Plants differ as to the amount of light they require; for example, the African violet (Saintpaulia) prefers some shade in summer, whereas pelargoniums revel m the sunlight. Blinds allow the gardener to provide and remove shading whenever necessary, Blinds may be fitted inside or outside the greenhouse and are invariably operated by hand; for this reason they have some of the same drawbacks as hand ventilation—for instance, when the gardener must be absent for any length ot time.

Before fitting blinds it is as well to consider whether they are essential to the plants being grown. Many gardeners fit blinds to overcome wilting when in fact the problem lies in inadequate ventilation and/or unhealthy root growth.

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Building Your Own Greenhouse

Building Your Own Greenhouse

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