This spell causes plants to wrap around and grapple foes in the area of effect or those that enter the area. Creatures that fail their save gain the entangled condition. Creatures that make their save can move as normal, but those that remain in the area must save again at the end of your turn. Creatures that move into the area must save immediately. Those that fail must end their movement and gain the entangled condition. Entangled creatures can attempt to break free as a move action, making a Strength or Escape Artist check. The DC for this check is equal to the DC of the spell. The entire area of effect is considered difficult terrain while the effect lasts.
does this cause plants to grapple:
foes in the area, and foes who enter the area,
- OR -
foes in the area, and any creature - friend or foe - who enters the area after the initial cast
Changing the word "those" to either "creatures" or "foes" would clarify. :-)
I'm pretty sure it's supposed to be any creatures in or entering the area of effect, not just foes initially.