Hit: "1d6 fire damage, and the squares adjacent to the target become a fiery zone that lasts until the end of your next turn. Any enemy that enters the zone or starts its turn there takes fire damage equal to your Wisdom modifier. [U:12/2011]
"Level 21: 2d6 fire damage."[PH2:85]
Flame seed is an at-will power available to druids at 1st level.