Sigma Medium 20 (Gen III)
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Metal Sigma 250 (Gen III) greenhouse structure in a warehouse setting
Sigma 250 (Gen III) greenhouse with transparent panels in a warehouse setting
Sigma 250 (Gen III) greenhouse in a garden with trees and flowers around
Metallic Sigma 250 (Gen III) greenhouse structure in a warehouse setting with shelves and boxes in the background.
Modern Sigma 250 (Gen III) greenhouse with transparent walls and a metal frame, surrounded by greenery.
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Sigma 250 (Gen III) Greenhouse in a garden with trees and flowers
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Sigma 250 (Gen III) greenhouse with a sliding door in an indoor setting
Arc-shaped Sigma 250 (Gen III) greenhouse with a person inside, surrounded by trees and greenery.
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Interior of a Sigma 250 (Gen III) greenhouse with curved walls and a door.
Sigma 250 (Gen III) greenhouse in a garden setting with trees and flowers
Metallic framed door for Sigma 250 (Gen III) greenhouses with a latch mechanism
Sigma Medium 20 (Gen III)
Partial view of a Sigma 200 (Gen III) greenhouse with a sliding door
Interior of a Sigma 200 (Gen III) greenhouse with shelves and a ladder.
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Sigma Medium 20 (Gen III)

Sigma Medium 20 (Gen III)

Approx Size: 8' × 20' × 7.5'

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.

  • Insulated Doors [NEW] – Helps reduce heat loss and drafts, creating a more stable growing environment and improving energy efficiency.
  • Upgraded Door Handles [NEW] – Smooth, reliable operation with a sturdy grip for easier daily access and long-term durability.
  • Aluminum Polycarbonate Trim [NEW] – Securely locks panels in place along the arch for added strength, better weather resistance, and a clean, finished look.
  • Window/Door Latch [NEW] - Makes the door and window open together.
  • Wind resistant up to 100 km/h for those living in gusty climates.
  • Comes with two doors (one at each end).
  • Withstands a snow load of up to 91cm (160 kg / m²)
  • Made with a heavy-duty galvanized pipe frame and 6 mm double-wall polycarbonate panels.
  • Arched shape - so the wind, snow, and hail just slide off the sides. 
  • Extendable beyond 30 metres - 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.
  • Access to our private Facebook group to connect with and learn from other greenhouse owners.
$3,900 CAD
$4,200 CAD Save $300 Sale $3,900 CAD
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Description Reviews Shipping FAQ

About Sigma Medium 20 (Gen III)

The Planta Sigma Medium 20 (Gen III) 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.

Sigma 2.5x6 (Gen III) greenhouse by Planta Greenhouses EU

Exact size: 98.4 x 89 x 237 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 Medium 20 (Gen III) greenhouse is extremely pleasant to work in throughout the day due to the end-to-end airflow and the distinctive 7.4' (2.26-metre) roof height.

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Up To 160 kg / m²
160 kg / m² is equal to 91cm of fresh snow layer or 46cm of 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 100 km/h
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Extendable & Customizable
This greenhouse can be extended with additional expansion kits
 
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Shipping

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. 

 

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