I'm known for always overdoing it, so I've done 20.
One of the complaints people make in the game is that the basing for scenry is so thick the models teter and fall over if the are half way on a terrain piece. So I used Hexs from Kallistra they are 2mm wide made from plastic, I've had no issues glueing terrain on. The weight of the trees will make a triple Hex bend ifyou hold it at one end, but so would a 12"/30cm ruler if you put a lead weight at one end.
Basing material sorted I then chose the trees, these I bought in 2008/9 for the demo game Hands up! that i took to shows. They've been in and out of boxes and still look good, sure they shed but keep then in the samebox and glue what drops off abck on, I've done this once in 14 years. The trees are from K&M
Trees however you can get them from Kallistra too.Note the length of metal below the provided trunk, cut it off at the length you want, vary it and alter the height of the tree, then using super glu screw the metal trunk into the base.
Both companies provide bases into which you can insert the trees, I prefer the metal pewter one (added weight).
Now use plastic filler caulk, whatever to sculpt the trunk don't be tidy be messy, start with the provided trunk widening it, cover the twisted wire and finish off over th ebase as shown.
I use a pointed palette knife, wet it to stop it sticking.
When dry I painted with varying shades of brown, from Burnt Umber to a lighter shade. Later when basing I finished off with a light dry brush of Iraqi Sand.
Once painted I glued the tree to the hex, if doing a triple hex remember to position them to allow foot soldiers through or tight to stop them.
When that was dry another coat of my mix, to fix the sand.
When that dries I paint with XV-88 then dry brush with Iraqi sand.
I prefer not to cover the whole base with flock I flocked about 50% using static grass and then added flower clumps.
The other advantage of hexs is that you can push them together to get larger woods.