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... Ashley- do they dig up your plants to do their burying? The most they do here is sit on a rock or piece of wood in garden beds occasionally to eat spruce cones- or at times when they drop thousands of cones from the tree tops, they may pile in garden edges.
Fortunately they don't dig stuff up or cause any harm in my garden Cohan but I've heard that elsewhere (grey?) squirrels excavate crocus corms etc. so gardeners must use wire mesh as a deterrent.As you say, red squirrels love both spruce & pine cones. Here they really binge on green cones from about July onwards & leave great numbers of 'cores' under pine trees particularly. Besides cones and acorns they also eat apples we leave out for the birds, lichen on tree branches as well as freshly emerged oak/maple leaves and flowers before increasing tannin levels make them too bitter. Apparently squirrels also plunder nests when the opportunity arises & indeed birds around the garden seem to keep a particularly close eye on the squirrels during the breeding season.