RHS Garden Harlow Carr is about a mile and a half from the centre of Harrogate. Here is the address:
RHS Garden Harlow Carr,
Between July 22nd and September 3rd 2023 the X6 bus will run an extended service to RHS Garden Harlow Carr. The closest bus stop is on Otley Road (around a 5-minute walk from the garden entrance), with buses running from Harrogate bus/train station every half hour. The service also stops at the White Hart hotel bus stop.
A lovely walk runs from Valley Gardens in Harrogate, up through the Pine Woods to RHS Garden Harlow Carr, taking around an hour at a leisurely pace. You can download a detailed map here.
For more information on getting to RHS Garden Harlow Carr, check out their website.