20. The gunnera

21. Philip Pullman

The celebrated author shares his passion for the Botanic Garden and reads from the end of the His Dark Materials trilogy.

20. The gunnera

The plant growing on the island in the lower garden pond.

19. Green gardening

The new Merton borders - the latest Botanic Garden experiment.

18. The Madagascan palm

The palm that's not a palm!

17. Same or different?

A cactus and a euphorbia - an example of convergent evolution.