According to the search results, the following bushes are in season in Animal Crossing: New Horizons:

• Azalea Bushes: Pink and white. They bloom from April to May in the Northern Hemisphere, and from October to November in the Southern Hemisphere.

• Camellia Bushes: Red and pink. They bloom from January to March in the Northern Hemisphere, and from June to September in the Southern Hemisphere.

• Hydrangea Bushes: They bloom from June to July in the Northern Hemisphere, and from December to January in the Southern Hemisphere.

• Hibiscus Bushes: They bloom from July to September in the Northern Hemisphere, and from January to March in the Southern Hemisphere.

• Tea Olive Bushes: They bloom from September to October in the Northern Hemisphere, and from March to April in the Southern Hemisphere.

• Holly Bushes: They bloom from December to January in the Northern Hemisphere, and from June to July in the Southern Hemisphere.

Its worth noting that bushes and shrubs are only sold by Leif, who appears in the town plaza during and after the Nature Day event, provided that the player has already helped Timmy build Nooks Cranny on their island.