You can use the Seal Seeds for the Formulas in guild base - farm area from Kidd sprite npc
You just have to buy the formulas.
After you buy the Formulas from Kidd (Sprite Npc), head up to the Alchemy sprite click "Alchemy in Progress" and drop in the formulas to receive a plant. You can then plant in your guild farm area and such.
Formulas such as the Maple Talent Card (Lv 61~72), Maple Reasonance Stone - Gives Reasonance Stone Formula or Mesozoic/Paleozoic Stones, Haunted Halloween - Gives Candies/Costumes/etc, Sweet lover - Gives costume and such
Each formula requires a specific amount of seal seeds*