Types of Greenhouses

Objectives 1. List and describe the different types of greenhouses on a quiz with 85 % accuracy. 2. List common framing materials used in greenhouses on a quiz with 90% accuracy. 3. Compare basic types of greenhouse coverings on a quiz with 80% accuracy. 4. Describe the uses of cold frames on a quiz with 80% accuracy.

Reasons To Learn Why are there different types of greenhouses? Why do we need to know the different types of greenhouses? Why are there different materials used to frame greenhouses? Why are there different materials used to cover greenhouses? Why do we need to understand what a cold frame or a hotbed is?

Questions To Answer What are some different styles of greenhouses? What are some factors to consider when choosing a greenhouse? What are some factors in choosing the framing material for a greenhouse? What is glazing? What is a cold frame? What is a hotbed?

Lean-to Greenhouse Advantages Disadvantage Cheapest Easier Instillation More Obtainable Space Disadvantage Limit Sunlight Limited Plant Growth Difficult to maintain temp Limited Ventilation

Even Span Advantages Disadvantages Common Easy to find tables Easy to heat and ventilate Can add on to Disadvantages Expensive More space needed

Uneven Span Advantages Disadvantages Can be built on hill sides If constructed well can cut energy costs Disadvantages Difficult to find equipment for Difficult to add on to

Quonset Advantage Disadvantage Easier installation Low cost because of covering Disadvantage Appearance for home gardener Allows for only inexpensive cover

Gothic Arch Advantages Disadvantages Inexpensive Is good for shedding snow More attractive Disadvantages Less head room More difficult to build than Quonset

Ridge and Furrow Advantages Disadvantages Large capacity Lower energy cost Ability to diversify plants Disadvantages Area needed to build Cost of building

Frame types Wood Steel Good Bad Good Bad Attractive Traditional Expensive Easily rotted Heavy Good Strong Inexpensive compared to aluminum or alloys Can use galvanized Bad Very heavy Rusts

Frame Types cont. Aluminum Alloys Good Bad Non corrosive Low maintenance Bad Expensive Lower retention of heat

Greenhouse Project Get into your groups. Each group needs a poster board. Discuss with your group what type of greenhouse your group wants to desgin Each group needs choose

Greenhouse Glazing Polyethylene Glass Rigid structure sheets Most common Cheapest form of cover Glass Best light transmission Most expensive Rigid structure sheets Expensive High impact resistant Weather resistant

Cold Frame vs. Hot Bed Both used to protect small plants and seed protected from the weather. Cold frame uses only sunlight for heat Hot bed uses other sources for heat as well as sunlight