Holistic Remedies discussion

Holistic RemediesFor a Healthy Greenhouse Supply Good Air Ventilation

For optimal functioning of your greenhouse, supply sufficient air ventilation at all times.

The air inside a greenhouse is heated by re-radiation of solar energy by objects inside the greenhouse, or, sometimes, by means of artificial heating.

It may reach a point where the temperature inside the greenhouse grows uncomfortably high for the plants. If this happens, you need to implement a good greenhouse ventilation system to exchange some of the warm air inside for cooler air from outside.

Because warm air rises, it is convenient to allow it to escape through vents at the highest point of the greenhouse. Cool air can gain access through natural means - for instance, leaks where glass overlaps - or through side vents set lower down in the sides of the greenhouse. It's especially important to provide lean-to or circular greenhouses, or greenhouses used to grow alpine plants, with an adequate fresh air supply.

A rule of thumb for small greenhouses is that the vents should be equal to 25 - 30 percent of the floor area.

It's best to have an automated system to control the opening and closing of vents. This can be achieved by thermostatically controlled electric motors, or, on a smaller scale, by expansion vent units. Roof vents are best positioned alternately on both sides of the roof, with side vents set to match. Don't forget - if side vents are placed at ground level, you need to cover them with wire netting to prevent unwanted guests like mice or cats from gaining access to the greenhouse.

To prevent cold or wet spots, circulating fans can be used to mix the air inside the greenhouse. Extractor fans will pull air out of the greenhouse, and you obviously need a means of allowing fresh air in to replace the lost air. It's possible to use fans to pull air into a greenhouse, but, in practice, extractor fans work more reliably. Air vents are the normally preferred means of allowing air in.

Extractor fans are controlled by an air thermostat - and they must be large enough to move sufficient quantities of air. A good greenhouse supply retailer should be able to recommend the best type of fan for your requirements. Normal domestic extractor fans are not suitable - those used in greenhouses have larger blades which turn more slowly.

Moisture jets or absorbent pads can be used alongside fans to add or remove moisture from the incoming air to help maintain the correct humidity level in the greenhouse atmosphere. With a little planning and forethought it's quite easy to maintain a good greenhouse supply of fresh air to keep your plants happy!

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Expert opinions vary about the effectiveness of vitamins, minerals, herbs and other plant products for preventing and/or treating the common cold. Thousands of clinical studies have been performed, but results are not always reproducible. For example, two recent studies support the use of zinc nasal gels to reduce the duration of common cold symptoms, but one contradicts those findings and suggests that it is unethical to recommend a product that can cause permanent loss of the sense of smell to treat a temporary condition like the common cold. All of the studies were performed by reputable researchers, with no motive other than to help and inform the public, but when scientists cannot agree on an appropriate treatment, it leaves the general public more confused.

Health supplements that are safe and can help prevent common colds by supporting normal immune system function include; vitamin C (which works best when taken with calcium and magnesium), zinc supplements (which at normal dosages and taken in tablet form do not cause adverse side effects), green tea (a subject of numerous studies), Andrographis paniculata (which reduces flu symptoms and the likelihood of developing complications from viral infections), and many other natural substances. To learn more about how to reduce common cold spread, visit the Immune System Booster Guide.
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