Strawberry Garden

I have another query about the letter.
The writer states –

“I have refused to go to the Strawberry garden,…”

The fact that the garden was close enough to walk to, or she could have taken a coach suggests that the garden was not part of the land around the house.

Might these be Liverpool’s famous strawberry fields?

Or were they a 20^th century invention by the Beatles?

Thanks

Cliff