One such oddity is the walled garden. The protective high brick walls create a sheltered micro-climate. In this environment they could grow things that would not normally grow in England.
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Some walls had small doors in them, or even fire places whereby the gardener could control the temperatures by using a stove inside the hollow wall and letting heat escape into the garden. Very ingenius and allowing peaches, nectarines and grapes to be grown as espaliers against south-facing walls.
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Espaliers were a way of coaxing a tree to grow against its own shape and nature. They trained it up against the wall very carefully and so when grown it would look like it was meant to be that way. The heat and sun could reach every aspect this way.
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Walls also kept out the animals. In a lot of the big estates that had these types of gardens, they used sheep or deer to keep the lawns immaculate. The walls kept them from eating the produce or trampling the flowers. Did you ever wonder how they kept the grass cut before the lawn mower? I am guessing here but seems logical to me. Back in the days when the great homes of England had a huge staff, the food was usually home grown. So a walled garden was for fruit and vegetables. Now they are mostly flower gardens, but some still grow their own food. We visited the gardens at Chartwell and there is a walled garden there. Winston Churchill was a hands on man when it came to his garden. Deer do not do the damage to lawns that a horse or cow would. Sheep have to be moved around because they crop close.
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My Dad taught me a lot about gardens, didn't really teach me but answered my questions. Although our humble council house had a big garden it was only enclosed by fences and hedges. He did try his hand at manipulating our apple tree though and it grew flat like an espalier would. The best apples ever. I don't think they ever got ripe. They were gone as soon as edible. He taught me about grafting and so many things I would never need to know. He enjoyed it. He did gardens for others who had the money to put into them and he took great pride in doing so. That was his weekend relaxation that earned him a little for his pint down at the pub of an evening.
Nowadays the walled gardens in many stately homes make wonderful flower gardens. We were at Hever last year and they make wonderful environments for growing Roses
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If I had the time and money I would love to make a hobby of visiting all the stately homes in England and the British Isles. Scotland has some lovely ancient walled gardens.There were many abbey's and monasteries that made use of the idea too, even small cottage gardens may have walls around. Even a hedge or fence can have its effect by keeping the wind at bay. It takes something a bit more substantial to take care of frost though. Anyway, to me this is a fascinating subject but I better stop before eyes begin to glaze