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berberis sawfly box blights biodiversity climate change companion planting composting conifer hedge dieback conservation of species diseases in the garden environmental concerns genetic modification hazardous garden plants heavy metal accumulation hemerocallis gall midge honey fungus lawn care limestone mulches naturalistic planting: the wild garden organic & sustainable gardening peat and the gardener pests in the garden plant breeding plant identification plant naming Phytophthora root diseases rose black spot rosemary leaf beetle scarlet lily beetle soils & soil analysis sudden oak death water gardening water-wise gardening weeds in the garden wildlife gardening worm composting