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Purpose of Cold Frames
Harden seedlings; production of low-growing Cole crops
Characteristics of Cold Frames
Temporary Structure
Unheated
Designed for maximum light harvest
Designed to use passive cooling
Purpose of Hot Beds
Harden seedlings; production of low-growing Cole crops
Characteristics of Hot Beds
Temporary Structure
Heated
Designed for maximum harvest of light energy
Designed to use passive cooling
Purpose of High Tunnels
Protect plants from suboptimal temperatures
Description of High Tunnels
Hoop structures placed over plant rows; remain in place until conditions improve
Characteristics of High Tunnels
Film Plastic
PVC ribs to support structure
Varying thickness
Ventilation
Quonset Greenhouse
Most economical design
May be short or tall-sided
Most common design
Facilities film coverings
Even-Span Greenhouse
Roof pitches are equal
Side wall height from 8-25ft
Covered with ridged plastic
Greenhouse Cultural Systems
Organic
Hydroponics
Aquaponics
Protected Structures for Organic Production
Uses soil and compost as substrates
Grow plants in ground or containers
May be heated (or not)
What is hydroponics?
culture of plants in a nutrient rich liquid medium with or without an inert support substrate
Why use hydroponics?
Improves plant yield
Reduced insect and disease problems
Conserve water and nutrients
Reduced labor
Plant environment can be easily controlled
