Sigma 20

Sigma 20

4.6
Rated 4.6 out of 5 stars
22 Reviews

Approx Size: 10' × 19.5' × 7'

Imagine a garden filled with life yet untouched by time. A space where you can harvest heat-loving vegetables while a piercing winter storm is raging outside the door. A stable environment where vine-ripe tomatoes and succulent strawberries will thrive. A lovely quiet space to spend away from work, kids, and the chores of life.

Features

Strong and spacious: long-lasting construction, weather-resistant materials, and roomy design.

  • Wind resistant up to 65 mph for those living in gusty climates.
  • Withstands a snow load of up to 3 feet (32 psf)
  • Made with a heavy-duty galvanized pipe frame and strong polycarbonate panels
  • Arched shape - so the wind, snow, and hail just slide off the sides.
  • Extendable beyond 100ft - so you can expand your greenhouse when you're ready.
  • Maintenance-free means you have more time to focus on your garden.
  • We offer a 5-year warranty because our greenhouse is heavy-duty and long-lasting.
Regular price $3,500 CAD
Regular price $3,800 CAD Save $300 Sale Sale price $3,500 CAD
Sold out

Have questions? Call us 1-877-669-1286
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About Sigma 20

The Planta Sigma 20 is an urban gardener's dream come true. The quality heat-capturing materials allow for 3 or 4 season gardening, meaning you'll be able to harvest delicious fruits and vegetables beyond the outdoor growing season. Additionally, the rounded design is incredibly spacious, giving you the room to make the most out of your backyard garden.


Exact size: 118.1 x 83.9 x 236.99 inches


Feel confident knowing that the rust-resistant galvanized pipe frame is tough enough to withstand a variety of severe weather conditions – keeping your garden safe and sound throughout the year.

The greenhouse comes with:

  • two doors
  • two manual windows
  • the option to install multiple windows.

The Sigma 20 greenhouse is extremely pleasant to work in throughout the day due to the end-to-end airflow and the distinctive 7ft roof height.

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Snow Load Up To 32 psf (160 kg / m²)
32 psf (160 kg / m²) is equal to 3 feet fresh snow layer or 1.5 feet packed snow layer and is maintenance free in the winter More About PSF
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Wind Resistant up to 65 mph (100 km/h)
Sturdy greenhouse construction that resists winds up to 65 mph (100 km/h)
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Extendable & Customizable
This greenhouse can be extended with additional expansion kits
 
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4.6
Rated 4.6 out of 5 stars
Based on 22 reviews
Total 5 star reviews: 16 Total 4 star reviews: 4 Total 3 star reviews: 1 Total 2 star reviews: 1 Total 1 star reviews: 0
91%would recommend this product
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22 reviews
  • RL
    Renee Latour H.
    Verified Buyer
    I recommend this product
    Location Tennessee
    Rated 5 out of 5 stars
    9 months ago
    Sigma 20’ Greenhouse

    We are loving the greenhouse. Thank you!

    Took about 7 days with 2 people to build, that’s with the learning curve and building up a level foundation.

    We chose to dig the holes and bury the legs instead of putting on concrete or 6x6’s.

    The panels had dust left inside them from the cuts from the factory and we used an air hose to remove the dust inside the panels before taping the ends. No big deal.

    It’s up and growing!

    Thank You, it’s a great purchase.

    PG Profile picture for Planta Greenhouses Canada
    Planta Greenhouses Canada
    9 months ago

    Great pictures! Your insights into the assembly process and innovative approach to foundation building are appreciated. If you ever need assistance or have more feedback, feel free to reach out. Happy growing 🌱🏡

  • TK Profile picture for Tammy K.google logo
    Tammy K.
    Verified Buyer
    Location North Carolina
    Rated 3 out of 5 stars
    11 months ago
    Missing bolts

    The greenhouse itself seems to be of decent quality. My only complaints are we were shorted a large number of bolts, that coupled with the difficult assembly and poor instructions is why I gave it 3 stars.

    PG Profile picture for Planta Greenhouses Canada
    Planta Greenhouses Canada
    11 months ago

    Hi Tammy,

    Thanks for sharing your feedback! 🌿 We've taken these comments seriously and after a year of hard work, we've digitized our instructions for a smoother assembly experience: https://www.youtube.com/watch?v=lZRE1g8YSsw

    If you ever need further assistance, please don't hesitate to contact our customer service at info@plantagreenhouses.com 🌻

  • MM
    Marshall M.
    Verified Buyer
    I recommend this product
    Location Oregon
    Rated 5 out of 5 stars
    11 months ago
    Got it together for Fall...

    The only issues I had were some ambiguity in the assembly diagrams. We wanted some additional internal height so we mounted it with raised foundation. Overall very pleased. Still need to fine tune the fit between the door and the window.

    PG Profile picture for Planta Greenhouses Canada
    Planta Greenhouses Canada
    11 months ago

    Thank you for your feedback. We're working on improving our instructions for a better experience. If you have any questions or need help with the door and window fit, please email us at info@plantagreenhouses.com. Enjoy your greenhouse!

  • JJ
    Jeremiah j.
    Verified Buyer
    I recommend this product
    Location Nevada
    Rated 4 out of 5 stars
    11 months ago
    Awesome

    It is an awesome greenhouse. I'm giving it 4 stars only because the instructions were hard to understand. I would also recommend having more than 2 people to help you build it.

    We haven't gotten bad weather yet where I'm at. So im giving that ranking a 3 for right now.

    PG Profile picture for Planta Greenhouses Canada
    Planta Greenhouses Canada
    11 months ago

    Thank you for your fantastic feedback and for choosing our greenhouse! 🌿 We appreciate your honest input about the instructions and the need for additional help during assembly. Your insights are valuable to us as we continue to improve.

    We hope your greenhouse serves you well and provides a fantastic gardening experience. 🌱🏡😊

  • JC
    JONATHAN C.
    Verified Buyer
    I recommend this product
    Rated 4 out of 5 stars
    1 year ago
    Very nice

    It is great for growing peppers and cucumbers in the summer with a shade cloth added to keep the temperature from getting out of hand. I like it so far

    PG Profile picture for Planta Greenhouses Canada
    Planta Greenhouses Canada
    1 year ago

    Hi Jonathan,

    Thank you for sharing your positive experience. We're glad to hear that your Sigma 20 is working well for your pepper and cucumber growing needs. Happy gardening! 🌶️🥒😊

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Shipping

Sigma 20 ships in these boxes:

  L, (in) W, (in) H, (in) Weight, (lbs) Quantity
Sigma Base 1 62 11 3 46 1
Sigma Base 2 76 20 2 77 1
Sigma Polycarbonate Base 83 44 3 55 1
Sigma Extension 77 17 3 42 1
Sigma Polycarbonate Extension 83 44 2 20 2

 

Greenhouses are amazing products, and they require special shipping and handling. That is the reason, we have been working diligently over the past year to secure preferential shipping rates for our customers. Most shipments across Canada and the US are between $250 and $450. 

  • We will contact you to confirm shipping price, based on your location and order size.
  • Shipping on most residential greenhouse orders is between $250 and $450, customers in remote areas may need to pay extra.
  • When you place your order, please make sure to enter the correct Phone and Address at checkout. You will be contacted by phone before the item is shipped. We cannot be responsible for deliveries to incorrect addresses.
  • As part of the delivery process, we require a contactable telephone number (for the courier company to contact you) before the item is shipped.
  • White glove delivery service isn't available. The greenhouse components are delivered in multiple boxes, the largest of which weighs 80lbs. The greenhouse will be delivered to your driveway. Please make arrangements to have the package moved to its installation location. 
  • We do not ship to PO Boxes, as in most cases you will need to sign for your item.  
  • Orders placed on weekends or public holidays will not begin processing until the next business day. 

 

FAQs