Tiptoe forward until the plant attacks, then move a bit closer, so your weapon swing will intersect the path of the plant's appendage. Low Goblins can be pesky even when delimbed. These hopping creatures come in both large and small varieties and are not afraid to attack even if they are unarmed. Common to all lands in Rune, goblins will often help you attack whatever indigenous creatures inhabit the area, especially snow beasts and dark Vikings. Small goblins are usually armed with a bone club, if they're armed at all.
Larger goblins carry axes that do more damage.
All goblins satisfy themselves with single-swing attacks, exhibiting no cleverness whatsoever.