Okay, now I JUST found this out, so i'm terribly sorry if it doesn't work. It started blowing in Object Maker, and I flipped out, and decided to share it with you!:D Let me know if this doesn't work! Also, I only did this with my tree's, so i'm not completely sure if it works with plants, so don't blame me if it doesn't. Okay! Here is what you need to do!
1. Make sure you have FH+. If you don't, download it. It is found in the Download section on the website. It doesn't matter if it doesn't work, you still need it.
2. Go to your FH+ folder on your C-Drive. If you don't know where that is, go to your Libraries, and in the little list to the left it should say Computer. Click that, and there will be three files thing's. Go to the one that says 'Local Disk (C:)', then go to Program Files (x86), and then your FH+ file. It's either there, or back in your Local Disk (C:).
3. We'll start off easy by using the Oak Tree. Go to 'Media>Objects>Trees'. Find the three textures for the Oak Tree, and the Material File. Copy them, and go back to your C-Drive. Go to the FH file, and go to 'Media>Objects>Trees. Paste them, and click yes on any replacing pop up that comes up.
4. Open FH, and go to your 'Tools>Object Maker'. Go to your 'MyTrees' is the little list, and open the OakTree. Now it should be moving, AND should look more realistic!
It's very easy to do, and if you have any problems, let me know in the comments! It should work for the FirTree, and the Acacia Tree as well. I really hope this helped y'all, just let me know if you have any difficulties, and/or need help! Remember.. STAY BEAUTIFUL!;D<3
-Osi