Garden Mart 21 ft. Wide Retail Greenhouse
Garden Mart 21 ft. Wide Retail Greenhouse
Garden Mart 21 ft. Wide Retail Greenhouse
Garden Mart 21 ft. Wide Retail Greenhouse
Garden Mart 21 ft. Wide Retail Greenhouse
Garden Mart 21 ft. Wide Retail Greenhouse

Garden Mart 21 ft. Wide Retail Greenhouse


$11,585.00 Regular price
  • Ships directly from manufacturer - departs in about 3 weeks

The Garden Mart is designed to be a modular, low-cost and movable sales building for added spring plants sales. This popular retail model has been engineered for superior strength, easy future expansion and dramatically simplified setup. It offers protection for your plants and shopping comfort for your customers. The Garden Mart includes built-in benches, handy roll-up side ventilation, four runs of hanging basket purlins, double-sliding end doors, and easy snap-together assembly.

  • 2" o.d. 14 gauge galvanized steel frame.
  • Clear or white 6 mil. poly on roof and endwalls with roll-up poly sidewalls.
  • Integrated display bench system.
  • Four hanging basket purlins run the length of the Garden Mart. Two are above the center benching and another two are above the outside benching.
  • Roll-up side ventilation. (Slide-Side ventilation available - call for details)
  • Choose from water tubes, ground stakes or leg stands to keep your Garden Mart secure and protected from high winds.
  • A wide six-foot opening allows easy access to the Garden Mart. Covered in durable, twin-wall polycarbonate.
  • Components supplied for easy snap together assembly.
  • Installation instructions included.


Width = 21'
Length = 24' - 96' (in 6' sections)
Sidewall Height = 6'
Height = 11' 4"
Frame Spacing = 6'
Door = 6'W x 6'8"H
Click here to view dimensional information


Though the Garden Mart is NOT a load-rated structure, it has an extremely sturdy galvanized steel frame with a unique hold-down system of water tubes, ground stakes, or leg stands. It's strength is the easy Snap-Button assembly which makes it quick to erect and simple to move or even disassemble. The built-in shelves make an all-in-one, complete package.


Size Benching Area Flat Capacity
(1020 style)
Basket Capacity
(10-inch baskets)
21' x 24' 360 sq. ft. 216 96
21' x 30' 486 sq. ft. 294 120
21' x 36' 612 sq. ft. 372 144
21' x 42' 738 sq. ft. 450 168
21' x 48' 864 sq. ft. 528 192
21' x 54' 990 sq. ft. 606 216
21' x 60' 1,116 sq. ft. 684 240
21' x 66' 1,242 sq. ft. 762 264
21' x 72' 1,368 sq. ft. 840 288
21' x 78' 1,494 sq. ft. 918 312
21' x 84' 1,620 sq. ft. 996 336
21' x 90' 1,746 sq. ft. 1,074 360
21' x 96' 2,016 sq. ft. 1,152 384

Optional Accessories

To view or purchase additional accessories including evaporative coolers, benches, grow lights, shade cloth & irrigation systems, browse the Greenhouse Megastore or contact a Greenhouse Megastore Sales Representative Toll-Free at 1-888-281-9337.


This item ships via Motor Freight Carrier - almost anywhere in the Contiguous United States

Motor Freight Requirements

  • The shipment must be delivered to a business or residence (a PO Box is invalid)
  • The delivery address must be able to accommodate a tractor/trailer as much as 70' in length
  • Someone must be present to receive and unload the shipment from the truck
  • Shipments and/or locations requiring a lift gate, inside delivery, and/or with limited access may incur additional charges by the carrier

Please contact Greenhouse Megastore Customer Service at 1-888-281-9337 if you have any questions about delivery to your specific address so we can ensure the smoothest delivery possible!

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Customer Reviews

Based on 2 reviews
Legacy Review

This is an awesome greenhouse.Very impressive appearance inside and out.I put this together by myself start to finish,although I don't recommend it for the normal person,my wife says I'm not normal.It is very easy to put up and the directions are easy to understand and any tech support you may need is a phone call away.The people at Poly -Tex are very pleasant and knowledgable.This is a great greenhouse.

Legacy Review
A Very "Pleasant" surprise

I recently purchased a RG-GM 21' x 30' greenhouse for my private use. The greenhouse came exactly as advertised. The assembly was surprisingly easy (particularly when viewing the completed unit....impressive !) The instructions were easy to following though I recommend laying out the parts in an organized manner. I would also advise any purchaser to be prepared to handle the shipping containers prior to their arrival if you are not a commercial operation (weight and size). I myself, hired someone locally (equipment rental establishment) to unload the relatively large and heavy pallets. We, my wife, her uncle, and myself (I am 59 years old), unloaded the pallets, organized and assembled the 11' tall greenhouse in two weekends....without killing ourselves. As noted, the assembly instructions were easy to understand with part's drawings and assembly drawings provided. I, again, would like to state that this unit was a pleasant surprise, both in ease of assembly and how good it looks when completed. My only suggestion would be that you design and fabricate a ratcheting socket wrench to complete tightening of the wing nuts (I took a 1 tall 3/8 socket and slotted it to fit around the wing nut tabs). Dean