National Open Gardens Day
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Get into this serene secret garden for free thanks to this day of special openings as part of National Gardening Week. Green spaces all over the country which are normally closed to the public or usually charge an entrance fee will be offering free entry to all for one day only. Kensington Roof Gardens is the only venue taking part in central London, but check the National Gardening Week website for plenty more options that are slightly further afield.