The 3 acre garden is open to the public, free of charge.
I've been here many times and never ever get bored.
Most of their plants are grown at Hill House and there are expert staff
at hand, to help you with your gardening problems etc etc..I know because I listened in (!) on one of the bits of advice! However, that was in one of the glass houses and I found myself getting hotter and hotter so eventually had to leave!
You will not be disappointed!