Utterly Mad

The Spriggans pull their ships ashore, and inject their ships with a liquid. The ships soon shrink into fist-sized seeds. They collect them, and journey to the eastern side of the island. When there, they plant the fist-sized seeds, and inject them with another liquid to grow homes and basic workshops. (Alchemy lab, barracks and weapon manufactory, farm.)
They then inspect the surroundings of the location, looking for wild fruit trees/plants to obtain cuttings from, to grow.
After the alchemy manufactory is done, start experimenting with local herbs and plants to create potions or poisons.
After the weapon manufactory is done, they start knapping some stone arrowheads, and start growing bows out of small seeds.