Looking at this picture, I see a circle with 4 stems at the lowest point, and then you have added another 'circle' above it.
I am assuming that the original big 'bush' is made up of lots of these smaller pieces, and so you can make these as tall as you like.
Are cocktail sticks the best thickness to match the holes, or are there different sizes of foliage? It is possible to get some plant supports stained in a dark green colour that would be a natural for this, as long as they weren't too thick.
This is a great tip Bish.
I would be tempted to add all your planned terrain tips and projects into one thread, and if necessary I could sticky it as it grows.
Ideally we want to revive the Workshop as it was intended as a home for this sort of thing.
The theory is that articles start off as threads in an appropriate main board and then they are turned into finished articles in the Workshop, Library or War Room.