After being picked up, planting a seed will cause the player's Weapon to fire a powerful blast the next time it is used. The more seeds planted before firing, the greater the size and damage of the blast, up to a maximum of 600 damage at 20 seeds. Once this is fired, the counter is reset: the player's weapon will return to normal until they have planted more seeds.
The damage dealt is not affected by the player's Fighting Stat or Weapon, only by the number of seeds planted. All kinds of seeds increase the blast damage by the same amount, including tree saplings. Seeds planted by using an Anemochory Scroll also count towards the total.
(Values marked with an asterisk are estimations)
The following is a list of possible Items that can affect Sprout Energy: