This is quite large botanical gardens. There's almost no way one can go through the whole place in a day. However, if you don't have that expectation, then this is a very nice way to spend your morning or afternoon, in peace, and surrounded by beauty.
When I was there, there was an exhibition throughout the grounds, sculptures made out of plants, shrubs, trees. They were all gorgeous, but I believe they have been removed now. A couple that I remember was a very large pot, spilled over with dirt and plants, being pollinated by honey bees made out of flowers. Another was a old pickup truck being loaded by a man, who was made of shrubs, holding crates of flowers.
Also, I believe that if you purchase tickets, then you can come again another day with the same ticket (effectively, its a two time ticket). You might want to double check, but I was able to do it.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.