There's nothing quite as spectacular as a magnolia tree in full bloom. Different types of magnolia trees flower at different times of the year, but in May, your focus should be on fertilizing, deep watering, and mulching, alongside light pruning – although you'll need to be careful not to remove any new buds.
No matter whether you have an evergreen or deciduous magnolia tree, it will generally prefer rich, well-draining soil and bright light. Deciduous magnolias are the hardier option, while evergreen magnolias are generally larger.