- Bigleaf magnolia trees thrive in part shade or full sun. They do best in fertile, mildly acidic soil that drains well while retaining some moisture. Avoid planting the trees in a location that remains consistently wet, as this could lead to root rot and other diseases. Choose a site protected from high winds and incorporate organic compost with the garden soil before planting.
- A regular watering schedule is necessary throughout the first growing season to encourage a sturdy root system. Once the roots have begun to grow steadily, supplemental watering is only needed during dry spells. Spreading a layer of organic mulch over the soil beneath the tree reduces the need for frequent watering and prevents weed growth. Feed with controlled-release fertilizer only if foliage begins to die or growth slows significantly.
- Extensive pruning is not necessary for bigleaf magnolias. Since the trees do not grow quickly, pruning wounds are sometimes slow to heal and should be kept to a minimum. Prune during late summer, so that developing blooms aren't removed. Make clean cuts and remove entire limbs all the way back to the area where they join onto the trunk or a larger branch.
- Bigleaf magnolia trees are not easily killed, but are susceptible to a number of pests and diseases. Plant hoppers, thrips, weevils and even snails can become a nuisance if left unchecked. Anthracnose, powdery mildew, bacterial leaf spot and canker may also affect the tree. If you notice signs of a problem, such as leaf spots, yellowing, dead growth or lesions on the bark or branches, contact a local extension agent for help with diagnosis and area specific treatment suggestions.
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