Evil Seedling

From the introduction:

Evil Seedlings are the immature precursors to various alien plant-based Threats that have been sent to infiltrate or destroy Earth. Planted as seeds, many are able to grow at surprising speed due to the purple energy they feed on, sometimes maturing into fully grown plants in one day. With tentacle-like vines that can burrow and emerge from underground, they defend themselves from being weeded out by their enemies by using their force to deliver heavy blows and entangle those who get too close.