Greenhouses

Riga Polycarbonate Greenhouse

$6,899.00 USD

Before ordering your greenhouse, give us a call at 737-298-0766 so we can help you find the perfect fit for your garden. The Riga polycarbonate greenhouse is a...

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In your garden.

A distinctive curved greenhouse for growing through the seasons. Explore the real garden setting, then compare model dimensions and included features before choosing your Riga.

Get to know your growing space.

A distinctive shape

The Riga is recognizable by its curved, onion-shaped profile. The catalog describes this shape as helping snow slide away from the roof.

Growing through the seasons

Polycarbonate glazing and an aluminum frame form the growing space. Check the specifications for the glazing and ventilation included with each model.

A place in your garden

riga polycarbonate greenhouse on stemwall

Use the model dimensions to plan your growing space, access and site preparation. Ask us about installation and delivery before ordering.

Size, details
& care.

Check the specifications against your space, then explore the product details before choosing.

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About this piece

Before ordering your greenhouse, give us a call at 737-298-0766 so we can help you find the perfect fit for your garden.

The Riga polycarbonate greenhouse is a gardener’s favorite, instantly recognizable by its iconic onion-shaped silhouette.

More than a beautiful design, its curved profile is engineered to withstand high winds while helping snow slide off rather than build up overhead. German-made and designed for year-round growing, the Riga polycarbonate greenhouse gives your most-loved plants a beautiful place to thrive, season after season.

Features & care

Designed and manufactured in Germany by Hoklartherm, the Riga pairs its unmistakable curved profile with the strength and growing performance serious gardeners expect. A substantial aluminum frame and insulating twin-wall polycarbonate glazing create a protected environment built for growing through the seasons.

Inside, the Riga is every bit a gardener’s greenhouse. Start trays of seedlings while the outdoor garden is still waking up. Give tomatoes, peppers, and other heat-loving crops the conditions they crave. Extend the harvest into fall, protect treasured plants through winter, or simply enjoy having a place where there is always something growing.

Automatic roof ventilation helps manage rising temperatures, while additional ventilation and the split barn-style door make it easier to keep fresh air moving through the greenhouse. The twin-wall polycarbonate glazing diffuses sunlight throughout the growing space while providing valuable insulation from changing outdoor temperatures.

Available in three sizes, the Riga can be everything from a hardworking backyard growing house to the centerpiece of an abundant kitchen garden.

Distinctive, remarkably strong, and designed around the way gardeners actually grow, the Riga earns its place in the garden season after season.

About the maker

Hoklartherm has been designing and manufacturing premium greenhouses in Germany for more than 40 years. Known for thoughtful engineering, durable construction, and distinctive European design, the company creates greenhouses built to handle demanding weather while providing exceptional growing environments. The Riga’s iconic curved profile is one of Hoklartherm’s most recognizable designs, combining strength, function, and unmistakable character.

Your questions, answered

What makes the Riga greenhouse different from a traditional greenhouse?
The Riga is known for its iconic onion-shaped profile. The curved design is more than distinctive—it helps the greenhouse withstand high winds while encouraging snow to slide off the roof rather than accumulate overhead.

What is the Riga greenhouse made of?
The Riga features a substantial aluminum frame with twin-wall polycarbonate glazing. The curved side walls use 8 mm twin-wall polycarbonate, while the gable ends use 10 mm twin-wall polycarbonate for added insulation and durability.

Is the Riga greenhouse suitable for year-round growing?
Yes. The Riga is designed for year-round use and provides an insulated, protected environment for starting seedlings, extending the growing season, growing warm-season crops, and protecting tender plants. Heating may be necessary during colder weather depending on your climate and what you plan to grow.

Does the Riga greenhouse have automatic ventilation?
Yes. Each Riga includes automatic roof vent openers that respond to temperature changes without electricity. The Riga 3 has one automatic roof vent, the Riga 4 has two, and the Riga 5 has four. A rear window and split barn-style door provide additional ventilation.

What sizes are available?
The Riga is available in three sizes. The Riga 3 measures 9'8" × 10'6", the Rig

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Compare the specifications for each model.

Riga 3

Riga 3 specifications
Dimensions	9'8" W × 10'6" L
Peak Height	7'7"
Growing Area	102 sq. ft.
Glazing	8 mm twin-wall polycarbonate side walls; 10 mm twin-wall polycarbonate gable ends
Frame	13-gauge aluminum
Door	1 locking barn-style hinged door
Door Size	30" W × 79" H
Roof Vents	1
Automatic Roof Vent Openers	1
Rear Windows	1
Window Size	3'5" × 2'1"

Riga 4

Riga 4 specifications
Dimensions	9'8" W × 14' L
Peak Height	7'7"
Growing Area	135 sq. ft.
Glazing	8 mm twin-wall polycarbonate side walls; 10 mm twin-wall polycarbonate gable ends
Frame	13-gauge aluminum
Door	1 locking barn-style hinged door
Door Size	28¾" W × 77¾" H
Roof Vents	2
Automatic Roof Vent Openers	2
Rear Windows	1
Window Size	3'5" × 2'1"

Riga 5

Riga 5 specifications
Dimensions	9'8" W × 17'6" L
Peak Height	7'7"
Growing Area	165 sq. ft.
Glazing	8 mm twin-wall polycarbonate side walls; 10 mm twin-wall polycarbonate gable ends
Frame	13-gauge aluminum
Door	1 locking barn-style hinged door
Door Size	28¾" W × 77¾" H
Roof Vents	4
Automatic Roof Vent Openers	4
Rear Windows	1
Window Size	3'5" × 2'1"