"JennyC" wrote in message
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"Jaques d'Alltrades" wrote in message
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The message
from Iain Douglas contains these words:

I've an oak tree about 25' tall growning at the side of my
garden. I want to raise the level of the garden about 18" on that
side.
Will the oak survive if I cover the lower 18" of bark or do I need to
protect it ?

Neighbours have levelled their garden by building patios. They had two
chestnut trees in the middle of one. They used rubble topped by scalpings,
then a layer of soil and turf. 3 feet of the chestnut tree trunks were
buried.
This was done more than than ten years ago and the trees are still healthy.
Doesn't mean it would be the same with an oak, though.