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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Ground Post Driver Hardware & Accessories

Ground Post Driver

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

Univent Automatic Opener Vents and Vent Openers

Univent Automatic Opener

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

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.

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.

Tufflite IV™ – 28' x 125' Tufflite™

Tufflite IV™ – 28' x 125'

Greenhouse Film

28-feet wide x 125-feet long

Tufflite IV™ – 28' x 65' Tufflite™

Tufflite IV™ – 28' x 65'

Greenhouse Film

28-feet wide x 65-feet long

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.

Tufflite IV™ – 20' x 65' Tufflite™

Tufflite IV™ – 20' x 65'

Greenhouse Film

20-feet wide x 65-feet long

Tufflite IV™ – 28' x 100' Tufflite™

Tufflite IV™ – 28' x 100'

Greenhouse Film

28-feet wide x 100-feet long

Automatic Ventilation Kit High Tunnel Kits

Automatic Ventilation Kit

Bobcat High Tunnel Kit Accessory

Thermostatically controlled venting system.

Tufflite IV™ – 32' x 100' Tufflite™

Tufflite IV™ – 32' x 100'

Greenhouse Film

32-feet wide x 100-feet long

Sale

Tufflite IV™ – 20' x 125' Tufflite™

Tufflite IV™ – 20' x 125'

Greenhouse Film

20-feet wide x 125-feet long

Sale

Tufflite IV™ – 24' x 125' Tufflite™

Tufflite IV™ – 24' x 125'

Greenhouse Film

24-feet wide x 125-feet long

Hoop Bender Hitch Mount Benders

Hoop Bender Hitch Mount

Quick Hoops™ Accessory

Ultimate portability for your low tunnel benders.

Sidewall Hand Crank Hardware & Accessories

Sidewall Hand Crank

Quickly adjust tunnel sidewalls and hold them at desired height.

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!

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.