The National Gardens Society have a wonderful programme of Open Gardens this month.
You can visit the many superb gardens around Kew Green, Lambeth Palace, Royal Trinity Hospice, the Hurlingham Club, the Water Gardens at Kingston, Garden Barge Square at Tower Bridge and more.
The azalea garden at 21 Arthur Road Wimbledon is open on 21 May and has superb views.
Find details of the gardens open near Sw15 this month here.
In June gardens at 40 Chartfield Avenue and 39 Hazlewell road will also be open.
Entry fees go to support NGS charities.