Magnolia trees are slow to moderate growing evergreen trees, ranging from 60 to 80 feet high, but in the desert Southwest they are more likely to be only around 30 feet high.
They prefer partial sun, but do quite well in protected areas with full sun.
The Magnolia grandiflora is very ornamental and produces huge, white, fragrant flowers, "Goliath" has flowers up to 12 inches across. Great as a specimen tree.
The tree requires regular watering or leaf drop will occur.
The Magnolia tree doesn't have any mentionable issues with insects or diseases, but it does tend to be a messy tree. It is an evergreen, so it keeps it's leaves through-out the winter, but come spring-time, they drop their huge leaves for about a month or more.
This creates huge masses of leaves on the ground and if you happen to have a swimming pool nearby, the filter will be filled very quickly.
The Magnolia tree grown in the desert Southwest can be kept fairly small and grows slow enough that it would do well as a patio tree or in small landscapes.