Sunday was wash time for the birches as well. We have over twenty white stemmed birches Betula utilis 'Grayswood Ghost' which gather green algae over the year and when we get the power hose out to clean the paviours, (prior to our winter open day, this year on Feb 14th) we also take the hose to the birches and with a powerful jet of water they come up as good as new. It takes about ten minutes a tree, and I get soaked. Its a good job I have wet gear on, but the trouble is the taller they get the higher I have to go with the spray; and you can guess its not a warm job in January!
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