From their announcement:
Our Woods Plates are done and up in our web store. There are four highly detailed stands, each designed to hold Woodland Scenics Ready Made Trees or trees of your choice. These pieces come individually or as a set, with or without trees. Instructions can be found on our website including guidelines on how to get the most from your Woodland Scenic trees.
These are designed as small clumps of trees for 28mm figures. A set can be readily used to determine the boundaries of a forest or wood. We also find them useful individually scattered about the table top. Prices range from $7 to $50US.