English landscape gardener who often joins 2 in conversation (6)

I believe the answer is:

jekyll

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'english landscape gardener' is the definition.
'jekyll' can be an answer for 'gardener' (I've seen this before). I'm unsure of the 'english landscape' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for jekyll that I've seen before include "Famous novel' Dr......and Mr Hyde'" , "Good doctor" , "Alter ego of 19 (Stevenson)" , "Potato heap; immobilise (car)" , "Famous novel 'Dr ...... and Mr Hyde'(6) ()" .)

I've seen this clue in The Independent.

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