A Technical Report from The Bartlett Tree Research Laboratories
Southern Magnolia (Magnolia grandiflora) is a magnificent slow to moderate growing, large size evergreen tree. It is well suited for use as a specimen tree or as part of a group planting screen. Its large glossy green leaves and showy white summer flowers make it a popular ornamental in warm climates.
Magnolia grows best in acidic (pH 5.0 to 6.0) well drained, loamy, moist, rich soils. They are tolerant of high soil moisture but cannot withstand prolonged inundation. Partial shade or full sun is ideal.
Trees should be mulched to the dripline to make watering and fertilization easier and to promote root growth. Letting branches grow to the ground allows for an accumulation of fallen leaves and branches to produce a natural mulch and reduce traffic which can compact the soil. The root collar must be kept free of mulch and soil to prevent disease.