Just wondering if anyone had a quick method to do free standing leaf trees for me to add into some landscaping for a building cake I am doing.
Any advice would be great!

Make green rice crispy treats. I've seen it used for wreaths, garland and trees.

I made a large tree this way but you can do smaller ones as well.
I also had to really compact the treats so they did'nt fall ff because the tree was so big but for smaller ones you can leave the treats a little more loose.

Make the trunk out of a wooden skewer and gumpaste and add some rice crispies on top. They look just like leaves.
Just add green coloring to the melted marshmallows .
HTH.

I recently did a landscape cake (in my photos). I know you don't want pine trees. I used fondant with tylose mixed in to help stabilize the fondant. Maybe you could try that.

Use wooden dowel and floral wire to help make a support and then cover with fondant.
or if you don't need a 3D tree, you can do 2D by doing cut outs from gum paste or chocolate and making a base for them to be attached to and stand up.
HTH

I've done pine trees in my last cake and you can use the same technique to make your type of tree. I just melted fondant and mixed in the RKT. You can also use white chocolate and RKT.