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Greenhouse Guide | Supplies Guide | Grow Light Guide | Cold Frame Guide

Greenhouse Supplies Guide

Ventilation | Heating | Misting and Watering
Shading | Flooring | Benches

The Most Important Greenhouse Supply

What you may ask is the most important accessory you need to have for your greenhouse. A heater? Proper ventilation? While these may be necessary to provide the temperatures you want to maintain in the greenhouse, you are operating in the blind if you do not have a min/max thermometer to show you what temperatures your plants are experiencing in the greenhouse when you are not there. A min/max thermometer records daily high and low temperatures in the greenhouse. This is vital information that can tell you if your heating and/or cooling equipment is sized correctly and working properly in your greenhouse. Some thermometers also record highs and lows for humidity as well. This is a helpful feature for plants that require specific humidity levels like orchids. View greenhouse thermometers

Ventilation / Cooling

Ventilation has two important purposes: providing fresh air, mainly carbon dioxide, to plants and cooling for the greenhouse. Greenhouses are really designed to store heat from the sun during the day creating a warmer temperature in the greenhouse versus outside of it. This makes cooling a greenhouse on a hot day a difficult task that can not be accomplished without a good ventilation system. Cooling in the summer can be accomplished most easily with a combination of shade, proper ventilation, and an evaporative cooling system like a misting system, fogger, or evaporative cooler.Even using all of the items mentioned above you can expect a greenhouse to still not be much cooler if any than the outside temperature in hot humid areas.  

Greenhouse Fan & Shutter An exhaust fan ventilation system usually consists of a fan setup to blow hot stale air out of the greenhouse and bring fresh cooler air inside the greenhouse via intake shutters mounted on the opposite end of the structure (Shown in picture). An exhaust fan system should be able to make a complete change of air in 1 to 3 minutes (about 1 minute or less for small greenhouses) in summer to keep temperatures in the greenhouse at a reasonable level. If you aren't sure what size fan or shutters you need, use our Fan & Shutter Size Calculator.

Many people use roof and/or side vents to supply fresh air to plants and cool their greenhouse. This is ideal for venting during cold months, because if used with automatic vent openers, fresh air can be supplied to plants gradually reducing any "temperature shock" to plants. HAF circulation fans are highly recommended for use with side and/or roof mounted vent systems. The increased air movement helps to expel hot air out of the window vents and provide fresh air for plants.

Unless you plan on staying in your greenhouse 24 hours a day 7 days a week, you should consider automating your ventilation system. Forgetting to vent your greenhouse one hot day could fry every plant in it. Thermostatic controls and solar powered autovents will also maintain a more consistent temperature in your greenhouse which promotes healthier plant growth. In hot climates shading and misting equipment may be necessary to hold the greenhouse's temperature in check. Winter ventilation needs are lower. View ventilation supplies


The heating requirements of a greenhouse depend on the desired temperature for the plants grown, the location and construction of the greenhouse, and the total outside exposed area of the structure. Heating systems can be fueled by electricity, gas, oil, or wood. The choice of a heating system and fuel depends on what is locally available, the production requirements of the plants, cost, and individual choice. Heating requirements for your greenhouse can be determined with our Heater BTU Calculator.

If you're using your greenhouse to start seedlings and root cuttings in the spring, supplemental heating probably will not be necessary. In mild climates, 12' x 12' and smaller model hobby greenhouses can be adequately heated with electric heaters (make sure electric heaters are not exposed to water to avoid a dangerous shock). An electric heater is clean, efficient, and easy to install and maintain. Small gas heaters will also work well in hobby greenhouses. With larger size greenhouses and cold climates where temperatures regularly fall below freezing, larger gas greenhouse heaters are most commonly used because it is cheaper to heat with gas than electric in most areas. A highly recommended item for use with any greenhouse heating system is a heat circulation fan. They gently move the hotter air in the peak of the greenhouse to plant level helping to maintain an even temperature in the greenhouse and increasing the efficiency of your heating system. View heaters 

Misting and Watering

Misting and fog systems have a variety of uses in a greenhouse. It is important to determine what you want to accomplish with a misting system before purchasing one. Humidity: It is important to maintain a healthy humidity level (50% to 70%) in a greenhouse. Fog and Misting systems with fine nozzles are very effective at providing additional humidity because their smaller water particles evaporate more quickly. Evaporative Cooling: Misting systems are a great low cost solution to help cool greenhouses with a fine mist that lowers air temperatures when it evaporates. Smaller nozzles work best for cooling also. An evaporative cooler is the most effective cooling solution offered other than installing an air conditioning system. It is a closed system that keeps water inside the cooler and only exhausts the cooled air into the greenhouse. Watering: Cuttings and seedlings are commonly watered with small overhead sprinkler or misting systems or mist nozzles for hoses because watering with a regular wand or watering can may disturb the surrounding soil causing plants to take longer to root. Drip systems are an effective way to water larger plants without wetting the foliage. Another advantage to drip systems is that they use very little water when compared to overhead watering systems. View misting, sprinkler, and drip systems


Shade covers are the way professional growers keep their greenhouses cool during those long hot summers. They block a percentage of the sun's rays from entering the greenhouse which can reduce temperatures over 20% alone. Shade covers are relatively inexpensive and also provide shade for plants that don't grow well in full sun. The amount of shading necessary varies depending on greenhouse location, your local climate, and the light requirements of the plants in the greenhouse. Most greenhouse shade cloths fall in the 45% to 70% shade range. When buying a shade cover remember, more is not always better. Excessive shading can slow plant growth and cause plants to stretch. View shade covers


The floor of your greenhouse is both functional and aesthetic. It forms the surface you walk on and helps complete the image of the greenhouse. The walkway and the area under the benches are usually two different materials. The walkway should form a firm nonskid surface for walking, be easy to clean, and be durable enough to withstand constant moisture and dirt. Common materials used for a walkway include concrete, brick, stone, gravel, wood slats, and ground bark. The area under the benches is usually covered by a porous material that can be dampened to help provide humidity and should allow easy drainage of water. For under bench areas, consider gravel, sawdust, ground bark, or any other porous material. You will want to lay a sheet of woven weed barrier (ground cover) under the floor covering to prevent weed growth, because weeds harbor many pests and diseases. For more information, take a look at our guide on building a foundation and floor.


You will want benches in your greenhouse. They make a world of difference in the ease of gardening and add a lot of extra working space to your greenhouse. Benches also provide the area under them with plenty of shade which is an ideal environment for many plants. Greenhouse bench tops should have an open design which allows water to drain and fresh air to flow through them. View benches  

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