At any time. You can spend the entire day
I believe you will enjoy it more in the morning during summer. The temperature is cooler and the chance for rain is higher in the afyernoon. Even for first time visit, half day is usually enough.
Spend the entire day there, it's that amazing. There's a restaurant, and cafe there. You will be mesmerized. Every Thursday, the garden closes at 9:30 p.m., I would suggest going then because the magnificent graden structures (dragon, princess, mammoth, camels, mermaid, goddess, shaggy dog, peacok, and the Phoenix) aluminate at night.
Mornings are great, especially for the outside gardens; have some lunch; then spend the hottest part of the day in the orchid pavillion (still kinda warm)
Anytime is great but I personally recomend about 10am. You can spend all day here . Pack a lunch if you like or they have a location you can stoo and snack . Great place to spend the day.
Depending on the weather morning or afternoon is great and yes obviously it is a great all day experience
There's a lot to do at the Gardens, plus there are places to sit down and eat or have a quick snack. For summer I'd try to get out early or late in the day, but you can spend the entire day there.
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