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

Bobcat High Tunnel Kit – Standard High Tunnel Kits

Bobcat High Tunnel Kit – Standard

Build your own durable, professional-grade high tunnel.

Bobcat High Tunnel Kit – Pro High Tunnel Kits

Bobcat High Tunnel Kit – Pro

Build your own durable, professional-grade high tunnel.

Sale

Low Tunnel Hoop Bender – 3' Benders

Low Tunnel Hoop Bender – 3'

Quick Hoops™

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

Sale

Low Tunnel Hoop Bender – 4' Benders

Low Tunnel Hoop Bender – 4'

Quick Hoops™

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

Sale

Gothic Tunnel Hoop Bender – 14' Benders

Gothic Tunnel Hoop Bender – 14'

Quick Hoops™

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

Sale

High Tunnel Hoop Bender – 12' Benders

High Tunnel Hoop Bender – 12'

Quick Hoops™

Bends 13-14' wide hoops that compress into ground posts for high tunnel.

Sale

Moveable Caterpillar Tunnel Hoop Bender – 12' Benders

Moveable Caterpillar Tunnel Hoop Bender – 12'

Quick Hoops™

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

Sale

Low Tunnel Hoop Bender – 6' Benders

Low Tunnel Hoop Bender – 6'

Quick Hoops™

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

Automatic Ventilation Kit High Tunnel Kits

Automatic Ventilation Kit

Bobcat High Tunnel Kit Accessory

Thermostatically controlled venting system.

Sale

Tufflite Nursery Clear™ – 10' x 100' Tufflite™

Tufflite Nursery Clear™ – 10' x 100'

Greenhouse Film

Preferred winter covering for Quick Hoops.

Sale

Ground Post Driver Hardware & Accessories

Ground Post Driver

Prevents ground posts from deforming. Fits into 1 5/8" ground post.

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High Tunnel Vent w/ Auto Opener – 30" x 30" Vents and Vent Openers

High Tunnel Vent w/ Auto Opener – 30" x 30"

Provides additional greenhouse ventilation in hot conditions.

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High Tunnel Vent w/ Auto Opener – 18" x 18" Vents and Vent Openers

High Tunnel Vent w/ Auto Opener – 18" x 18"

Provides additional greenhouse ventilation in hot conditions.

Sale

Tufflite IV™ – 28' x 125' Tufflite™

Tufflite IV™ – 28' x 125'

Greenhouse Film

28-feet wide x 125-feet long

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High Tunnel Vent w/ Auto Opener – 12" x 12" Vents and Vent Openers

High Tunnel Vent w/ Auto Opener – 12" x 12"

Provides additional greenhouse ventilation in hot conditions.

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Tufflite IV™ – 20' x 65' Tufflite™

Tufflite IV™ – 20' x 65'

Greenhouse Film

20-feet wide x 65-feet long

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Univent Automatic Opener Vents and Vent Openers

Univent Automatic Opener

Keep your cold frame plants in their "comfort zone."

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Tufflite IV™ – 24' x 65' Tufflite™

Tufflite IV™ – 24' x 65'

Greenhouse Film

24-feet wide x 65-feet long

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Univent Automatic Vent and Window Opener Vents and Vent Openers

Univent Automatic Vent and Window Opener

Universal, for greenhouse and cold frame applications.

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Tufflite IV™ – 32' x 100' Tufflite™

Tufflite IV™ – 32' x 100'

Greenhouse Film

32-feet wide x 100-feet long

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Tufflite IV™ – 28' x 100' Tufflite™

Tufflite IV™ – 28' x 100'

Greenhouse Film

28-feet wide x 100-feet long

Sale

High Tunnel Vent w/ Auto Opener – 24" x 24" Vents and Vent Openers

High Tunnel Vent w/ Auto Opener – 24" x 24"

Provides additional greenhouse ventilation in hot conditions.

Sale

Tufflite IV™ – 28' x 65' Tufflite™

Tufflite IV™ – 28' x 65'

Greenhouse Film

28-feet wide x 65-feet long

Sale

Tufflite IV™ – 20' x 125' Tufflite™

Tufflite IV™ – 20' x 125'

Greenhouse Film

20-feet wide x 125-feet long

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Tufflite IV™ – 24' x 125' Tufflite™

Tufflite IV™ – 24' x 125'

Greenhouse Film

24-feet wide x 125-feet long

Truss Support Kit High Tunnel Kits

Truss Support Kit

Bobcat High Tunnel Kit Accessory

Doubles the strength of the greenhouse.

Sliding Door Kit High Tunnel Kits

Sliding Door Kit

Bobcat High Tunnel Kit Accessory

Easy tunnel access, even in snow.

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!

Sale

Sidewall Hand Crank Hardware & Accessories

Sidewall Hand Crank

Quickly adjust tunnel sidewalls and hold them at desired height.

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Hoop Bender Hitch Mount Benders

Hoop Bender Hitch Mount

Quick Hoops™ Accessory

Ultimate portability for your low tunnel benders.

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.

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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 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 – 4" Hardware & Accessories

Poly Patch Repair Tape – 4"

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

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

Cross Connectors – 2 Count Hardware & Accessories

Cross Connectors – 2 Count

Save time, money and make structures stronger.

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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.

Poly Latch Channel – 8' Hardware & Accessories

Poly Latch Channel – 8'

Convenient system for securing high tunnel coverings.

Out Of Stock

Poly Latch Wire – 4' Hardware & Accessories

Poly Latch Wire – 4'

Convenient system for securing high tunnel coverings.

Out Of Stock