A Nintendo Switch/PC/Ps4/XBox remake of the 2003 Gameboy Advance games HM: Friends of Mineral Town and HM: More Friends of Mineral Town. [ Game Guide ] JP release = Oct 2019. NA release = Jul 2020. EU release = Jul 2020.
Unlike the other harvest moon games, it doesn’t grow in the same spot per say. Instead, every night, the adjacent squares of a grass tile have a 25% chance to grow grass (according to reddit). If you just harvest the nessecary grass for your animals every day and mostly leave it alone, it should spread quickly.