Chelsea Flower Show's smaller gardens have quirky and environmental themes

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chelsea flower

credit: Bonnie Alter

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Those large and horrible looking covers on the oak trees are meant to give a vivid impression of the impact of the Oak processionary moth. The disease, OPM, affects young oak trees. Imported from Europe, the moths spin cocoons that can decimate the trees. The caterpillars move from one tree, eating all the leaves, and going onto the next. They can withstand extreme weather conditions, including drought and floods. Yuck.