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Best Hobby Greenhouse Reviews and Rankings
#1 Pick - Grandio Elite Review
#2 Pick - Juliana Premium
#3 Pick - Grandio Ascent Greenhouse Review
#4 Pick - Brighton Greenhouse Review
#5 Pick - Riga Greenhouse Review




Greenhouse Review Rating:
Finalist - #5 Pick

Average Customer Rating:
4 Stars


Our Greenhouse Review Panel says:
According to the manufacturer the Riga Onion series greenhouse is the absolute sturdiest hobby greenhouse available. We didn't have the advantage of being able to test in the extreme high winds that Riga has tested, but we certainly could find no reason to dispute their claims. If the Riga is anything it is a sturdy and durable greenhouse.

One of the biggest reasons for the Riga's extremely high wind and snow resistance is the most obvious - it's "onion" shape. As the picture shows, the Riga's are rounded on the sides coming to a point on top, which helps shed snow and lessens the effect of high winds. While this is a good feature to have from a strength standpoint, we were not as thrilled about the shape from an aesthetic standpoint. While the manufacturer states the onion shape is "beautiful", our unscientific poll of our review team was much more partial to the more traditional shapes of the Rion's and Juliana's. That's not to say the Riga's are ugly, we just as a whole preferred the looks of the other models we tested.

The size options for the Riga's are varied and, much like the Rion Hobby Gardeners and Prestiges, give a great range of lengths from fairly small to very large. They range from length of approximately 7' up to 17', and also have two width options of 7' or 9'. This means that just about any gardener can find a just right for them size. The heights of the Riga vary depending on the model from 7' to 7'6". Similar to the Juliana Premium, this is nice while you are standing in the middle of the greenhouse, but again we noted that we had to do more stooping inside the greenhouse than in the Rion Hobby Gardeners or Prestiges because of the way the roof slopes more severely from top to sides. If you are a taller than average gardener and work inside the greenhouse much, this can be a noticeable drawback to the Riga's and the Juliana Premium.

As for shipping, we hate to keep beating the same drum, but the Riga Onion's are similar to the Juliana Premiums as they are also shipped via LTL Freight. In case you didn't read the reviews on the Rion Hobby Gardeners and Prestiges, basically LTL Freight means the greenhouse is shipped on a flatbed truck instead of via a common carrier like UPS or Fedex. The reason for this is that the package size and/or weight is too much for common carriers.

Installation of the greenhouse was in a range that we would call moderate - more difficult than the Rions, but less difficult than the Juliana Premium. The instructions were fairly easy to understand and follow, but the greenhouse did require a few tools to install versus the Rions that snap together with no tools whatsoever required.

Similar to the Rions, the Riga has an optional base kit that can be used to secure the greenhouse to the ground. As with the Rions we would definitely recommend purchasing the base, although in this case you will be shelling out around $100 more for any of the Riga base kits than you would for comparable sized Rion base kits.

As for standard features, the Riga's come with roof windows, automatic roof window openers, and a hinged rear window. You can also purchase some shelving units that attach either at a standard shelf height (about hip level), or upper unit shelves that are more at eye level. We did like these shelving units and thought they were functional and attractive, although a bit on the pricey side.

Conclusion: The Riga Onion series is an extremely durable and well-constructed greenhouse. It comes in a nice range of sizes, both width and length, and was not overly difficult to assemble. We weren't thrilled with the looks of the onion shape, but if that is a style that suits your eye, then you can't go wrong with whichever size Riga you select. Also, be aware that the Riga's are approximately double the cost of the Rion Hobby Gardener (our #1 pick) per square foot.

Model: Onion Series (IIs, IIIs, III, IVs, IV, V)
Sizes: 7'x7', 7'x10', 9'x10', 7'x14', 9'x14', 9'x17'
Expandable: No
Frame: Aluminum
Panels: 8mm, 10mm Polycarbonate
Warranty: 10 Years Panels, 15 Years Frame
Shipping Method: LTL Freight
Quality of Construction: 9 of 10
Snow/Wind Resistance: 10 of 10
Colors Available: Silver
Assembly: Moderate


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 and is 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 Riga Greenhouse 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 doorframe 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).

  • Unique "onion" shape offers greater strength and resistance against wind and snow-buildup
  • No eaves or shoulders
  • 8mm UV-coated twin wall polycarbonate over main body
  • 10mm twin wall polycarbonate on front and back for added strength
  • Warranty of 10 years for the polycarbonate
  • Warranty of 15 years for the frame
  • Heavy duty Dutch door with keyed lock
  • Includes oversized, hinged, rear wall window
  • Includes automatic window opener
  • One of the sturdiest hobby greenhouses available

Starts at $2329.00 See Riga Greenhouses at
Starts at $2329.00 See Riga Greenhouses at
Starts at $2329.00 See Riga Greenhouses at

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