You can make your own tea, for example, by drying magnolia petals in the sun or in a food dehydrator.
Details
Pick the flower leafs once they’ve finished blooming and dry them with enough space between the petals. Once they’re dry, you can brew them into tea (in a tea infuser or loose in the pot), either on their own or mixed with regular tea.
Care tips
Make sure you use the right variety, from a clean (pesticide-free) environment.