It's Chelsea Flower Show week, which also means it's Chelsea in Bloom and Belgravia in Bloom week too. Floral installations, arches and sculptures appear across both areas for the free flower festivals — and handily, they're close together, so you can do both in one go. If you've only got time for one though, our tip would be Chelsea in Bloom — the installations are a bit more impressive, and the official map is more reliable than Belgravia's.
Belgravia in Bloom 2019
Chelsea in Bloom 2019