Riga XL Greenhouse

Do you want the biggest, strongest, best-insulated greenhouse in the Riga range? Then the Riga XL Greenhouse is for you. It’s the flagship “onion” model, built by Hoklartherm for dedicated, year-round gardeners. Above all, it offers more space, more height and more insulation than any other Riga. So if you’re serious about growing in every season, the XL delivers.

The XL owes its performance to two things. First, it uses thick 16mm triple-wall polycarbonate glazing. That’s twice as thick as the panels on the standard Riga and Riga Deluxe. Second, the curved “onion” walls shed rain and hail and let high winds slip over the structure. As a result, it’s both incredibly well insulated and incredibly strong.

Why Choose the Riga XL Greenhouse

The XL is built for capacity and performance. To start, it’s taller and wider than other Riga models. So you get generous room for plants, benches and bigger projects. In addition, the 16mm triple-wall glazing — usually seen only on custom greenhouses — traps heat brilliantly. As a result, you can grow year-round and hold steady temperatures with minimal heating.

The build quality matches the scale. For example, a reinforced 13-gauge aluminium frame braces the whole structure. Stainless steel hardware then resists corrosion for the long haul. Plus, heavy-duty rubber seals keep out drafts and moisture. The polycarbonate also diffuses light evenly and blocks UV. So your plants enjoy soft, scorch-free light, even in a structure this size.

Key Features

• The largest, best-insulated model in the German-engineered Riga range
• Thick 16mm triple-wall polycarbonate glazing — twice as thick as standard Riga panels
• Outstanding insulation for true year-round growing
• Curved “onion” walls that shed rain, hail and snow
• Aerodynamic shape that stands firm in high winds
• Reinforced 13-gauge aluminium frame
• Corrosion-resistant stainless steel hardware
• Heavy-duty rubber seals against drafts and moisture
• Diffused, UV-protected light to prevent plant scorching
• Taller and wider interior than other Riga models
• Available in multiple lengths up to around 413 sq ft
• 15-year frame warranty (10-year glazing)

H2: Sizes and Specifications

The Riga XL comes in several lengths, so you can scale it to your needs. As a guide, here are the key specs:

• Style: freestanding, curved-wall (“onion” profile)
• Width: approx. 4.3m (14’2″)
• Glazing: 16mm triple-wall polycarbonate (walls and ends)
• Frame: reinforced 13-gauge aluminium extrusions
• Hardware: stainless steel
• Ventilation: automatic roof vents (multiple, by size)
• Floor area: options from around 231 up to 413 sq ft
• Warranty: 15-year frame, 10-year glazing

So browse our full greenhouse range and greenhouse accessories. Or speak with our team for sizing and configuration advice.

H2: Riga XL vs Riga Garden vs Deluxe — Which Should You Choose?

All three share the same curved, German-engineered design, so the difference is size and glazing. The standard Riga Garden uses 8mm/10mm twin-wall glazing in a mid-sized footprint. The Riga Deluxe is wider and includes a base foundation. The Riga XL, by contrast, is the largest and best-insulated, with thick 16mm triple-wall glazing. So choose the XL if you want maximum space and insulation for serious, year-round growing. For other options, compare our full polycarbonate greenhouse range too.

H2: Foundation, Siting and Setup

A greenhouse this large needs careful planning and a solid foundation. So prepare a level, well-drained base first, such as a concrete slab. Next, choose a sunny, open spot with room for the full footprint. Then orient the longer side toward the sun for even light. Because it’s a substantial structure, check with your local council about building permits before you order. We also recommend professional assembly for a greenhouse this size. For siting help, the Australian Government’s Your Home guide is excellent. The Bureau of Meteorology also helps you plan around local sun, wind and frost.

H2: What to Grow

A large, well-insulated greenhouse opens up true year-round growing at scale. For example, you can grow vegetables, tomatoes, cucumbers, herbs and cut flowers in every season. Plus, you can overwinter tender plants like citrus and orchids with minimal heating. For season-by-season advice in Australian conditions, Gardening Australia is a trusted resource.

H2: Frequently Asked Questions

What makes the XL different from other Riga models? It’s the largest and best-insulated. Above all, it uses thick 16mm triple-wall glazing — twice as thick as the standard Riga and Deluxe.

How big is it? It’s the widest Riga at around 4.3m, with floor areas from roughly 231 up to 413 sq ft, depending on length.

Why are the walls curved? The curved “onion” shape sheds rain and hail, and lets high winds slip over the structure. So it’s exceptionally strong.

Is it hard to assemble? Because of its size, professional assembly is recommended. The channel-fit design does help, but it’s a big structure.

What warranty does it come with? A 15-year frame warranty and a 10-year glazing warranty.

H2: Conclusion

In the end, the Riga XL Greenhouse is the ultimate year-round growing structure. It combines the largest footprint in the Riga range, thick 16mm triple-wall glazing and a reinforced, weather-shedding design. Plus, with German engineering and a 15-year warranty, it’s built to last for generations. So browse the range or get in touch for expert advice today.