Growers Supply


GrowSpan Round Premium Greenhouse Systems

These greenhouses are suitable for the backyard hobbyist or the professional grower. The twin-wall polycarbonate covering provides strength, durability and elegance. Clear sheets are flame retardant, will not discolor and have up to 78% light transmission.

  • Frame is manufactured from highest quality USA-made, triple-galvanized structural steel tubing.
  • End frame is constructed from strong 16-gauge, 1.5" square USA-made, triple-galvanized structural steel tubing.
  • Ends and top covering are constructed from our 8 mm twin-wall polycarbonate sheets that are light in weight, virtually unbreakable and come with a 10 year warranty.
  • Panels contain UV inhibitors which prevent degradation.
  • Built-in condensate control eliminates water droplet formation for a healthier plant environment.
  • Units come equipped with a 36"W x 80"H heavy-duty aluminum entry door, complete with 6 mm polycarbonate sections at both top and bottom, stainless steel hinges and latch.
  • Optional single door kit for the back, sold separately.
  • Heavy-duty ground posts are included. Baseboards are recommended. Our Recycled Plastic Lumber is ideal and comes with a 50 year warranty.
  • Save hundreds of dollars on equipment and accessories when you purchase the Greenhouse System. We've done all the calculations for you. The size and quantity of items are determined by the size of your greenhouse.