These bugs are commonplace in British gardens, often basking on leaves in the sun. Being true bugs (see this post for further explanation here) they bite into the stalks of plants to drink the sap. However, they do not cause any significant damage. Their American cousins are known as stink bugs. The UK bug has a distinctive dark patch on the bottoms of the wings, unlike the recent invader from Europe, the Southern Green Shield Bug.
They hibernate through the winter as adults, then after mating, lay eggs underneath leaves. After hatching they go through a wingless nymph stage, before developing into the adult form. I found one nymph lurking in amongst my St John’s Wort.
It seems that these bugs are spreading north into Scotland due to the warming climate…
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