The gardens you are about to see are from this castle, which is on an island you get to by this causeway—unless the tide is in, in which case you take a boat. Or swim. Which is frowned upon because you'll get the castle carpets wet.
You can read all about this castle in the Cottages & Castles section, but the gardens are worth their own page. Actually, every single thing about St. Michael's Mount is worth its own page, but as we're in a "gardens" post probably we should just stick to the flowers.
Hahahahaha. I have no idea what that even means.