Is there such an option using a brush or do you have to place one by one
Hi, you can use brush to paint plants on a vertical surface, or use the scatter tool as well.
In 2.4, the scatter tool will work better on vertical surfaces.
Thanks Oliver. But I meant that I wouldn’t have to place the plants one by one like in the tutorial you sent, but use a brush.
I found the solution: check align to terrain
By the way, when is 2.4 coming out?
Hi, it will come out next week. 
We are upgrading the server trying to make it more stable.