Blossom Blade

You fling a sharpened flower petal toward a creature you can see within range, much like one would with a knife.

Make a ranged spell attack - on a hit, a creature takes 3d6 slashing damage, and the area within 15 ft. of the target becomes covered in thorny vines for the next minute, becoming Difficult Terrain. 

If the target casts the Shield spell, then the attack misses regardless.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 and the radius of the thorny vines increases by 5 ft. per level of spell slot above 2nd.