I haven't actually posted these up for sale yet, but I just finished cobbling together a quick video to at least show an example of what they do, since still pictures wouldn't do them justice.
Here is the link to the video
http://www.youtube.com/watch?v=weG3VEsvclE
Please keep in mind, the growth shown in those videos is set to a high rate of speed, for demonstration, but the plants work even better (and use very little script time) when they are set to grow at slower rates (which also makes it seem slightly more realistic)
In essence, these are various plants that "germinate" in small size via a specialized rezzing unit. The plants then grow as en entire linkset.
The owner can set the rate of growth and the rate of spawn, via the rezzer's menu.
The rezzer can be hidden away or shown as desired, via the dialog menu.
The user can randomly rez plants/trees on demand, via the RezNow option, or the unit can be set to continuously germinate more plants at a rate set by the owner.
The rezzers are designed so that the plants can be purchased separately, and added to the units as you desire. This way you can mix and match selected plant types in an area.
The entire set may be purchased as a whole if desired.
Each rezzer will cover a circular area roughly 19m across.
If you are interested in these plants, look for them soon on XStreeSL or inworld in the Spell Caster region.
If you are a tree/plant maker interested in licensing this growing system for use in your own products, please contact Vladimir Petrichor inworld.