Silverstring Media and indie.io have announced a mid-May release date for relaxing, semi-idle garden game Greenhearth Necromancer. You play as Echo, an enby witch and a newly graduated Actual Necromancer; she recently inherited her grandmother’s apartment. As the newbie at the Greenhearth co-op, you will have to revive a dead garden and find your place in the community. Greenhearth Necromancer will be launching for PC and Mac.…