Budding Growth

Numerous tall, thin, budding vines sprout straight up from the ground in a 20-foot square starting from a point within range.
The buds in these vines instantaneously flower and release thin, irritant, dandelion-like flying seeds that obscure the air. For the duration, these plants turn the ground in the area into difficult terrain. When the spell ends, the plants wilt away and the seeds disperse harmlessly.
While the spell is in effect, the seeds make the air highly flammable. Any fire attack, spell or fiery object thrown at or passing through the area would cause all the plants to instantly catch fire, dealing 1d6 fire damage to all creatures within the area. A creature can make a Dexterity saving throw to avoid taking damage.
After this happens, the spell ends and the plants are burned to the ground leaving nothing but ashes behind.