I visited Phipps more than five times this past year. Every time I've went, it's even more beautiful. I love it there. I have a duel membership, which saved me and my family a lot of money. I would suggest getting one if you plan on going twice in a year.
They constantly have different things going on, and of course all of the flowers change fairly quickly. My first two visits were in the springtime when they had all of my favorite flowers. I saw the completed green roof in the summer, and I just recently saw the holiday lights at nighttime. I was blown away by the outside portion. Everything is so relaxing, and it's a perfect date night.
If you're under 21, do some research before you go on Friday nights. Sometimes there's drinks and music in the back room where the Congo is and you won't be allowed to go inside.