Amazing place. I'm not even a huge gardener, but this is incredible. Make sure you see it. I went early to get one of the numbered parking spaces they mention on the street that are free. Their lobby opens at 9, and the attraction opens at 9:30. At 8:45 the parking spaces there were still mostly open on a Wednesday morning. They have an outdoor garden that is already open, so you could spend time there until they open. I was disappointed no one on staff could tell me which plants were from the original exposition, but this is an incredible place to see.