In New Horizons, Nature Day takes place from April 23rd to May 4th, featuring special Nook Miles+ rewards for nature-related activities (such as planting bushes), as well as more frequent visits from Leif, who sets up a stall in the Resident Services plaza.
After completing a Nature Day-specific Nook Miles+ task for the first time, the player can speak to Tom Nook in the Resident Services building to receive the Hedge DIY recipe.