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

42 Products

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Sale

Gothic Tunnel Peak Jig Benders

Gothic Tunnel Peak Jig

Quick Hoops™ Accessory

Bend gothic arch-shaped bows to shed snow more efficiently.

Sale

Snap Clamps for 1/2" EMT Hardware & Accessories

Snap Clamps for 1/2" EMT

Quickly fasten row covers to low tunnels.

Sale

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.

Sale

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.

Sale

Poly Patch Repair Tape – 4" Hardware & Accessories

Poly Patch Repair Tape – 4"

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

Sale

Cross Connectors – 2 Count Hardware & Accessories

Cross Connectors – 2 Count

Save time, money and make structures stronger.

Sale

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.

Sale

Poly Patch Repair Tape – 6" Hardware & Accessories

Poly Patch Repair Tape – 6"

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

Sale

Brace Band, 1 3/8" – 20 Count Hardware & Accessories

Brace Band, 1 3/8" – 20 Count

For securing the ends of collar ties and angle braces to bows.

Sale

End Rail Clamp, 1 3/8" – 10 Count Hardware & Accessories

End Rail Clamp, 1 3/8" – 10 Count

A very versatile piece of greenhouse hardware.

Sale

Poly Latch Wire, 4' – 20 Count Hardware & Accessories

Poly Latch Wire, 4' – 20 Count

Convenient system for securing high tunnel coverings.

Sale

Poly Latch Channel, 8' – 10 Count Hardware & Accessories

Poly Latch Channel, 8' – 10 Count

Convenient system for securing high tunnel coverings.

Bobcat High Tunnel Kit – Pro High Tunnel Kits

Bobcat High Tunnel Kit – Pro

Build your own durable, professional-grade high tunnel.

Bobcat High Tunnel Kit – Standard High Tunnel Kits

Bobcat High Tunnel Kit – Standard

Build your own durable, professional-grade high tunnel.

Automatic Ventilation Kit High Tunnel Kits

Automatic Ventilation Kit

Bobcat High Tunnel Kit Accessory

Thermostatically controlled venting system.

Sliding Door Kit High Tunnel Kits

Sliding Door Kit

Bobcat High Tunnel Kit Accessory

Easy tunnel access, even in snow.

Truss Support Kit High Tunnel Kits

Truss Support Kit

Bobcat High Tunnel Kit Accessory

Doubles the strength of the greenhouse.

Steel End Wall Kit High Tunnel Kits

Steel End Wall Kit

Bobcat High Tunnel Kit Accessory

Permanent solution for end walls — no need to replace wood!