Due to current supply chain constraints, all Hoklartherm greenhouses are in very limited supply at this time.
As an authorized dealer, we're accepting pre-orders if an item is out of stock. Please check with us before ordering to get the most accurate shipping schedule.
The commercial-grade Riga XL 9 from Hoklartherm, the leading builder of premier greenhouses in Germany, is a beautiful addition to any garden. Its spacious 14X29 interior gives you space for anything you decide to grow, and many customers use it as an outdoor sunroom or even for a hot tub or indoor pool enclosure.
The peak height of ten feet allows room for tall plants and growing trees, and there is sufficient interior space for the most avid gardeners. The heavy duty frame is made of reinforced aluminum and the unique "onion" design allows the greenhouse to withstand inclement weather with ease. Nothing short of tornados or hurricanes has ever destroyed a Hoklartherm Riga Greenhouse.
The Riga XL 9 includes six roof windows, all of which have automatic openers to help keep the interior well-ventilated and at a comfortable temperature. The lockable, Dutch doors on each end provide easy access and are designed for quick installation.
The best in class 16mm triple-wall polycarbonate panels provide maximum insulative value and safety. They are extremely durable and are virtually unbreakable and provide three times the efficiency in terms of heat conductivity of even 8mm twin-wall polycarbonate. Gutters are not needed as the Riga's unique design naturally diverts water away from the foundation.
Despite its large size, the greenhouse can be assembled in as little as a weekend depending on how much help you have. The process can be sped up if the site of assembly is prepared ahead of time by leveling it and installing whatever type of flooring and foundation is preferred.
The Riga XL 9 is the type of premium greenhouse which adds to the value of your home. It can serve multiple purposes and its superior build quality ensures that it will stay looking new long after it is assembled. With its durability, attractive design, and spacious interior, the Hoklartherm Riga XL 9 Greenhouse is sure to become a showpiece for your family for many years to come.
- Model: Riga XL 9
- UPC code: 017783306007
- Nominal size: 14' width x 29' length
- Exterior dimensions: 14' 2" width x 29' 6" length x 10' peak height
- Color: anodized aluminum with smooth finish
- Floor space: 413 sq. ft.
- Roof windows: 6 large 37.5" width x 39.5" length vents, all with temperature-adjustable, electricity-free automatic openers
- Best in class 16mm triple-wall polycarbonate panels are UV-protected, have a R-value of 2.5 and K-value of 2.3 (three times more efficient than even 8mm twin-wall polycarbonate), and are virtually unbreakable
- Heavy duty aluminum frame is greatly sloped with a high peak to allow rain and snow to easily run off and can easily support the weight of an adult
- Frame profiles are thicker than comparably priced structures for added strength
- Constructed so that the frame profiles are attached to each other in a manner that ensures that they will stay intact even in high winds
- High ratio of paneling to frame width allows for maximum light trasmittance and less "moving" shade
- Heavy duty rubber seals are used on all windows, doors, and the top and bottom of the large side glazing panels for complete weather sealing
- Two strong Dutch doors on each end with wide openings for easy access and maximum ventilation; both doors include keyed handles and are 37.5" width x 74" height
- Tall peak height allows for plenty of working room inside the greenhouse without having to stoop and more room for shelving
- Gutter and downpipes are not needed because of the unique frame design
- Beautiful design to fit any garden
- Includes 4 L-shaped anchor bars which attach to the inside of the frame base profiles to attach the greenhouse to a concrete or wood frame
- Riga greenhouses have withstood all inclement weather when properly installed and anchored short of tornados and hurricanes
- Note: Some images may not be to scale or may show the greenhouse with the optional accessories or items such as flowers or tables or chairs which are not included
- Note: Please be sure to check your local building code for any required permits
- All Hoklartherm greenhouses are special ordered by Exaco and individually inspected and packed with a 1 to 4 week lead time depending on inventory levels and so returns are expensive; please let us know if you have any questions at all
- Designed, engineered, and manufactured by Hoklartherm, the top maker of premium greenhouses and outdoor pavilions in Germany
- Imported by Exaco Trading Co. and shipped from their Austin, TX warehouse
- Includes comprehensive assembly manual along with a DVD showing each stage of assembly
- Assembly usually takes just one weekend with two people (three is preferable) with ordinary household tools as there are no eaves and relatively few connections
- Maintenance-free design means the Riga only needs occasional washing with a garden hose and recommended annual tightening of all nuts and bolts
- Friendly toll-free technical support available from Exaco for installation help
- Ships in eight carefully packed and inspected boxes via ground freight, seven on one pallet and one 20' long tube
- Box 1 (straight profiles - aluminum): 234" x 8" x 8 " at 180 lbs., Box 2 (parts and rubber seals): 14" x 14" x 15" at 18 lbs., Box 3 (curved profiles - aluminum): 144" x 3" x 4" at 21 lbs., Box 4 (curved profiles - aluminum): 144" x 8" x 4" at 85 lbs., Box 5 (straight profiles - aluminum): 168" x 8" x 8" at 100 lbs., Box 6 (straight profiles - aluminum): 108" x 8.5" x 7.5" at 102 lbs., Box 7 (triple wall Lexan glazing): 154" x 39" x 6" at 180 lbs., Box 8 (triple wall Lexan glazing): 154" x 39" x 6" at 180 lbs.
- Shipping weight: ~1000 lbs.
- Exaco and Hoklartherm and Greenhouse Nation stand by their greenhouses and work to make you completely satisfied
- 15 year limited warranty on frame and 10 year limited warranty on polycarbonate, prorated after 5 years
Assembly Facilitation Kit - The Riga XL Assembly Facilitation Kit from Hoklartherm contains all the tools and supplies you need for a smooth installation of your Riga XL greenhouse. The kit includes 25' metric tape, a 10mm socket wrench, a 10 mm open wrench, two 20' J-hook ratchet straps, four window restraint cables, two tubes of Boss 399 silicone caulk, and a permanent marker.
Base Kit - The base kit used when the Riga greenhouse is assembled directly onto the earth without the use of any concrete or pressure-treated wood foundation. It is made of reinforced aluminum for added durability and ensures that the frame is perfectly square. The lip of the base is actually meant to be placed in the ground, and the base kit is not needed when the greenhouse is already being anchored to a wood or concrete base. The shipping box is 240 inches long by 10 inches wide and deep and weighs 95 pounds.
Drop Down Door - An extra panel can be placed about the door of the Riga so that it drops down by 20 inches. This allows for the greenhouse to be built upon a stem wall (knee wall) foundation. A stem wall provides a solid base to build upon, raises the peak height by 20 inches, and is universally thought to add to the already beautiful aesthetics of the greenhouse.
Heavy Duty Seed Trays - These polypropylene black seeds trays are made in Germany and are perfect for starting seeds in your greenhouse. They are each 24 inches long x 16 inches wide x 3.5 inches deep.
Illumitex LED Grow Light - The Illumitex Eclipse GEN2 N Bar LED Grow Light Fixture F3 Spectrum comes either with a 9-foot long power cord or without one so that multiple fixtures can be daisy chained together. Each fixture is 4' long with 12 LEDS and is designed to be installed between 12 inches and 36 inches above the plant canopy. It features 0-10 volt dimming, is damp-rated and dust-resistant, and has a 5 year warranty. The fixture with the plug can be daisy chained and the fixture without a plug includes a 2-foot long cord for daisy chaining. The fixtures have an anodized aluminum frame and are made in Austin, TX.
Misting System - The misting system that comes standard with Royal Victorian greenhouses is available for Riga greenhouses. It offers a convenient way to keep your plants hydrated while lowering the inside temperature of your greenhouse on hot days. The standard system is 14' long and will work for a 20' section of greenhouse, though it can be cut down for use in smaller greenhouses. Made in Belgium, the kit includes 5 misters and ships in 2 pieces with a connector.
Moveable Plastic Hooks - The moveable plastic hooks come in sets of ten. These snap into the aluminum frame profile and are used for helping orient growing plants such as tomatoes or string beans.
Powered Ventilation System - A powered ventilation system is available from Exaco to give your greenhouse maximum ventilation on warm days. This system uses a 20 inch exhaust fan, a 24 inch motorized intake shutter, and a single speed thermostat [model VC115-C], all from J&D Manufacturing. The exhaust fan and motorized intake shutter are installed in opposite ends of the greenhouse to provide air flow from one end to the other.
All of the equipment runs on a 110/115V connection. The powered ventilation system can be purchased with just the exhaust fan and thermostat, where one or more of the roof windows can be used for fresh air intake. If the complete system with all components including the motorized intake shutter is purchased, a plug splitter will need to be purchased separately so that both the exhaust fan and shutter can be used with the same thermostat.
The exhaust fan requires a 20.25 inch x 20.25 inch opening and is usually positioned high on the back wall. It comes pre-wired with a 9 feet long plug-in power cord. The intake shutter requires a 24.25 inch x 24.25 inch opening and is usually positioned in the lowest panel in the front wall. It also comes pre-wired and with a 9 feet plug-in power cord. Friendly installation help is available from Exaco for any questions you may have.
Riga XL Complete Accessory Kit - Many of the accessories that you would need to complete your greenhouse growing experience have been assembled into one kit. It includes a heater, exhaust vent, thermostat, solar light, 14' top shelf, 14' bottom shelf, 5 seed trays, 10 stainless steel hooks, and 10 plastic hooks.
Dayton 'Big Red' Heater - This electric heater generates 13,000 BTU using a 220V connection and is sufficient to keep the Riga heated on cold days.
JD Manufacturing Exhaust Vent and Thermostat - This ventilation system uses a 20 inch exhaust fan with a thermostat to help keep your greenhouse properly ventilated on warm days. The exhaust vent runs on a 110V connection at 3400 CFM and the single speed thermostat runs on either 115V or 230V at 10 amps and 60 hertz.
Solar Light - The solar light includes an external 3 watt (80 mA) solar panel and Ni-MH battery pack (4.8 V, 2000 mA) with an internal light system to provide plenty of light for working in your greenhouse at night. The LED light dome has a diameter of 6 inches and is 7 inches high. It is mounted inside the greenhouse and a 9 feet long wire between the solar panel and the bulb is included. The light has a brightness of 6000 degrees Kelvin and the entire unit has a limited 2 year warranty. On an average sunny day, the light will produce 250 lumens for up to 4 hours. The solar light can be ordered separately from the Complete Accessory Kit.
Riga Top and Bottom Shelves - The accessory kit includes two hanging Riga IV shelves for one side of your greenhouse. This allows for more floor space and the shelves are strong enough to support the weight of an adult. The top shelf is 14 feet long and 14 inches deep and the bottom shelf is 14 feet long and 25 inches deep.
Heavy Duty Seed Trays - These polypropylene black seeds trays are made in Germany and are perfect for starting seeds in your greenhouse. Five are included with the complete accessory kit they are each 24 inches long x 16 inches wide x 3.5 inches deep.
Adjustable Stainless Steel Hooks - Ten of these hooks are included with the complete accessory kit. These are perfect for holding lights or flower baskets and other hanging plants.
Moveable Plastic Hooks - The complete accessory kit for the Riga XL includes 10 moveable plastic hooks. These are used for helping orient growing plants such as tomatoes or string beans.
Riga XL Pro Kit - The Riga XL Pro Kit Kit from Hoklartherm is distinct from the Complete Accessory Kit and offers everything you need to start growing. The kit includes Riga XL 9 top and bottom shelves. The top shelf is 29 feet long and 10 inches deep and uses polycarbonate inserts to allow for more light. The bottom shelf is 29 feet long and 25 inches deep and uses polycarbonate inserts or the optional heavy duty seed trays can be used. It also includes 3 sets of Illumitex LED grow lights that are 46 inches long each, a complete powered ventilation system (24 inch intake shutter vent, 20 inch exhaust fan, thermostat to control vent and fan), a 17500 BTU 220V electric heater, 5 heavy duty seed trays, 10 adjustable stainless steel hooks, 10 moveable plastic hooks, and the assembly facilitation kit.
Roof Windows - Though this Riga greenhouse already includes a sufficient number of windows, extra roof windows are available to provide even more ventilation. Each window is 40 inches x 24 inches and includes an automatic opener. This opener does not require electricity as it has a special paraffin oil cylinder which expands and contracts based on the temperature. The temperature range on the automatic opener is adjustable.
Roof Window Restraints - The roof window restraint system for each window includes two 15 inch stainless steel cables with nuts and bolts. They are recommended for customers who live in high wind areas to help prevent sudden gusts of wind from damaging your roof windows.
Roof Window Sash-Locks - This Riga greenhouse already includes enough sash-locks to keep the included roof windows and top halves of the Dutch doors completely shut during inclement weather. Extra sash-locks are available if extra roof windows are purchased or if customers want some extra just as backups.
Top and Bottom Shelves - Top and bottom shelves for each side of the Riga XL 9 greenhouse are available separately from the accessory kits. This allows for more floor space and the shelves are strong enough to support the weight of an adult. The top shelf is 29 feet long and 10 inches deep and uses polycarbonate inserts to allow for more light. The bottom shelf is 29 feet and 25 inches deep and uses polycarbonate inserts or the optional heavy duty seed trays can be used.
Stainless Steel Hooks - Ten of these adjustable hooks are available in one set. These are perfect for holding heavier items such as lights or flower baskets and other hanging plants.
Victorian Slat Shelving - The most affordable shelving for Victorian greenhouses is also available for Riga greenhouses. They come in 2-slat or 5-flat sizes and in green or black. The 2-slat shelving is 9" wide x 59" long and the 5-slat shelving is 21" wide x 59" long.
Wheelbarrow Access Plate - A heavy-duty aluminum access plate is available to serve as a ramp for wheelbarrows over the threshold of your greenhouse. The plate is 21" long on each side x 19.5" wide x 1.75" high in the middle where it is hinged.
Hoklartherm Product Details
Hoklartherm Time Lapse Assembly of Riga XL Greenhouse Side Walls
Hoklartherm Riga Greenhouse Corner Profile
Hoklartherm Riga Greenhouse Foundation Base Profile
Hoklartherm Riga Greenhouse Foundation Frame Corners
Hoklartherm Riga Greenhouse Lower Front Door Assembly
Hoklartherm Riga Greenhouse Upper Front Door Assembly
Hoklartherm Riga Greenhouse Rear Wall Window Assembly (1 of 2)
Hoklartherm Riga Greenhouse Rear Wall Window Assembly (2 of 2)
Hoklartherm Riga Greenhouse Roof Window Assembly (1 of 2)
Hoklartherm Riga Greenhouse Roof Window Assembly (2 of 2)
Hoklartherm GmbH Corporate Overview (German)
Since 1982, Hoklartherm GmbH has been designing, engineering, manufacturing, and distributing premium greenhouses and outdoor structures throughout the world. The company began as a maker of arched greenhouses and the unique Riga design has remained popular ever since. The company was founded by an engineering graduate named Werner Hollander who had built the first prototype in his family's garden a few years earlier.
From this first arched design has come a series of incremental changes to make the Rigas among the very strongest greenhouses available anywhere. The frames have been engineered for strength and to shed off snow and the commercial-grade polycarbonate panels add extra strength to the structure. Hoklartherm now makes beautiful and unique pavilions as well which have been widely installed throughout Europe in parks, commercial settings, and luxury private gardens.
At Hoklartherm's headquarters in Apen, Germany, a section referred to as "Greenhouse World" opened to the public in 2012 to showcase all of their unique designs in one place. At this site is the Hoklartherm state of the art factory that employs all the latest quality control techniques and aluminum processing equipment to ensure the very highest and most precise build quality. Hoklartherm is now Germany's largest manufacturer of premium residential and commercial greenhouses and its structures have been enjoyed by happy customers all over the world.
Exaco Trading Co. began in 1987 as importer and distributor of a home paint mixing accessory called the Exomixer. Since then the family owned company has expanded its line considerably to include many different home and garden products, including some of the very best greenhouses from Europe. The company is led by CEO Kimberly Tyson Cook, formerly an award winning business reporter for the Austin American-Statesman, and Andrew Cook, the VP of Sales and Marketing.
Andrew travels to Europe to check on the manufacturers in person several times a year and has become a leading national authority on all things greenhouse related. He has appeared in many gardening articles and television programs nationally. In fact Andrew is available for phone support for customers during the installation of any of the premier greenhouses that Exaco distributes from its large Austin, TX warehouse.
Assembly Tips For Hoklartherm Riga Greenhouses
While the process of assembling a greenhouse might seem daunting, these kits are designed to be assembled by people even with no prior building experience. Depending on your skill level, the size of the structure, and the number of options you order, putting together a kit can take two or three adults one full weekend.
Many customers opt to hire a local handyman or contractor to simplify this process, and the affordable price of the kits makes it easy to do this. They can be readily found online at sites like AngiesList or HomeAdvisor. A version of the assembly manual is available as a PDF near the bottom of this page to give you a better idea of the process.
Site Preparation - Customers often tell us that the trickiest part of the the process is making sure that they have a good foundation upon which to build the structure. This foundation should extend around the perimeter of your greenhouse. It is ideal to have the foundation be as level and square as possible.
Concrete pavers or pressure-treated wood with crushed stone is often used, though actually pouring concrete will give the most permanent installation. The greenhouse is designed to last for decades, and pressure-treated wood typically will fail well before that when used in outdoor applications, particularly in the ground.
Exaco recommends that all the grass and weeds be removed from inside the greenhouse before assembly and that the area be covered with a weed control mat. Installing the greenhouse on a concrete slab may seem like an easier way to get started, but it's actually less than ideal, as the greenhouse floor should be free draining.
Standing water on concrete can freeze easily in winter months, causing a slip hazard. And concrete slabs don't help regulate the temperature inside the greenhouse as well as other floors such as pea gravel, pine straw, riverbed stones, or just regular earth. Customers typically will create some sort of path down the middle of their greenhouse with flag stones, bricks, or even decking.