There are ten different tree types that you can toggle with the slider. Press the re-generate button to make a new tree. Since it's all completely random, keep in mind there may be some weird looking trees.
I've seen some of these around Scratch and I thought I'd give it a try. Don't worry though, the code is 100% me, promise. It may lag a bit but hopefully not much. It always gets the job done. Let me know in the comments which tree is your favorite!