Venus fly trap

A large Venus fly trap sprouts out of the ground.  Something has to make a DC 17 strength saving throw or be grappled as the Venus fly trap grabs it.  The virus fly trap does 15 acid damage every round. The Venus fly trap can move 50 feet per turn and can drop the person  it has to make a DC 13 dexterity saving throw or take 1d12  falling damage