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Janssens Royal Victorian VI 46

Royal Victorian


Hoklartherm RIGA XL6



"In general, an unheated greenhouse lets you grow plants rated for about one USDA climate zone warmer than our local area. This translates to about five to eight degrees Fahrenheit. Another way to think of it is that you'll add two to three weeks on each end of the growing season. But if you provide supplemental heat and light in the greenhouse, you can grow any kind of plant you like." - Roger Marshall, The Greenhouse Gardener's Manual

Imagine starting your summer seedlings in a dedicated greenhouse instead of on your kitchen table, garage, or basement! Grow ripe tomatoes in the winter, or curate your own collection of tropical plants! 
Create an outdoor sunroom, or even enclose your hot tub!

So many possibilities!

  • Taller and made with thicker wall panels than others, the Riga and Royal Victorian Greenhouses are available in multiple sizes.


  • The Royal Victorian comes in green or black aluminum and with glass or polycarbonate (recommended) panels.


  • Hobby gardeners up their growing game with Riga greenhouses; the XL models feature triple wall polycarbonate panels that protect plants from the cold.  Optional accessories allow owners to customize the interior layout to meet personal preferences.

New Growth




Approx. Last Spring Frost: May 10
Approx. First Fall Frost: Sept 28
Number of Growing Days: 140

As a general rule, most annual vegetables should be started indoors about six weeks before the last frost in our area--last week in March.


#1 Every sunny surface inside your home is occupied with plants! 

Enjoy Year-Round Gardening with a RIGA XL Greenhouse 

#2 You want to get a jump-start on the season and enjoy produce into late Fall!

Extend your season with a standard RIGA Greenhouse or Royal Victorian Greenhouse with polycarbonate panels 


#3 You crave a space to soak up the sun while surrounded by your favorite summer flowers!

Create a private solarium with a glass panel Royal Victorian Greenhouse