You drain the vitality from the vegetation around you, with effects determined by the spell's casting time.

If you cast this spell using an action, all nonmagical plants' leaves, blossoms, vines, and similar within 1,000 feet shrivel up and drop to the ground. Ground that featured ample plant life becomes difficult terrain. Any area heavily obscured by plant life becomes either unobscured or lightly obscured, as appropriate.. You can exclude one or more areas of any size within the spell's area from being affected.

If you cast this spell over 24 hours, you completely drain the land of its life, turning it into a desolate wasteland. All nonmagical plants in a 1-mile radius shrivel, die, and turn to grey dust. No plant can grow in the area for 1 year. Further, harsh winds plague the area, and each creature with a Challenge Rating of 1 or lower has disadvantage on all saving throws while inside the area. For each hour a creature spends within the area, it must succeed on a Constitution saving throw against your spell save DC or gain 1 level of exhaustion.