In 1/35th I would make my own. Collect twigs from the garden of a scale appearance off the ground and preferably dry. Dry them out in the airing cupboard for a few days and then add foliage from bags of Railway scenery lichen.
This makes a very realistic tree far better than any plastic purchased tree in a specific scale.
You can actually buy 1/35th leaves nowadays to decorate diorama's but you have to be very keen to start sticking them to twigs!!