Ever-changing Grove

You create a magical Grove of lush vegetation that erupts from the earth beneath your feet. While you are on the ground, the ground within 15 feet of you shapes itself to your will for the duration. As part of casting this spell, and at the start of each of y9ur subsequent turns, choose one of the following effects to happen within the Grove. The Grove can only have one effect at a time. 

-Thick overgrowth: A hostile creature moving thru the area must spend 3 feet of movement for every 1 foot it moves.

-Nature's Fury: When a creature enters the spells area for the first time on a tur  or starts its turn there, they must succeed a dexterity saving throw or take 2d6 bludgeoning damage, as various branches and stones attack them. On a successful save a creature takes half as much damage.

-Tripping Roots: Powerful roots attempt to trip your foes. When a creature enters the spells area for the first time on a turn or starts there, they must succeed on a strength  saving throw or be knocked prone.

At higher levels: When you cast this spell using a spell slot of 3rd level or higher, the radius of the spell increases by 5 feet for every slot level above the 2nd.