If you’re after a greenhouse that gives you plenty of space not just for plants but for your garden tools, and maybe even a cozy spot to relax or a unique pool enclosure, check out the Riga L Greenhouses. These aren’t your average greenhouses; they’re like an extra room out in your garden. With their unique gothic-arch design, they offer lots of headroom and smart features. It’s a perfect year-round home for your plants and a great space for you to enjoy your garden to the fullest.
Sizes for Every Space
Offered in three spacious dimensions, the Riga L is tailored for gardeners seeking more room to grow without overwhelming their outdoor space. While larger than the Riga S, the Riga L maintains an efficient use of space, ensuring a rich, expansive environment for a diverse range of plants without sacrificing aesthetics or functionality.
Riga 3 (10×11)
Riga 4 (10×14)
Riga 5 (10×18)
Crafted with the distinctive “onion” or “bell” shape, the Riga L is designed to maximize headroom, allowing taller gardeners to move freely without the need to stoop. This ergonomic design not only enhances the gardening experience but also provides ample space for additional shelving and the growth of climbing plants.
Durability Meets Design: The Riga L features a gothic-arch shape that prevents snow and wind from gaining a foothold. This design ensures snow easily slides off and strong winds are smoothly redirected.
This design, coupled with frame profiles that are thicker and of larger diameter than typical greenhouses, provides unmatched structural integrity against the elements.
Superior Materials for Supreme Insulation
With sidewalls featuring 8mm UV-coated twin-wall polycarbonate and gables of 10mm thickness, the Riga L offers exceptional insulation, outperforming even the glass windows of a home. This superior insulation is further enhanced by heavy-duty rubber seals and weather seals around the windows, achieving an impressive R-value of 2.0.
The varying thickness of the polycarbonate serves a dual purpose. The thinner 8mm polycarbonate on the sidewalls allows for more light transmission, crucial for the growth and health of plants, especially in the higher latitudes. Meanwhile, the thicker 10mm polycarbonate on the gables provides added durability and strength, ensuring the greenhouse can withstand harsh weather conditions.
Additional Features & Benefits
Easy Access & Superior Airflow: Featuring a wide Dutch Door for easy access, secured with a key-lock handle. By opening the top of the Dutch Door along with the large rear wall window, it creates an efficient airflow system throughout the greenhouse.
Automatic Roof Vent: Facilitates air circulation without the need for electricity.
Robust Construction: The Riga L is crafted with an anodized aluminum frame featuring a smooth finish for durability. It is enhanced by stainless steel connectors and angles that will not rust or corrode, ensuring long-term resilience. Additionally, the frame profiles are designed to interlock securely, preventing them from coming loose over time due to wind pressures.
Optional Accessories: Elevate your Riga L experience with a selection of optional accessories, including a 6” high foundation frame for easy installation without the need for concrete, a premium kit for additional enhancements, and a door extension kit for increasing the height by setting it up on a stem wall.
Designed for serious gardeners who cherish quality and efficiency, the Riga L Greenhouse stands as the pinnacle of robust greenhouse design. Its exceptional insulation and innovative features set it apart as the strongest greenhouse of its size.
Watch this video to get some assembly tips for a Riga Greenhouse!
Made in Germany with 30 years of experience!
The Riga L Greenhouses are manufactured by Hoklartherm, a renowned German brand with over 3 decades of greenhouse crafting experience. They specialize in greenhouse designs for challenging climates. With a greenhouse made by Hoklartherm, you can rest assured that it will last you for decades.
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The Riga 3 Greenhouse: A Closer Look
The Riga 4 Greenhouse: A Closer Look
The Riga 5 Greenhouse: A Closer Look
Product Details
Sturdy gothic arch shape construction that withstands large amounts of snow and strong winds
Rainwater gutter system: No (not possible because of the greenhouse shape)
Stem wall: Supported by the manufacturer (up to 20″; need to order a Door Extension Kit)
Expandable: No
Specifications
Frame material: Smooth finished anodized aluminum
Frame color: Aluminum/Silver
Height: 7′ 7″
Dimensions:
Riga 3 (10×11):9′ 8″ wide x 10′ 6″ long
Riga 4 (10×14):9′ 8″ wide x 14′ long
Riga 5 (10×18):9′ 8″ wide x 17′ 6″ long
Sidewall height (curve): 6′ 1″ high near shelves
Assembly time: Min of 3 people – approx. 1-2 days, with 4 people – approx. 6-8 hours
Warranty:
Twin-wall polycarbonate: 10 years (prorated after 5 years)
Frame: 15 years
Made in Germany
Optional Accessories
6” high foundation frame: If you add this, you don’t need a concrete or wooden footer. This foundation frame will attach to the bottom of the greenhouse frame and goes into a trench in order to anchor the whole greenhouse.
Premium kit: Includes the foundation frame, 10″ deep top shelf (attached to greenhouse side), and 25″ deep regular shelf
Door extension kit: Set your greenhouse on a 20″ stem wall. This kit gives you the missing pieces of polycarbonate (+ profiles) that go above the doors.
FAQs
Assembly & preparation
Does the Riga come with a base/foundation frame?
No. You can either purchase the foundation frame separately or purchase the premium kit that also includes shelves for just a little higher price.
What foundation/ground/footing do you recommend?
There are plenty of options for you to prepare the ground before setting up the greenhouse. If you choose to purchase the foundation frame, you don’t need a foundation. You only need to level the ground and add material of your choice. We usually recommend gravel, dirt, or pea rock. The foundation frame will go into a trench to provide more stability. For more details and more foundation options, please read the Riga XL Reference Manual (page 30ff, measurements are for Riga XL VI).
Do you recommend a cement foundation?
Cement foundations hold a lot of heat in the summer and a lot of cold in the winter. Therefore, we do not recommend a concrete slab. You can, however, build a concrete footing (like a stem wall that is flush with the ground) and fill the inside with gravel, dirt, or pea rock. You can also add the foundation frame as an additional accessory. This will work without a concrete foundation or footer.
How long does the greenhouse take to assemble?
Assembly time depends upon the number of people assisting, how many shelves are added, if a foundation frame is added, and on personal assembly skills. The assembly time takes from 6 hours to a day (or more) depending on these factors and does not include ground preparation time.
Can the Riga be assembled in the winter, as in can the panels handle being “bent” during assembly when they are cold?
Yes, but everything will be stiff. It is recommended to keep the panels inside (warm) and only bring them out when needed during the assembly process.
Accessories
How does the automatic window opener work without electricity?
A special cylinder filled with paraffin oil expands and contracts in response to temperature changes. This pushes the window open when it gets hot inside and closes the window when it cools down. The temperature range is adjustable.
Can I install an electric fan?
Yes, simply cut the required hole with a utility knife in the polycarbonate glazing either in the back or front walls. No fan is included with Riga greenhouses but it can be added additionally.
What is the weight capacity for the Riga shelving (9″ and 15″)?
The shelf strength depends on the frame. If the frame that the shelving is attached to is too weak, the frame will bow outwards. In the Riga, 150lbs is about the maximum weight capacity.
Is a shade cloth required?
This is dependent on what you plan to grow. If you are planning to use the greenhouse to grow and house exotic plants during daytime temperatures in excess of 85-90º F, virtually any greenhouse will need some kind of shade cloth and or misting system in order to keep temperatures down.
Do Riga Greenhouses need a heat source for the winter?
The more plants you have, the more heat they will produce. So, it depends on how many plants you are planning to grow. In addition, it depends on what type of plants you want to grow, i.e. kale grows in cool temperatures, whereas tomatoes need more warmth. There might be times that the temperature may drop significantly for longer periods. Although the Riga provides great insulation, you have to decide whether you need a heater or not according to your own needs.
What heaters do you recommend?
This highly depends on the size of the greenhouse and how you want to use your greenhouse in winter. We offer some heaters here, but you may just check out a local hardware shop that provides more options. If you want to learn more about greenhouse heaters, read this guide first.
Structural questions
What is the snow rating of the Riga L and XL series?
The roof of the Riga greenhouses has no “shoulder” or ridge for snow to accumulate. Snow and debris simply slide down the roof. The Riga L & XL can withstand 30 PSL ground-snow load. In the event of continuous heavy snowfall, remove snow from the base of the greenhouse, creating a trench. This will allow new snow to slide off easily and not block sunlight from the sides and roof of the greenhouse.
What is the wind resistance rating?
Due to its unique roof slope, strong winds are diverted over the roof of the Riga greenhouses. Additional wind resistance is provided through the 4 lateral support bars, which span from the front to the back of the greenhouse. The Riga L & XL is adequate to support 120 mph of wind (three-second gusts).
Can the units be enlarged later if I need to expand the greenhouse?
No, they cannot. The roof beam and base profiles are one piece and cannot be extended.
Do the Riga greenhouses require maintenance?
No routine maintenance is required. It is recommended to check annually that all nuts, bolts, and screws are still tight.
Which side of the Riga Polycarbonate panels has UV coating?
The UV coating is applied directly to the Polycarbonate and is invisible. The side with the UV coating has a plastic covering applied. The covering is a WHITE or CLEAR film that has writing on it. The writing will say “UV Protected”, “UV Coated”, “UV” or a symbol of the sun. The kit should be assembled with the UV-coated panel facing toward the sun. If the writing is on both sides of the panel, both sides have been treated with UV coating. If the Polycarbonate film is BLUE or has the word “Plexotec” written on it, both sides have a UV coating.
Shipping
Where does this ship from?
Austin, Texas
Do you deliver to the house?
This product is delivered via LTL which is curbside delivery only. You will need to work with the driver to unload the contents of the crate, leaving the crate on the truck. The exception would be if you have a forklift or tractor with long forks available, which can be used with the liftgate to lower the entire crate to the ground. We recommend having a couple of people there for the delivery.
How long does it typically take for the shipment to arrive?
It usually takes about 2 weeks for your order to arrive. This unit ships from Texas. It takes 1-2 business days to package and then it ships to the shipping facility located nearest to you. The shipper then makes contact to schedule a delivery. Due to the high demand during this pandemic, we are running low on products, and shipping companies take longer than usual. Please, keep this in mind when ordering. We will send you a follow-up email if there is a longer waiting time for your order.
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