Greenhouse and greenhouse supplies

Global Greenhouse Systems

Most Trusted Name in Greenhouses • Serving the Horticulture Industry since 1946!
PO Box 1564 Mobile, AL 36633 USA.
1-800-531-4769 (toll free)  • 251-471-5238 (local) •  251-471-5465 (fax)



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greenhouse and greenhouse supplies

Greenhouse Systems

Retractable Roof
Greenhouse Structures
Greenhouse Ranges
High Technology
Low Technology
High Tunnels
Cold Frames
Shade Structures

Greenhouse Supplies

Aluminum Wire Lock
Bench Systems
Black-Out Cloth/Systems
Biological Controls
Bumble Bee Pollinators
Capillary Watering
Carbon Dioxide Generators
Climate Controllers
Coconut Coir Fiber
Computer Control Systems
Cooling Systems/Components
Drip Irrigation Systems
EC Meters
Energy Conservation
Evaporative Cooling Systems
Exhaust Fans
Fabrics, Agricultural/Geotextiles
Greenhouse Ventilation
Fertilizer Injectors
Fiberglass Panels
Film Fastener/Lock Systems
Fog Systems
Gear Motors
Glazing Systems
Ground Covers
Ground Fabric
Heat Retention Systems
Heating Systems
Hydroponic Equipment/Supplies
Insect Screen
Irrigation Systems
Irrigation Controls
Irrigation Equipment
Light Meters
Lighting Systems
Lighting Fixtures
Lighting Bulbs
Misting Equipment
Moisture Meters
Mulches, Plastic
Nursery Equipment
PH Meters
Plastic Films/Sheeting
Polycarbonate Sheets
Poly Film Hoop
Polyethylene Films
Rack and Pinions
Row Covers
Shade Structures
Shade Cloth
Shade Systems
Side Curtains
Soil Mixers
Soil Sterilizers
Temperature Control Systems
Thermal Screen
Track Systems
Vine Supports
Water Testing Equipment
Weed Barriersv
Wire Lock


Wm. T. Sierke  -  Co-FounderIn 1946, our grandfather and father started "Trans-Sphere Trading Corporation" a traditional Import/Export Company. During the '50's, largely due to the many ornamental nurseries in our area, we began specializing in horticultural products. We initially began importing peat moss by the shipload from the bogs in Germany for the ornamental growers in the Southeast for use as an artificial soil medium.

The strength of this expanding horticultural market led us to seek out additional relatedgreenhouses products... reed mats from Austria were used for shade house areas to harden off tender plants from the propagation houses before being moved to the open field, kelp meal from Norway was used as a rich source of trace minerals and micronutrients, burlap and pinning nails were imported for use in ball and burlap preparation of field grown stock for market.

Working closely with the various State Agricultural Extension Services put us in contact with the State Agricultural Colleges. Through this association, we began to recognize the need for a line of affordable, functional, easy to build greenhouses, which would appeal to the hobby market and also to the secondary and post-secondary Vocational-Technical Schools and many other applications throughout the country.

As is the case today, there were many high-end aluminum/steel and glass greenhouses at the university level, but the budgets weren't available for these higher quality, more costly greenhouses at the secondary and post-secondary vocational level.

Wm. T. Sierke  -  Co-FounderSo we began experimenting with various styles of greenhouse designs and materials. Over time, we finally settled on the Gothic Arch style because of its strength, good looks and optimum light and heat transmitting properties, and for its ease of construction.

Our first effort at the Gothic Arch was a very inexpensive hobby size structure made from a light-weight frame of thin plywood strips and covered with a short-lived poly-film plastic. We really liked the gothic design but in order to offer a more substantial, durable product, we enhanced and strengthened the framing from plywood, to long-lived, energy effici ent redwood. We also increased the size of the framing to accommodate a rigid plastic cover. We adapted the small hobby size units to appeal to a broader market base.

gothic arch commercial greenhousesOur greenhouses are no longer constructed from redwood, because it is such an endangered resource. We now offer heart cypress for our framing, which is locally produced and plentiful.

For any questions, comments, or concerns please email us at

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