I have visited the gardens 3 times now, all in various times of summer (June, July, August) and it is consistently good, but not great. This last time (Aug. 2), the weather was quite warm (around 90 F), and the gardens showed the effects of the heat. It is always crowded, and this time was no different. The fact that it is in an old quarry gives it much more visual appeal than a flat garden. However, it is over-hyped, and doesn't live up to that standard.
Wear comfortable shoes, and be prepared for either rain, lots of sun, or both. An umbrella works well for either. Part of the garden has no shade at all nor shelter if it rains. I would say bring a small day pack or backpack with water, an umbrella, and snacks. Allow at least an hour-two hours if this is your 1st visit. Be prepared for lots of steps to navigate.
There are food vendors, a gift shop, and ample public toilets. Seating is at a premium, however, as there are a lot of other visitors with whom to compete.
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