I'll try to post a picture for comparison.
Mar 28, Possible Reasons. First of all, you need to rule out a nutrient deficiency in your soil. Yellow leaves on Southern magnolias can indicate that your soil has insufficient nitrogen. The only way to determine for sure whether or not this is the problem is to have a soil test done. If the test results do, in fact, show a nitrogen deficiency, you can fertilize accordingly to raise the nitrogen stumpdelimbing.clubted Reading Time: 3 mins.
This is my first spring in my first house, and one of my favorite things about the house was the large Southern Magnolia right in the backyard.
However, this seems to occur more often in the spring.
Well - the leaves have started turning yellow and falling off - significant loss of leaves. Also, there are brownish/black spots on the underneath of the leaves.
There is some new growth at the very ends of each of the limbs - but overall, the tree is looking very sick. Dec 10, If there has been a sudden frost, a heat wave or a prolonged period of drought, the magnolia leaves may be turning yellow due to weather damage. Though mature magnolias do.