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However last winter I changed to privet for 2 months in a row, partly through laziness and partly because this was the only suitable easily obtainable plant. And guess what. They took it!
So let me amend my previous opinion. Leaf cutters do better on a variety of leaves. They certainly forage with renewed energy when they are given a different suitable species to cut. Their interest in the same leaf, day after day, becomes 'lazy'. But if forced, they will take a repetitive diet and not deteriorate. So I would say that the ideal offerings of different types of leaves can be restricted to summer and there may be no real harm done if they are given no choice in winter. There is a famous lab in Copenhagen, my son is working there just now, they have a very large collection of leaf cutters. All these colonies ever get is bramble leaves and apple, day about. And they do fine. So some comfort for those with a whacking great privet bush in their garden and no great desire to go hunting for alternatives!