Greenhouse Shading


Two or three hot days and I am glad I had already shaded my greenhouse from the sun.

It bis easier to remove in Autumn if you apply the cool-shade on the inside. For years I have struggled to clean the high apex from the outside!

Why Shade Your Greenhouse

  • Direct sun can bleach the chlorophyll out of plant leaves and leave them scorched.
  • Burnt and dehydrated plants will be distresses and will fail or perform badly.
  • Greenhouse trap heat and you can have too much of a good thing.
  • Keep the heat down but allow the maximum amount of light.

How to Shade your Greenhouse

  • The cheapest method I have found is to use Coolglass a powder you mix into a suspension and paint or spray on.
  • Old fashioned whitewash with a bit of size to make it stick is an old gardeners tip.
  • The aim is to keep down the heat whilst still getting the light so a thin covering is best.
  • You can use shade netting and there are many varieties available. Horticultural fleece may provide enough shade.
  • Roller blinds or wooden slatted blinds can be adjusted to suit the conditions each day.
  • Automatic blinds can be installed to suit many purses (that are reasonably full to start with).

Other Related Tips

  • Keep up the humidity in your greenhouse. In the morning and during very hot days I pour water on the floor.
  • Water plants at night so they can take up a drink for half the day and are turgid in the morning.
  • Avoid splashing the plants if watering during the heat of the day.
  • Remove the shading later in the year (end August) to help the last tomatoes ripen.
  • I only paint the South East and West faces of the greenhouse as you can see in the photo.

3 Responses to Greenhouse Shading

  1. Kelly Brown June 12, 2009 at 16.03 #

    Hi, gr8 post thanks for posting. Information is useful!

  2. Dave March 4, 2019 at 16.03 #

    Do you have experience in using the product on poly carbonate plastic greenhouses?


  1. Gardening Products » Blog Archive » Best Greenhouse Shading - April 25, 2010

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