Greenhouse & Tunnel Supplies | Johnny's Selected Seeds

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Whether you grow from earliest spring to late fall or run your production year-round, our season-extension supplies provide the versatility and durability you need to protect your crops from the elements. We offer greenhouse film; benders and jigs for high tunnels and low tunnels; and supports, anchors, and hardware to keep it all together. Use our calculators and construction manuals to plan ahead, estimate costs, and determine the right season-extension configuration, components, and quantities.

Planning Tools & Calculators | Interactive Apps & Spreadsheets from Johnny's

44 Products

Snap Clamps for 1/2" EMT Hardware & Accessories

Snap Clamps for 1/2" EMT

Quickly fasten row covers to low tunnels.

Snap Clamps for 3/4" EMT or 1/2" PVC Hardware & Accessories

Snap Clamps for 3/4" EMT or 1/2" PVC

Quickly fasten row covers to low tunnels.

Cross Connectors – 2 Count Hardware & Accessories

Cross Connectors – 2 Count

Save time, money and make structures stronger.

Low Tunnel Hoop Bender – 4' Benders

Low Tunnel Hoop Bender – 4'

Create heavy-duty low tunnels that will last for years.

Snap Clamps for 1" PVC or Chain Link Fence Top Rail Hardware & Accessories

Snap Clamps for 1" PVC or Chain Link Fence Top Rail

Quickly fasten row covers to low tunnels.

Poly Patch Repair Tape – 4" Hardware & Accessories

Poly Patch Repair Tape – 4"

For everything from small patch jobs to splicing large sheets together.

Snap Clamps for 3/4" PVC or 1" EMT Hardware & Accessories

Snap Clamps for 3/4" PVC or 1" EMT

Quickly fasten row covers to low tunnels.

Low Tunnel Hoop Bender – 3' Benders

Low Tunnel Hoop Bender – 3'

Create heavy-duty low tunnels that will last for years.

Poly Patch Repair Tape – 6" Hardware & Accessories

Poly Patch Repair Tape – 6"

For everything from small patch jobs to splicing large sheets together.

Gothic Tunnel Hoop Bender – 14' Benders

Gothic Tunnel Hoop Bender – 14'

Bends Gothic arch-shaped bows to shed snow more efficiently.

Moveable Caterpillar Tunnel Hoop Bender – 12' Benders

Moveable Caterpillar Tunnel Hoop Bender – 12'

Bends 12' wide rigid half-pipe for DIY high tunnel. Lever bar included.

Bobcat High Tunnel Kit – Pro High Tunnel Kits

Bobcat High Tunnel Kit – Pro

Build your own durable, professional-grade high tunnel.

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