every figure above links to the document it came from. We have not tested this greenhouse. Local wind, snow, permitting and foundation requirements vary; confirm anything that matters with the manufacturer and your local building authority before buying.