Time Out says
Discover London's secret gardens at this weekend of viewings and openings
In 2019 more than 200 gardens will unlock their gates for a whole weekend to take part in this annual event. Spanning 27 boroughs, the gardens take in all sorts of spaces, from traditional squares to roof terraces and allotments, as well as gardens belonging to historic buildings, schools, shops and cafes. Hundreds of the gardens taking part this year are normally closed to the public. A range of walking and cycle tours, special garden tours, family activities, art trails and poetry events will be announced closer to the weekend.
Some participating venues may only be accessed when booked onto a tour (£3) – snap up your place when booking your weekend ticket to make sure you don't miss out. Please note: one ticket allows entry to all venues over the weekend.