Feedback on Vine Arrow

I am playing with Vine Arrow to try out the Overgrwoth interaction. With the limit increase in the patch ("Now gains +1 to Limit of Plants at Gem levels 12 and 19.") I was expecting this to be another scaling axis for damage (especially single target), however this is not the case, an enemy can only be affected by a single vine. It would be great if the DoT part of the vines would be stackable, or at least mention this limitation in the skill description. Thanks.