I can't imagine anyone would merely take 30 minutes to see the gardens. If you ran through the greenhouses alone it would be 30 minutes and not really looking at a single tropical plant or sniff an orchid. Outdoors the two gardens are a nice walk; one has specialty gardens, the other a woodland tract that is magnificent in April/May when ...

Just a great variety of interesting plants in one place - and its free! The greenhouses take about 20 minutes to go through, but to see all the outdoor gardens takes at least an hour - so I disagree with the time estimate of the other reviewer. No, not a day-trip, but an impressive garden to spend a couple hours in if you are in the area. Very enjoyable!