Pauline Taylor said her grandchildren “will be wowed by it”.
“Our allotments are just down there, so everybody puts it on the website, ‘oh my God we’ve got a Banksy’. In Kew, can you believe it?” she said.
“Thank you, Banksy,” Ms Taylor added.
The artist, whose identity is unknown, last painted in the capital in Finsbury Park when he sprayed green paint on a wall behind a cut-back tree to look like foliage, with a stencil of a person holding a sprayer next to it.
