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Hoklartherm Riga XL 8 Greenhouse 14×26

$18,999.90$22,399.90

Add-Ons

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    Door Extension Kit for Riga XL Greenhouses

    $989.99

    Door Extension Kit for Riga XL Greenhouses The Door Extension Kit allows increasing your Riga XL greenhouse by 20 inches. You have to install your greenhouse kit on a stem wall. This reduces the need to construct a style to get over a raised door frame. Features & Benefits Anodized aluminum frame 10mm UV-coated twin-wall Polycarbonate […]

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    Solar-Powered Greenhouse Exhaust Kit

    $764.10

    Solar-Powered Greenhouse Exhaust Kit The Exhaust-Power Solar-Powered Greenhouse Exhaust Kit by Exaco will allow you the flexibility to keep your greenhouse cool and comfortable using solar power. The 50 watt foldable solar panel can be used flat or folded. It comes with included supports for various placement options.. This unique feature will allow for multiple […]

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    Shelving for Riga Greenhouses

    $194.31

    Shelving for Riga Greenhouses Additional shelving definitely means extra growing space by taking advantage of the greenhouse height. With the shelving for Riga Greenhouses, you can organize your plants and tools without overcrowding and cluttering. Design and proper planning are the keys to a productive greenhouse. Never waste space by adding shelves to your vertical […]

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    Dr. Infrared Industrial Heater

    $197.91

    Dr. Infrared Industrial Heater This convenient, portable industrial heater has a specially designed heating element and features a fan to provide continuous warmth. It circulates air throughout your greenhouse and heats a large area quickly and evenly without hot or cold spots. The built-in thermostat can be adjusted from low to high and is loaded […]

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  • Accessories *

Accessories

  • Watering *

    GrowMax Water Pro Grow 2000

    $378.00

    Two-stage water filtration for greenhouses of 200 sq. ft. and above, large community gardens, hydroponics, and home gardens

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    Greenhouse Misting System

    $139.46

    Greenhouse Misting System Do you want to cool down your greenhouse? Or are you growing tropical plants that need a higher humidity? Then the Greenhouse Misting System is a great choice! It can be installed in any greenhouse, which is up to 20ft in length. The Greenhouse Misting System itself is 14ft long but can […]

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    Genesis Drip Irrigation System

    $35.99

    Genesis Drip Irrigation System The Genesis Drip Irrigation System is created for gardeners and growers who are looking to conserve water consumption by delivering the right amount of water directly to the root system of plants. Each of the Genesis Drip Irrigation Systems is designed for specific projects to make it easier to select the […]

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  • Grow Lights *

    Astrica 45W LED Grow Light

    $24.30

    Astrica 45W LED Grow Light Create the best possible lighting environment for your greenhouse with the Astrica 45W LED Grow Light. These units are suitable for small or commercial greenhouse applications. The grow light provides flicker free lighting at a generous 110 degree wide angle. With an aluminum alloy body and plastic end caps, these […]

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    GENESIS LED Powered Grow Light System GL400

    $764.91

    The GENESIS LED Powered Grow Light System GL400 is one of the most powerful LED grow lights in demand today. With 256 high power LEDs, it easily replaces any 1000W or HID (High-Intensity Discharge) lights and produces a superior yield and higher quality flowers. The GL400 high power LED grow lights feature a simple plug-n-play installation. […]

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    GENESIS LED Powered Grow Light System GL600

    $989.91

    The GENESIS LED Powered Grow Light System GL600 is the most powerful LED grow lights on the business today. With 384 High Power LEDs, GL600 efficiently replaces any 1000W or HID (High-Intensity Discharge) lights. The GL600 high power LED grow lights highlight a simple plug-n-play installation. And, like the complete line of full spectrum LED lights, […]

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    GENESIS LED Powered Grow Light System GL1200

    $1,619.91

    The GENESIS LED Powered Grow Light System GL1200 is by far the most powerful LED grow light on the market today. With 768 High Power LEDs, the GL1200 efficiently replaces any 1000W or HID (High-Intensity Discharge) lights and provides a superior yield and higher quality flowers. The GENESIS LED Powered Grow Light System GL1200 highlights […]

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  • Heaters *

    RSI Radiant Propane Gas Greenhouse Heater

    $747.89

    RSI Radiant Propane Gas Greenhouse Heater If you are looking for an efficient heating system to deliver heat with infrared and radiant technology, look no further! The RSI Radiant Propane Gas Greenhouse Heater is a ventless, propane-powered unit that can be mounted to a wall or used free-standing on the included removable legs. The beauty […]

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    RSI Greenhouse Heating System

    $989.99

    RSI Greenhouse Heating System The RSI greenhouse and building heating system is designed to deliver a direct heat and allow for the temperature to be maintained over long periods of time. The ceiling-mounted design allows the heater to be used to maximize airflow. The design of the bracket also will allow the heater to be […]

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  • Growing *

    Riga Greenhouse Seed Trays

    $44.91

    Riga Greenhouse Seed Trays The Riga Greenhouse Seed Trays enable to efficiently grow your fancied plants on the shelves. It easily fits the Polycarbonate shelving. This maximizes your yield, as well as helps to put everything in order. Seed trays make starting seeds and transplanting with no difficulty.  Features & Benefits Heavy-duty Simply fits the Polycarbonate shelving […]

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    RSI Hydroponic Floating Seeding Tray

    $49.49

    RSI Hydroponic Floating Seeding Tray Enjoy the increased success rate of transplanting with RSI Hydroponic Floating Seeding Tray. The seeding tray from Riverstone Industries adds to the ease of growing plants from scratch. It is made from commercial-grade Polystyrene that will last for years. Choose from three different packages and grow from 128 to 242 plants per […]

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    Riga Stainless Steel Plant Hooks

    $38.25

    Riga Stainless Steel Plant Hooks The T-bolt head of the Riga Stainless Steel Plant Hooks inserts into the greenhouse profile channels without the need of a notched opening. Features & Benefits Adjustable length Set of 5 hooks Material: Stainless steel Dimensions: 3.5in long x 1.5in wide x 0.25in high

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    Riga Plastic Hooks for Growing Wire

    $38.61

    Riga Plastic Hooks for Growing Wire The Riga Plastic Hooks for Growing Wire or Rope easily fit in greenhouse channels. They use growing wire or rope for vining plants. These plastic hooks are excellent for attaching wires to sustain plants.  Features & Benefits Comes with small stainless steel S-hook Set of 10 plastic inserts and hooks Heavy-duty Excellent for […]

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    Plant Caddie Hook

    $40.49

    Plant Caddie Hook The Plant Caddietm by Riverstone Industries is the ultimate pulley system for your plants at home, on the balcony, or in a greenhouse. It allows you to raise and lower your hanging plants in a flash to water and care for them. A user-friendly pulley system with the only patented manual pull brake makes […]

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  • Misc *

    Riga Roof Window Wind Restraint System

    $25.56

    Riga Roof Window Wind Restraint System The Riga Roof Window Wind Restraint System protects your windows with auto-openers from powerful wind gusts that blow the vent open. Wind gust obstacles such as accidents, breakage or roof opener damages are minimized. This system has two 15in stainless steel cables with nuts and bolts. Good for one window.  […]

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    Wheelbarrow Access Ramp

    $189.91

    Wheelbarrow Access Ramp Make the entry into your greenhouse easier with the this access ramp. You can remove and carry it easily with the integrated handle. The Wheelbarrow Access Ramp is a great accessory for people who use wheelbarrows and dollies to transfer soil, pots, or other supplies often. Features & Benefits Make the entry […]

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    BOSS 399 Silicone Sealer

    $23.74

    BOSS 399 Silicone Sealer One of the best ways to keep warm air in your greenhouse is to ensure insulation is adequate. Sealing any cracks and air leaks is a must! BOSS 399 Silicone Sealer will close these areas, keep drafts off your plants, and maximize any heating elements you have in use. BOSS 399 […]

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    Potwheelz Garden Dolly

    $560.41

    Potwheelz Garden Dolly Potted plants need to be relocated from time to time especially when the weather changes. The Potwheelz Garden Dolly moves potted plants easier, faster and safer. It allows you to carefully move your potted plants from one spot to another with ease, reducing your risk of pain and damage to valuable pots […]

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Product

Additional Items

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Hoklartherm Riga XL 8 Greenhouse 14×26

Whether you are new to gardening or an experienced grower you may have been wondering about the best greenhouse for your plants. With Hoklartherm Riga XL 8 Greenhouse 14ft x 26ft, you can now have the perfect environment for your plants. This is all you need to set up a comfortable and safe atmosphere to start planting your crops. Add a charming and unique greenhouse to your garden. You now have the capability to eat fresh veggies and fruit well past the growing period.

The Riga XL 8 is a combination of durable materials and long-lasting hardware. Take note that it is by far the toughest greenhouse in the U.S. It is strong enough to produce vegetables, herbs, fruits, and flowers all the way through harsh winters and severe winds. Its 16mm triple-wall Polycarbonate is the thickest industrial quality material in the country. These types of greenhouses are intended to be used in cold weather. The roof has no shoulder and there is no ridge for the snow to build up on.

This onion-shaped greenhouse kit comes with larger and more windows than other greenhouses. The six roof windows work with automatic openers. The pistons are loaded with paraffin oil which opens and closes due to temperature fluctuations. It pushes the window wide open when it becomes hot indoors and closes the window when it cools down. No batteries or electricity is needed.

There are heavy-duty rubber seals that insulate any gaps, and additional silicone caulk that is applied to all the windows. The roof windows are attached with a “tongue and groove” hinge which crosses the full length of the top profile of the roof window.

This greenhouse has two oversized barn-style doors with a key lock. You can leave the top half open allowing a nice cross breeze. Add the optional Premium Kit to benefit from more accessories, such as shelving, grow lights, ventilation, and more.

Features & Benefits of the Riga XL 8 Greenhouse

  • Sturdy “onion”-shaped construction that withstands strong winds and snow
  • Frame material: Anodized aluminum frame
  • Glazing material/thickness (all four sides): Glazing on all four sides, 16 mm UV-coated TRIPLE-wall Polycarbonate
  • First-class insulation:
    • Heavy-duty rubber seals and silicone caulking to seal windows
    • High-quality construction with tightly fitted parts
    • R-value: 3.0
  • Door: 2x wide, heavy-duty Dutch barn-style doors with locks (37.5in wide x 74in high), one for the front and one for the back
  • Roof vents: 6x roof vents (37.5in wide x 39.5in long), with an automatic opener that works without electricity
  • Wind tolerance: 120 mph with 3-second gusts
  • Snow capacity: 30 PSF ground snow load
  • Included in the Riga XL 8 Greenhouse Kit:
    • Frame, glazing, rubber seals, and hardware
    • 6x roof vents with automatic openers
    • 2x barn-style doors
    • Assembly guide (also available here)
  • Optional add-ons and accessories: see details in the other tab
  • Rainwater gutter system: No (not possible because of the greenhouse shape)
  • Stem wall: Supported by manufacturer (need to order a door extension kit)
  • Expandable: No
  • Frame Color: Silver/Aluminum
  • Peak height: 9ft 10in
  • Floor space: 368 sq. ft.
  • Dimensions: 14ft wide x 26ft 3 in long x 9ft10in high
  • Assembly time:  Min of 4 people to assemble – approx. 2-3 days
  • Warranty:
    • Polycarbonate: 10 years (prorated after 5 years)
    • Frame: 15 years
  • Made in Germany
  • Shipping information: Greenhouse ships in 8 boxes, 7 of which are on a pallet and one 20ft box. This product is delivered via LTL which is curbside delivery only. The driver will be using a pallet jack and liftgate to slide the crate off and will need help from the customer with the unloading of the framing cartons. We recommend having a couple of people there for the delivery.

With a combination of strong materials and durable hardware, the Riga is by far the strongest greenhouse of its size under $10,000.

The Riga XL comes with 4 “L-shaped” anchor bars (which attach to the inside of the base profiles) to attach the greenhouse to a concrete or wood frame.

The Polycarbonate glazing on the Riga is German-made and believed to be of superior quality than the much more common Polygal or GE glazing.

Riga XL Pro Accessory Kit

Riga XL Pro Accessory Kit

This collection of optional accessories is the perfect way to upgrade any Riga XL Greenhouse. All of these accessories have been picked to be beneficial to plant growth and health.

Includes the following Accessories:

  • 1x Riga 6 Top & 1x table shelf (not pictured) – 19 ft long
  • 3 sets of professional LED Grow Lights
  • 1 – 24in in-take shutter vent
  • 1 – 20in exhaust fan
  • Thermostat to control vent & fan
  • 17,500 BTU 220 V heater
  • 5 heavy-duty seed trays
  • 10 stainless steel hooks & 10 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

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.

German engineering – guaranteed top quality!

The Riga is attractive and beautiful to look at – fits well into an upscale garden setting.

Buying a greenhouse is like buying a car, they vary in cost from cheap to very expensive, the Riga is a class similar to a BMW/Mercedes – stronger, more durable, and better insulated, and offers many more features than the better selling brands.

The Riga XL offers the maximum possible insulation currently available in a real greenhouse requiring the least amount of energy for its size: ~20,000 BTU (depends on your climate).

Comes with written assembly Instructions

Made in Germany

Features & Benefits

  • Sturdy “onion”-shaped construction that withstands strong winds and snow
  • Frame material: Anodized aluminum frame
  • Glazing material/thickness (all four sides): Glazing on all four sides, 16 mm UV-coated TRIPLE-wall Polycarbonate
  • First-class insulation:
    • Heavy-duty rubber seals and silicone caulking to seal windows
    • High-quality construction with tightly fitted parts
    • R-value: 3.0
  • Door: 2x wide, heavy-duty Dutch barn-style doors with locks (37.5in wide x 74in high), one for the front and one for the back
  • Roof vents: 6x roof vents (37.5in wide x 39.5in long), with an automatic opener that works without electricity
  • Wind tolerance: 120 mph with 3-second gusts
  • Snow capacity: 30 PSF ground snow load
  • Included in the Riga XL 8 Greenhouse Kit:
    • Frame, glazing, rubber seals, and hardware
    • 6x roof vents with automatic openers
    • 2x barn-style doors
    • Assembly guide (also available here)
  • Optional add-ons and accessories: see details in the other tab
  • Rainwater gutter system: No (not possible because of the greenhouse shape)
  • Stem wall: Supported by manufacturer (need to order a door extension kit)
  • Expandable: No
  • Frame Color: Silver/Aluminum
  • Peak height: 9ft 10in
  • Floor space: 368 sq. ft.
  • Dimensions: 14ft wide x 26ft 3 in long x 9ft10in high
  • Assembly time: Min of 4 people to assemble – approx. 2-3 days
  • Warranty:
    • Polycarbonate: 10 years (prorated after 5 years)
    • Frame: 15 years
  • Made in Germany
  • Shipping information: Greenhouse ships in 8 boxes, 7 of which are on a pallet and one 20ft box. This product is delivered via LTL which is curbside delivery only. The driver will be using a pallet jack and liftgate to slide the crate off and will need help from the customer with the unloading of the framing cartons. We recommend having a couple of people there for the delivery.

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.

Where do I find the assembly instruction?

Assembly manuals can be found here: Riga Manuals. You can also check out the assembly videos.

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.
  • 3 sets of professional LED Grow Lights
  • 1x  24in intake shutter vent
  • 1x 20in exhaust fan
  • 1x thermostat to control vent and fan
  • 1x 17,500 BTU 220 V 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

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!