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Riga IVs The Onion Greenhouse

The Onion's design gives this greenhouse great strength and superior ventilation. It also resists snow buildup and wind, making it a great choice for harsh winter climates. Constructed of high grade polycarbonate and aluminum, the Onion will bring years of growing enjoyment. Riga greenhouse kits include large windows and roof vents for excellent performance during hot summer months.

Our Price: $4,199.00
Warranty: Frame: 15 years; Glazing: 10 years
Stock #EXA-RIGA-IVs

Size: 14'L x 7'8"W x 6'11"H
Frame: High Strength Aluminum Frame
Cover: 8 MM UV coated twin wall; 10 MM endwalls

Usually ships within 5 days

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FREE Shipping does not apply to this greenhouse - We custom quote shipping costs to SAVE YOU $$
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Secure Your Greenhouse - We Recommend adding the Eagle One Ground Anchor System



The RIGA is truly a greenhouse by the European definition of a greenhouse. Designed, engineered, and manufactured in Germany by Hoklartherm, a leading manufacturer of commercial and hobby greenhouses with 28 years experience. The Riga backyard greenhouse has a beautiful "onion-shaped" design, as well as being one of the sturdiest hobby greenhouses on the market. One major advantage of the Riga's construction method is that the frame profiles are permanently attached to each other, and won't come loose over time due to wind pressures. The "onion" has no eaves or shoulders giving it significantly less wind resistance.

The Onion has been tested against winds up to 100 miles per hour and has never been blown away (when properly anchored to the ground). No eaves also means no significant snow build up! This is not only attractive but aids in shedding snow loads. The Riga Hobby Greenhouse comes standard with 8mm polycarbonate on the roof and sidewalls and 10mm twin wall polycarbonate on the endwalls. No other hobby greenhouse kit on the market comes standard with this kind of insulation.

The heavy duty lockable Dutch door offers increased ventilation options while preventing the unwanted access of animals and pests. The door frame is a wide 29.6 inches, more than wide enough to drive a standard wheelbarrow through.   The Riga Series is the only greenhouse with an oversized, hinged, rear wall window at 42" tall and 30" wide and an oversized roof window 40" wide and 24" deep (equivalent to 2 regular size roof windows).


The Riga "Onion" Greenhouse Kit includes (1) roof vent, (1) large rear wall window, and (1) Dutch door.

10 year warranty on covering and 15 years on the frame! 
The Riga is by far the strongest greenhouse under $5,000.

It is all possible with a RIGA greenhouse.

The Riga Greenhouse kit includes:

  • 2 Roof windows with automatic openers
  • 30" wide Dutch barn style door
  • Oversized rear wall window
  • 8 MM UV coated twin wall polycarbonate over main body
  • 10 MM twin wall polycarbonate in front & back walls for extra strength
  • More window and door ventilation than any other kit in its class
  • Attractive and beautiful to look at
  • The minimum insulation needed to grow  plants year-round
  • RIGA units are available in 5 sizes
  • Many options to suite your growing needs
  • Download the Assembly and Users Manual
  • Assembly DVD is included with all Riga greenhouses!

Greenhouse Installation Service

Get your Riga, Victorian or Orangerie installed by professional installers almost anywhere in the contiguous USA.

Let the Pros do it for you.
Let trained professionals assemble and install your beautiful new greenhouse! From inspecting the job site, to assembly, to final inspection, you can count on a hassle free, top quality, and fully warranted installation. You can rest assured that the independent contractor will provide top quality service and support your peace of mind. click installation form and more information

How the service works?
Once you've decided on the service that is right for you and after submitting a request, a trained professional will conduct a full research on your project then contact you with the details free of cost. Only when you have fully agreed to the service details, our sales associate will create a complete order for your project or if it is required, assist you in purchasing a pre-assembly on-site inspection. click for installation form and more information

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