Boost fertilizer I

 is produced at the church workbench by combining the basic fertilizer peat with an energy elixir, the latter requiring an introduction to alchemy. Like all fertilizers, a single unit may be applied to a single farming plot - either an empty garden bed, garden bed with sticks, or vine trellis - in order to provide a benefit to the subsequently planted crop.

The benefit of a "Boost" fertilizer - note the hourglass icon - is an overall improvement to a crop's growth-rate. In regards to specifically, the given crop will grow 40% faster, reducing the 24 minute maturation of most crops down to ~15 minutes, or 2 in-game days. For additional information regarding the effects and use of fertilizer, see farming.

Study
Dünger verbessern I Engrais Enrichi I