Sigma Greenhouse Gen II

Spacious Backyard Kits, 10 ft Wide

4.7 · 90 reviews
Save $300
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II
Sigma Greenhouse Gen II

Sigma 20 (Gen II)

Sigma Gen II greenhouse kits are arched backyard greenhouses rated for 32 psf of snow and 65 mph wind, with 6 mm twin-wall polycarbonate panels and a 5-year warranty. They're for sale in 4 sizes, all 10 ft wide, so you can choose the length that fits your space. Find your greenhouse.

Size: Sigma 20 (Gen II) · 10′ × 20′Size guide
$3,050$3,350Save $300

Free shippingTo nearest terminal
5-year warrantyFrame & panels
Pre-cut panelsFor easier installation
Guided assemblyVideos and live chat
Questions? Talk to a grower.

Mon–Fri 9am–5pm EST or Send a Message

Call us1-877-669-1286

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Which size is best for your garden?

Get this sizing guide with photos and bed layouts.

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  • 32 psf snow load – Withstands a snow load of 160 kg/m², ideal for areas with moderate snowfall.
  • Wind resistant up to 65 mph for those living in gusty climates.
  • 5-year warranty because our greenhouse is heavy-duty and long-lasting.
  • Made with a heavy-duty galvanized pipe frame and 6 mm twin-wall polycarbonate panels.
  • Arched shape - so the wind, snow and hail just slide off the sides.
  • Comes with two doors (one at each end) and two manual windows.
  • Extendable beyond 100 ft - so you can expand your greenhouse when you're ready.
  • Maintenance-free means you have more time to focus on your garden.
  • Access to our private Facebook group to connect with and learn from other greenhouse owners.
  • The Sigma Greenhouse Gen II is available in 4 size configurations. Plus, you may purchase an extension kit, to extend the length of the greenhouse.
  • Extendable & Customizable
  • Snow Load Up To 32 psf 
  • Wind Resistant up to 65 mph
  • 5-year warranty because our greenhouse is heavy-duty and long-lasting.

Sigma 20 ships in these boxes:

  L, (in) W, (in) H, (in) Weight, (lbs) Quantity
Sigma Base 1 80 11 4 93 1
Sigma Base 2 78 24 3 93 1
Sigma Polycarbonate Base 82 44 4 58 1
Sigma Extension 78 21 3 63 1
Sigma Polycarbonate Extension 82 44 2 31 2
      Total weight: 338  

 

Planta Greenhouses is dedicated to deliver your order promptly, so you can begin using your greenhouse products right away.

Because greenhouses are packaged in large boxes, they have unique shipping requirements. 

  • We offer Free shipping to nearest terminal in USA. Shipping to the house is quoted on the checkout page. Deliveries to remote areas may cost 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.
  • We will make every effort to ship your order in the best, fastest and most economical way. We are not responsible for delayed delivery due to conditions beyond our control.
  • We do not ship to PO Boxes, as in most cases you will need to sign for your item. 
  • White glove delivery service isn't available. The greenhouse components are delivered in multiple boxes, the largest of which weighs 84lbs. The greenhouse will be delivered to your driveway. Please make arrangements to have the package moved to its installation location. 
  • Orders placed on weekends and public holidays will be processed the next business day.

 

Free guide

The Beginner's Guide for Greenhouse Owners

Tell us where to send it and it's yours.

Sigma Greenhouse Gen II Measurements

Sigma 20 (Gen II) · 10′ × 20′

3D view
Side view

Compare Sigma Greenhouse Gen II Sizes

This greenhouse comes in several size configurations. Every greenhouse extends in 6.5 ft sections, so pick the length that fits your plot and your plans.
Sigma Greenhouse Gen II Sigma Urban (Gen II)
10′ × 13′
Sigma Greenhouse Gen II Sigma 20 (Gen II)
10′ × 20′
Sigma Greenhouse Gen II Sigma 26 (Gen II)
10′ × 26′
Sigma Greenhouse Gen II Sigma 32 (Gen II)
10′ × 32′
Price
Sale$2,650
$2,450
Sale$3,350
$3,050
Sale$4,100
$3,700
Sale$4,850
$4,350
About
Beds along both sides and a bench for seed trays: room for a full season of tomatoes and peppers.
Room for in-ground beds, trellised crops and a potting bench.
Long beds on both sides, tall crops at one end and a wheelbarrow-wide path.
Several crop zones, a propagation corner and space for a heater.
Width
10 ft width
10 ft width
10 ft width
10 ft width
Length
13 ft length
20 ft length
26 ft length
32 ft length
Height
7 ft height
7 ft height
7 ft height
7 ft height
Sq ft
130 sq ft
200 sq ft
260 sq ft
320 sq ft
Owner reviews
4.7 Read all 90 reviews
Read all 90 reviews
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Dome-shaped Greenhouse
About this model

Dome-shaped Greenhouse

Sigma Gen II greenhouse has a dome-shaped arch which sheds snow and rain, and the galvanized pipe frame with 6 mm twin-wall panels is rated for 32 psf of snow.

pg why planta
Why Planta Greenhouses

Greenhouses that outlast the winters

Heavy-duty kits since 2013, designed for Canadian and northern-US winters and backed by a 5-year warranty, live-chat support and thousands of owners sharing what works.

pg shipping boxes
Shipping & assembly

Arrives in labeled boxes

Free shipping to the closest terminal in the lower 48. Every panel is pre-cut and every bag of hardware is labeled, so two people can build it with the step-by-step videos.

Questions? Talk to a grower.

Mon–Fri 9am–5pm EST or Send a Message

Call us 1-877-669-1286