Archive for March, 2008

Trees as Air Conditioners

We are into March.  The Autumn colours are just starting to peep through in some plants and others seem in quite a hurry to get into their winter gear!  I must confess I do enjoy the rose hips, the berries, the yellows and russets of the helleniums and rudbeckias, and then of course a bit of relief from the searing February sun. 

The following information comes from an article from the Farmer’s Weekly dated 9/07/1993 about trees being natural air conditioners.

Trees planted around a house so their branches overhang the roof, keep the temperature down to an agreeable level inside, and they do more.  They humidifyand freshen the atmosphere and encourage the gentle movement of air.

Functioning as a fountain the tree draws many litres of water from the soil – often more than 1 000 litres a day – and evaporates them through its leaves into the air.  Each tree then, during the daylight hours, is enveloped in a blanket of water vapour under which one is cooled and refreshed.  Some species like the willow pump out water through the leaves in the form of finely divided droplets in a mist which may be felt on the hands and face, and in certain lights seen.  When a slight breeze is blowing, the temperature under such a tree measures 5 – 10 degrees C less than the temperature outside of its canopy.

With this information I realise that I need to plant lots more trees.  There are areas of the garden that could do with a little air conditioning!

March 16, 2008 at 7:57 pm Leave a comment


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