For those of us who love to get our hands dirty in the garden, there’s nothing more frustrating than having to hang up our gloves when the first frost hits. That’s where the Riga XL Greenhouse comes in – a game changer for gardeners living in cooler climates who are tired of the short growing seasons. With its thick 16mm triple-wall Polycarbonate panels and solid gothic arch design, this greenhouse keeps the cold at bay, giving your plants a cozy, protected space to thrive all year round. No more calling it quits when winter rolls in; with the Riga XL, you can keep growing your favorite veggies, fruits, and flowers, regardless of snow or wind outside.
It’s the perfect solution for those of us who aren’t quite ready to give up the garden just because the calendar says it’s winter.
With its hefty 16mm triple-wall Polycarbonate panels, the Riga XL isn’t just tough; it’s like giving your plants a winter coat that blocks out the cold but lets in all the sunlight they crave. This isn’t your typical, flimsy season-extender. It’s a full-blown, all-season greenhouse that keeps the chill out and warmth in, so you can keep those tomatoes and orchids happy year-round.
Build tough, sealed tight: This strong aluminum frame braces itself against anything the weather can throw at it, from gusts to heavy snow. But there’s more: wedge seals between the frame and glazing for that extra snugness and warmth, making the Riga XL not just sturdy, but a fortress for your plants.
Smart Design for Smart Gardeners
That gothic arch isn’t just for looks. It’s shaped to make sure snow doesn’t stick around, sliding right off instead of piling up. And wind? It just seems to glide over and around, leaving your plants undisturbed. Plus, the height and variety of sizes mean you can grow everything from your basic herbs to ambitious fruit trees. Want to elevate things a bit? Add a stem wall for even more growing room.
Access and Air, Simplified: Those heavy-duty Dutch Doors at both ends make getting in and out with wheelbarrows or big pots a breeze. And with roof vents that open themselves when it gets too warm, you’ve got a climate-controlled environment that’s hands-off, ensuring your plants get fresh air without any fuss from you.
Everything You Need in One Package
Getting your garden started with the Riga XL is a breeze because we pack everything you need right in the box. From the sturdy frame that’s built to last through the seasons, to the crystal-clear panels, and the self-regulating vents that keep things cool without needing a plug, it’s all included. But why stop there? For those looking to really boost their gardening game, we’ve got the optional Pro Accessory Kit.
This kit is a powerhouse of tools designed to maximize your greenhouse’s potential. It packs professional LED grow lights, a thermostat-controlled ventilation system for automatic climate control, and robust shelves that can carry heavy loads without a hitch. Plus, with a 220V electric heater, it ensures your garden remains the ideal home for your plants throughout the seasons. So, while the greenhouse itself comes with everything you need to get started, the Pro Accessory Kit is there to take you to the next level.
Invest in Durability, Reap Vibrant Gardens
Forget about durability concerns with the Riga XL Greenhouse. Engineered to endure, it stands strong against winds up to 120 mph and heavy snow loads, while its top-notch UV-protected polycarbonate panels ensure clarity and strength for years to come. By choosing the Riga XL, you’re investing in a future of lush, vibrant gardens. With solid warranties and a design that lasts through the seasons, it’s the smart choice for serious gardeners.
So, let’s not let a little cold weather keep us from doing what we love. With the Riga XL Greenhouse, we’re not just extending the growing season; we’re making every day a perfect day for gardening. Ready to transform your gardening game and enjoy a bounty of greens, colors, and flavors all year round? The Riga XL is here to make that dream a reality.
Made in Germany with 30 years of experience!
The Riga XL 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.
Watch this video to get some assembly tips for a Riga Greenhouse!
Riga XL 5 Greenhouse
Riga XL6 Greenhouse
Riga XL7 Greenhouse
Riga XL8 Greenhouse
Riga XL9 Greenhouse
Example of setting up a Riga XL with a sunken floor to reduce heating cost & increase height:
Product Details
Sturdy gothic arch shape construction that withstands large amounts of snow and strong winds
Glazing material: 16 mm UV-coated TRIPLE-wall polycarbonate
First-class insulation:
Heavy-duty rubber seals and silicon caulking to seal windows
High-quality construction with tightly fitted parts
R-value: 3.0
Door: 2x wide, heavy-duty Dutch Doors with locks (37.5″ x 74″), one for the front and one for the back, providing two large access points for equipment and additional airflow
Roof vents (40″ wide x 24″ long) come with an automatic opener that works without electricity
Included in the Riga L Greenhouse Kit:
Profiles, glazing, rubber seals, and hardware
2x Dutch Doors
Roof vents with automatic openers – number depends on model:
Rainwater gutter system: No (not possible because of the greenhouse shape)
Stem wall: Yes, up to 20″; need to order a Door Extension Kit
Expandable: No
Specifications
Frame material: Smooth finished anodized aluminum
Frame color: Aluminum/Silver
Height: 9′ 10″
Dimensions:
Riga XL 5: 14′ wide x 16’5″ long
Riga XL 6: 14′ wide x 19’1″ long
Riga XL 7: 14′ wide x 23′ long
Riga XL 8: 14′ wide x 26’3″ long
Riga XL 9: 14′ wide x 29’6″ long
Floorspace (in sq.ft.):
Riga XL 5 (14×16): 231
Riga XL 6 (14×19): 280
Riga XL 7 (14×23): 322
Riga XL 8 (14×26): 368
Riga XL 9 (14×30): 413
Assembly time: Min of 4 people – approx. 2-3 days, with 4 people – approx. 6-8 hours
Warranty:
Polycarbonate: 10 years (prorated after 5 years)
Frame: 15 years
Made in Germany
Optional Accessories
Pro Accessory kit:
1x top and 1x bottom shelf: Riga shelves are designed to carry a high load. The bottom shelf can hold a 160-pound man, so it will hold your pots easily. Note: You’ll have to cut the shelving to fit into XL7 & 8.
3 sets of professional LED Grow Lights
1x 20″ exhaust fan
1x 24″ intake shutter vent
1x thermostat to control vent and fan
1x 17,500 BTU 220V electric heater
5x heavy-duty seed trays
10x stainless steel hooks and 10x heavy-duty plastic “hooks”
Assembly Facilitation Kit: 25′ metric tape measure, 10mm socket wrench, 10 mm open wrench, 2 20′ J-hook ratchet straps, window restraint cables, 2 tubes Boss 399 silicone caulk, permanent marker
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.
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.
Additional Accessories
Riga XL Pro Accessory Kit
This set of accessories is a great way to improve any Riga XL Greenhouse. Each of these accessories will be helpful to plant growth and health.
Includes the following accessories:
1x top and 1x bottom shelf: Riga shelves are designed to carry a high load. The bottom shelf can hold a 160-pound man, so it will hold your pots as well.
10x stainless steel hooks and 10x heavy-duty plastic “hooks”
Assembly Facilitation Kit: 25′ metric tape measure, 10mm socket wrench, 10 mm open wrench, 2 20′ J-hook ratchet straps, window restraint cables, 2 tubes Boss 399 silicone caulk, permanent marker
Add-Ons
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. Here is a link to the foundation frame for more details.
Door Extension Kit
You only need this if you want to build your greenhouse on a stem wall (foundation wall). It essentially adds a piece of Polycarbonate above the door in order to close it off when the door is installed on ground level (check photo to get a better idea). Here is a link to the Door Extension Kit.
Shelving
You can add a wide bottom shelf and a narrower top shelf on each side of your Riga greenhouse. This will bring the plants to a comfortable level and it keeps you more organized. You can learn more about these products here!
Exaco Exhaust Fan & Intake Shutter Vent
Get more air flowing through your greenhouse with this exhaust fan & intake shutter vent combo. It is part of the Riga XL Pro Kit but you can add it on if you didn’t choose the Pro Kit. For more product details, click here!
Dr. Infrared Industrial Heater
This heater is made for large greenhouse, such as Riga XLs. It produces approximately 18500 BTU at maximum power. This industrial heater is part of the Riga XL Pro Kit but can be added separately if you didn’t choose that option. You can find more details about the Dr. Infrared Heater here!
Other Riga Accessories
There are plenty of other accessories that you may want to add to your order. We would just advice you to think about if you really need it for your specific circumstances. Not every accessory is needed to successfully grow your own produce.
Wind Restraint System for Roof Vents
This nifty little add-on will keep your automatic openers save on stormy days. We do recommend it to people who experience storms often, especially if you don’t have many wind breaks in your garden. The automatic roof vent openers work with the indoor temperature. So, they may open even if it’s very windy outside. Therefore, it is wise to secure the vent. Check it out here!
Seed Trays
If you want to use the shelving for seed starting and you don’t want to use individual pots, you can get these seed trays. They fit perfectly on the shelf. Check them out here!
Greenhouse Misting System
A misting system cools down the greenhouse on hotter days. It also takes away the task of watering frequently (you still may need to manually water certain plants). However, you may not need it if you don’t have hot summers and if you are growing plants that don’t do well with overhead watering. Check out the misting system here!
Plant Hooks
If you want to utilize hanging pots or plant wires, these hooks may be beneficial to get. They attach to the greenhouse frame with a T-bolt head. Check them out here!
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