The Hoklartherm Riga polycarbonate greenhouse offers a versatile, mid-sized solution for gardeners who want more growing space without sacrificing year-round performance. Designed and engineered in Germany, it combines durability, insulation, and flexibility in a larger footprint built to endure.
The Hoklartherm Riga greenhouse provides ample room for plants and projects while maintaining the strength and efficiency that define its reputation for excellence. Crafted with a reinforced aluminum frame and high-quality 8- and 10 mm-thick twin-wall polycarbonate glazing, it offers superior insulation and protection from snow, hail, and wind. Stainless steel hardware resists corrosion, and the curved side walls naturally shed snow, ensuring stability and reliability through every season. The polycarbonate has been manufactured to contain UV protection.
Adaptable and dependable, the Hoklartherm Riga greenhouse is available in multiple sizes to suit larger spaces. It delivers the confidence, comfort, and performance that gardeners expect from German engineering, creating an ideal environment for year-round growing.
"Perfect greenhouse. I love this thing! Gets use all year and is excellent quality and value."
- 15342
"Riga 4 thrives in harsh New England weather. I've had this Riga 4 greenhouse for 5 years. On Cape Cod, we have very beautiful summers and falls but winters can be brutal. We are a little sand spit sticking out into the North Atlantic. For example, this past winter we had over 100" of snow and hurricane force winds for many days at a time. The Riga greenhouse never has failed in 5 winters like this. It is absolutely built to withstand hurricanes. We use the greenhouse for seedling starts in the spring (starting around March 1) and then season extension in the fall from about October through January. We grow lettuce, spinach and micro greens in the fall and early winter. To regulate the warmth, we fill 3 large black plastic livestock watering troughs with water. They fit under the shelves on the north side of the greenhouse. The sun heats them up during the day and they give off their heat at night. This past winter they never froze inspire of many days of sub zero weather and cloud filled days. I am very happy with my Riga 4."
- Jeff
"Just starting with our Riga Greenhouse..What a joy. Our Greenhouse is on its way...Just spoke with Kim who was a wealth of information and interested in what we will be doing with our greenhouse here in Falmouth, MA.
As part of a community non-profit, Falmouth Together We Can Inc., we started a group called Well-Grounded; it is a Service Learning group that is made up of three teachers, English, science and woodshop; one community partner, an artist, about 15 students ranging in age fro 12 to 18 and the numerous business partners we have made over the past year. We provide spring and fall clean-ups to the Senior Center in town, churches in the community, plant the annual flowers for Veterans Day, shovel snow for our seniors, design and maintain our school Memorial Garden, and study, grow and sell organic, GMO free seedlings...thus the greenhouse. Our community has been incredibley supportive. We have one native partner who donated the funds for this greenhouse and another anonymous donor who gave 10k dollars to support our students. So proud of the students, and the fun I have is beyond words! Thank you Kim for making this adventure even more incredible! Stay tuned for pictures of set-up and completion.
- Kathleen
"A joy to work in! I am the horticulturist and garden manager for a large private estate located in Southern California. I grow organic vegetables for the estate and a nearby restaurant. Prior to acquiring the Riga III, I purchased my organic vegetable starts from a local grower. I was limited to the varieties that they chose to grow and had to deal with a lower level of quality than I wanted. After doing a LOT of online research, I decided that the Riga was the greenhouse that I wanted. I felt that the price was more than reasonable for all of the features offered. The ordering process and subsequent delivery was problem free. While the installation was somewhat challenging - with the aid of the video and the written instructions it was assembled by a team of three capable men in just over a day. Our greenhouse sits on a poured concrete pad that we installed with a drain and an irrigation quick coupler. This makes it easy to water and to keep the greenhouse clean inside. The Riga III is very roomy and I am able to have 32 flats of seedlings growing at the same time. The quality of my vegetable starts is amazing now! Seeds germinate in just a couple of days. The diffused light allows is perfect. I directly attribute the improved quality of the vegetables I am producing to the Riga III. I don't have to deal with snow here in Southern California- but as my greenhouse is sited on top of a hill in full sun- I do deal with high summer temperatures and occasional high winds up to 60 mph. The Riga is the only greenhouse I found that has a back wall window. The cross ventilation that I get by keeping the top of the dutch door open and the back window open really helps with keeping my summer temps low which helps to keep both my vegetables and ME comfortable as I like to work in the greenhouse in the afternoons. The Riga has withstood the winds like a champ! Of course, I didn't have to use my own money to pay for the greenhouse. My employer did that. But, I am so in love with this greenhouse that I am getting ready to buy one myself for my own backyard! I highly recommend this greenhouse to anyone who wants a beautiful, functional, strong, easy maintenance, high quality greenhouse in which to grow beautiful plants of any type!"
- Lydia
"Loved my first Riga so much I bought another! I bought my first Riga III Greenhouse in January of 2014. This is a sturdy little greenhouse! Lots of great features for the price. I did lots of "shopping around" before I purchased a greenhouse and just kept coming back to the Riga. By the end of my first "growing season" I sadly realized I had not bought a big enough one. I was determined to have something larger for 2015 so I started shopping around again. I just kept coming back to wanting another Riga. I was sold on its features and how sturdy it was.
I knew it would survive our extreme Nebraska weather - wind, hail, rain, wind, snow, ice, heat, wind, cold....and did I say wind? Yep, my Riga endured and stood up to all that weather its first year. So.....in February of 2015 I purchased another Riga III greenhouse. I bought one identical to my first one and butted the two together to make one greenhouse! I now have all the room I need! And my plan to put the two together worked out perfectly! We mounted the door on the second greenhouse so it swings IN instead of out. I can close off the second greenhouse if I don't have plants in it or don't want to heat it.
I now have two automatic roof vents, a window on one end and the divided door on the other end - just like it was when they were single greenhouses. The greenhouses butted together with only about a half inch space between them. We cut silver flashing and screwed it on to the outside of the greenhouses thus "connecting" them and sealing out any air. We also added clear calk to help seal and adhere the flashing to the greenhouses. There is absolutely NO air that seeps into the greenhouses through this small space. My greenhouses are mounted on 4X4 treated timbers. I have dirt floors which I have covered in ground soybean mulch which helps keep heat in and also absorbs water. They are firmly mounted to the ground with those tie downs that screw in to the ground.
This greenhouse is secure! Might not withstand a Nebraska tornado, but it has stood strong through some 40-50 MPH winds. I am SO happy with my Riga greenhouse! I would recommend a Riga to anyone who is looking to buy a greenhouse. They are sturdy. I have no problem with keeping my Riga heated in the winter and cool in the spring/summer. And, like I said before, we have some pretty extreme weather here in Nebraska. You will not believe how quickly stuff germinates in this greenhouse. The conditions are perfect. My only advice would be to MAKE SURE you buy a big enough one the FIRST TIME! And....when it comes to assembly...the video that comes with the greenhouse is your best friend. Watch it at least once before you even attempt assembly. We took a laptop to our assembly site and watched the video step by step as we put it together. This being said it really wasn't that hard to put together and ours went up fairly fast. I just can't say enough how much I love my Riga greenhouse!"
- Redmanhunter
"Structural Integrity. We purchased a Riga 8 and are pleased with the quality and strength of the product. Assembly was well documented. Customer service was exceptional. Exaco is a first class operation. The Riga system is perfect for our windy location."
- Merric
"Riga is a real winner at 3500 feet in Canada. We bought a Riga 4 in the late fall of 2014. By the time it arrived the ground was frozen and snow covered so my husband and some neighbors assembled it in our garage. When the snow left early this year we got a bunch of friends to help move it to a pad in the garden and by March 4th I had planted lots of cold loving plants directly in the ground.
Between the ground-planted crops and indoor-started plants being hardened off, the greenhouse has been continuously busy and productive ever since. COMPLETELY WITHOUT SUPPLEMENTAL HEAT, by mid-April we began harvesting loads of spinach, lettuce, green onions, radishes and bok choy until we began replacing these early veggies with heat lovers like tomatoes, peppers and muskmelon.There were a few nights early on where we had a borderline frost but no damage on the cool climate plants and now (June 7th) the trick will be to prevent overheating.
I have had home made greenhouses before but NOTHING has matched the Riga performance. I am already harvesting peppers. This is all happening on a north-east facing slope at 3500 feet elevation in the Canadian Rockies. Amazing!"
- Bonnie
"Great greenhouse for amateur enthusiast. I bought this close to 3 years ago and love it. It was fun to put together and I have since added electricity so I can run fans, heat (only a little on coldest nights), and grow light. I use it to winter over plants as well as grow seedlings. I'm in it almost every day."
- Joe F.
"Very pleased with our Riga V. Our Riga V is mounted on a stem wall. We grow vegetables year round in Northern New Mexico at 7800 ft. Retrofitted the doors for summer with screens to maintain temperatures. So great to have fresh tomatoes in the winter!"
- Dr. D
"We assembled my Riga IV greenhouse this fall so that I can start my vegetables much earlier in the spring. The result is not only practical but beautiful. I bought this style because I live at a high elevation where we get a lot of snow in the long winter. The ceiling windows opened and closed automatically from the start. Exaco provided outstanding support, from my many phone calls to the great coordination of the delivery truck. Their DVD provided very helpful insights into the assembly. I also appreciate many of the details provided by the German engineering of the design. I'm thrilled with my final greenhouse and would recommend it to any of my friends."
- MaryN888
"Sturdy, well-made, everything I expected and more. I been enjoying my greenhouse for five years now. Right about now (November) the seed catalogs arrive, a favorite time of the year. Come January-February I'll begin my seed germinating in the greenhouse. A small oil-filled electric heater keeps the temps above freezing. Sometimes I overwinter hot pepper plants inside, too."
- Bill K.
"The best retirement present ever! I live in Downeast Maine and bought my Riga greenhouse 10 years ago. It provides vegetables and herbs from March through November. When some panels showed deterioration last year, I called Exaco and found that they were originally installed with the UV coating on the wrong side. Exaco sent me replacement panels just for the cost of shipping and said that the Riga now comes with UV coating on both sides. I think that is customer service "above and beyond!"
- Lynn
"Beautiful to look at easy to use. We have been using it for 10 months and love it. I chose the Riga because it seemed to hold up well in the snow for other users and I have not been disappointed. The shape of the greenhouse allows rain and snow to fall off easily and it still looks beautiful in the garden. I did underestimate the need for shade in the summer and we have none where we set it up so I will share what worked well for us.
You will see lots of pics from people using shade cloth on the outside, wouldn't that be nice! We live in a high wind area and that was not an option for us. I ended up getting aluminet (80% for the south side and 50% for the north side) shade cloth and hung it inside using the extra bolts that came with the greenhouse, don't throw those away. We just hung the cloth up and used washers with the bolts to hold it snug to the aluminum supports and cut flaps for the top window vents. Sometimes I would spray it down with water and that really dropped the temp. For the future though I planted some trees around it, the cloth is a bit of a hassle. I was surprised how easy it was to install the ventilation fan and louvers, I thought the sheets would be hard to cut but they really were not, we just used a jigsaw with a fine blade. I think it took us 2 days to set up the greenhouse itself with 3 people and we did the ventilation on another day. You really do need 3 people.
Some of it is not intuitive but the video provided by Exaco was really great and they were there to help us with any other questions. For the floor I have 3 zones, pavers in the middle for walking, rock on weed barrier on the right for potted plants, and a compost mix 3 ft wide along the south wall for planting in ground. We actually built the greenhouse in Feb thanks to a mild winter and I was able to use it for starting seedlings. I also planted carrots and lettuce in ground and had a nice crop early."
- Kristin
"A nice and functional sturdygreenhouse. It is now a year + later and I am still very pleased with this structure. It is very functional much more energy efficient than my previous one and has even survived a hurricane. Definately not a single man job and probably would have been much easier with three persons but two ole guys were quite successful."
- Wayne
"We purchased our greenhouse nine years ago and have been extremely happy with it ever since. The instructional DVD was invaluable in the construction of the greenhouse."
- PMac1951
"My husband and I really love this greenhouse. We were looking for something that would fit in our small backyard yet give us enough space to grow seed starters. This greenhouse is very well made and we use just a small milk house heater thru the winter and it stays quite warm in there.
We have had this for about 4 years and it has exceeded our expectations. We have quite hot summers where we live and the only parts that need replaced since we bought it is the extended arm for the gable end window to hold the window open and a couple of the flat panels that the seed trays sit on. We also love the automatic vent openers on the 2 windows, it saves a lot of running back and forth to open and close according to the weather, and the large black seed trays that came with it hold a lot of plants/seeds in a small area. Overall we are very happy with our purchase."
- Dave
"Rocky Mountain garden. After wrestling with the city for permits, I finally was able to build my greenhouse in about 3 days. The directions were a bit lacking, but I work construction and was able to figure it out. It seems to have survived well thru its first snow storm.I have some leftover parts and not sure what they go to.
- Rosscoe P.
"This is a major piece of fine equipment. I spent a lot of time reading and researching various greenhouses and this one seemed to have a number of details well thought out. It is so well made that if you pay attention to the directions it goes together perfectly. We have installed it on a concrete driveway and it stayed pretty warm through a cold Utah winter with 2 minor little heaters. We live in an extremely windy place and the special safety wires for the vents have held up well. We even installed an extra one for the open door. The space is great and we even built a feral cat shelter into the back left corner!"
- Diane
"Great product and best support I've ever seen. I looked for a large greenhouse for a year. My wife and I choose the Riga XL because of the size and style. Best of all, we are super happy with the quality of the greenhouse and the support we got from Andrew and his team. I'm 63 and my wife is a little younger. We were able to put it together by ourselves with the great advice we got from Andrew. It took time, and at times was a little frustrating, but it was well worth it. When we ran into problems, Andrew solved the problems quickly and without question about whose fault it was. If I were to buy another greenhouse, The Riga and Andrew would be my first and only choice."
- Landroverbill
"We live on the eastern side of the Sierras where the wind "blows the sun away." The winds come over the mountain and can be quite ferocious, on a regular basis, every year, and we have seen heavy, heavy snow. Our Riga has survived 100-mile-an-hour winds here and has gone through numerous windstorms without a problem until we had a 120-some mile an hour storm in January. Then the wind caught the door and broke the hinges. Now that I have the metal hinges for the door it should be fine. It has also nicely survived heavy snows here; the snow slides off the roof. When we were looking online to find a greenhouse that would survive our climate, we ran across your website showing your husband standing straddling the peak, and we knew we had found what we were looking for. I can't remember what year we bought it, somewhere around 2007, and it has gone through everything nature could throw at it so far. I have put up garden-style lattice-work on steel poles on the windward side to help shield it somewhat from the wind, which has helped somewhat too. Your product is truly a step above the rest.Other greenhouses in this area have not fared as well. I have even tried to steer people who were in the market to buy greenhouses to the Riga. Again, thank you for your excellent product."
- Rick
"Great for Michigan weather! So far we're using our greenhouse as a chicken coop. Chickens love it, natural light but plenty of space to dig and scratch. Funner than a small dark coop b/c we can walk inside the chicken coop and enjoy being with the chickens without being crowded.
We use an electric dog water bowl and the chicken feeder hangs from the ceiling frame. A 2x4 spans the rear of the coop for roosting. In the spring all doors and vents need to be open else it gets too hot. We had custom cut aluminum panels to change the front door from solid panels to something more like a fence (chickens need fresh cool air). Also, we hung chicken wire over the back window so that can be open in the summer. Through the winter we just let the deep bedding straw and compost mixture build up and mix it with our boots every so often..... easy, no coop to clean. When we sold our house, 3 adults lifted the greenhouse, put it on a trailer and towed it to our new location (~25mph). Great product, great for chickens in the winter! Assembly took 1.5 days by myself, would be a lot faster with 2 people. Soon we hope to use it as a real greenhouse."
- Luke83
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