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During an enjoyable day scouring for new plants at a horticultural trade show last week, several growers told me about a devastating new fungal disease killing off busy Lizzies in parks and gardens up and down the country.Impatiens downy mildew

-nitrogen fertiliser as it encourages soft, leafy shoots, which are easily infected by fungal diseases.I'll also practice crop rotation, so my garlic, leeks and onions will not be grown in the same plot of ground as last year. I’ll need to keep a close eye on my chives