In this league, you will find caches of seeds in each zone. You can take these to Oshabi’s Sacred Grove to plant them. With time these plants will fully mature and they can be harvested by killing the monsters emerging out of them for their Lifeforce. Once the harvest is complete, the plants will provide special crafting options in exchange for Lifeforce. Higher tier seeds will need other seeds and extra Lifeforce in order to grow, which will require plotting your grove to maximize your bounty.