Planta Greenhouses

Sigma 20 Greenhouse

Sigma 20 Greenhouse

Approx Size: 10' × 19.5' × 7'

Regular price $2,900.00 USD
Regular price $3,200.00 USD Sale price $2,900.00 USD
Sale Sold out

Imagine a lush, vibrant garden untouched by the changing seasons—a place where you can grow hot peppers and exotic fruits regardless of where you live. The Planta Sigma 20 puts the power of an agricultural greenhouse into the hands of the backyard gardener.

  • Features two split doors at either end.
  • Wind resistant up to 65 mph (100 km/h) and ideal for breezy areas.
  • Withstands snow loads up to 3 feet (32 psf), making it perfect for snowy climates.
  • Constructed with 6mm double-walled polycarbonate and a sturdy galvanized pipe frame.
  • Wind, snow, and hail easily slide off of the arched design.
  • Extendable and customizable so you can create a unique space for your needs.
  • Rust-resistant and maintenance-free for less worry year-round.
  • Reliable and long-lasting with a 5-year warranty.
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Rated 5.0 stars
Based on 2 reviews
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
2 reviews
  • HM
    Hamish M.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    2 months ago
    I will be recommending them to others.

    Purchasing from Nova Greenhouses was a smooth experience. Their customer service team was attentive, helped us find what we needed, and promptly shipped it to our home.

    Was this helpful?
  • JA
    Joy A.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    3 months ago
    I'm so excited to see what I can grow now.

    The instructions were a little confusing, but we put our heads together and figured everything out. The greenhouse itself is beautiful and feels very secure.

    Was this helpful?
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  • 5-year Limited Warranty

  • Extendable up to 100ft

  • Windproof up to 65 mph (100 km/h)

  • 32 psf (160 kg/m²) snow load

The Planta Sigma 20 is the ultimate growing sanctuary for inner-city and suburban gardeners. Harvest homegrown fruits and vegetables 3 to 4-seasons a year, thanks to the highly-insulating polycarbonate.

Furthermore, the rounded shape creates plenty of extra space for your backyard garden to grow and flourish.

The rust-resistant galvanized pipe frame is long-lasting and built to endure a wide range of weather conditions. Feel confident knowing that this greenhouse will keep your garden safe and secure all year round, regardless of your climate.

The Sigma 20 greenhouse comes with:
• Two doors
• Two manual windows
• The option to install multiple windows

Finally, because of its unique 7ft ceiling height and end-to-end ventilation, the Sigma 20 Greenhouse will keep you and your plants comfortable and cool throughout even the sunniest days.

About Planta Greenhouses

Planta Greenhouses has combined innovative engineering with practical design to develop some of the strongest and most versatile greenhouses available. 

The heavy-duty galvanized steel frames and durable polycarbonate panels mean Planta Greenhouses are capable of withstanding one of the highest wind and snow loads of any residential greenhouse kit on the market. 

Finally, with key features such as extendable length and customizable design, Planta Greenhouses are truly a one-of-a-kind solution for your backyard gardening needs.


How much snow can the Sigma greenhouse hold?

On top of the greenhouse, the Planta Sigma models can support up to 3 feet of fresh snow (32 psf or 160 kg / m2).

What is the wind resistance on the Sigma greenhouse models?

The Planta Sigma Greenhouse can withstand wind speeds up to 65 mph (100kph).

Are there customization options for the Sigma greenhouse?

Planta Greenhouses Sigma model can be extended up to 100ft. Additionally, vents, fans, heaters, and lights can easily be incorporated post-purchase.

Is the greenhouse equipped with doors on both ends?

Absolutely! The Planta Sigma models feature 2 manual split doors on either end of the greenhouse.

What materials are used to construct the Sigma Greenhouse?

Planta Greenhouses has designed their Sigma Models with 6mm double-walled polycarbonate panels with a UV-protected exterior. The greenhouse frame is made out of strong, heavy-duty galvanized pipe.