First, be sure you live in a warm region. Champaca plant care starts with siting the tree in U.S. Department of Agriculture plant hardiness zones 10 through 11.
If you are buying a container plant, here’s what you need to know about caring for champaca trees. They will thrive in almost any soil and, while they prefer a location with morning sun, they tolerate shade.
Caring for champaca trees involves lots of water, initially. You’ll have to irrigate your plants regularly and generously until they are established. At that point, you can water them less.
Start growing champaca magnolias from seed by harvesting the fruit. Wait until the fruit ripens in fall, then remove some from the tree.
Put them in a dry place until they split open, revealing the seeds inside. Lightly sand down parts of the seeds with sandpaper and nick them with a knife.
Then soak them in hot water for 24 hours until they double in size. It will also make champaca plant care easier if you treat the seeds before planting with a fungicide. Plant the seeds, just barely covered, in acidic potting soil and spray to keep the soil constantly moist. Keep them covered with plastic wrap to increase humidity.
Keep them very warm (85 degrees F. or 29 degrees C.) until they germinate.