Back to your trees B17. You can try using the stalks from bunches of grapes. Cut them to length needed, varnish to prevent decay. Paint as required, then add foliage.Sort of works for small trees up to 1/48th scale but not brilliant. However, in all scales up to 1/24th., the only sure way of getting a scale height and span is to make your own. It is a long drawn out method, takes time, but the results are worth it! Get some copper wire, for example stripped from three or multi-core electrical cable, cut to lengths LONGER than height of tree, and twist a number of strands together, like a rigid 'rope'. Splay out the tops to make boughs and branches to suit, coat 'trunk' in filler or modelling putty and, when dry, paint in greys with a dry-brush of browns. (NEVER straight brown!) Add foliage etc., 'plant' base of trunk into hole drilled in baseboard. Voila!One tree! Note, it helps to wrap the wire trunk and boughs in masking tape before coating in filler or putty. Using this method, you can make any scale tree, type of tree etc., and they will LOOK like trees, far better than plastic 'toy' trees!