The cherries in Greenwich Park are at their loveliest and if you are nearby and able to get there I recommend a visit :) This one is a short walk inside Chesterfield Gate (amazing one at the gate too) and further into the park is the row of cherry trees which also look like this (but will be packed with tourists and Instagram influencers).
https://www.flickr.com/photos/jodiepedia/54447066320
Jo