My Surrey location is no help to the OP, but for other readers ...
My Morrisons 10 year old lollipop olive is hardier than my baytrees and agapanthuses. Close to the house, a fleece thrown over the top; just a touch of singeing. I am stiil working out how to prune to keep its shape as it wants to grow straight up.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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My Morrisons 10 year old lollipop olive is hardier than my baytrees and agapanthuses. Close to the house, a fleece thrown over the top; just a touch of singeing. I am stiil working out how to prune to keep its shape as it wants to grow straight up.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."