What is the cause for a browning magnolia in Zone 5?
Answer
Dear Troy,
Although species of Magnolia are found throughout the United States, harsh winters and unseasonal cold spells can result in weather- and temperature-related damage, including broken stems and branches, wilting, blackening of leaves and stems, as well as browning flower buds. We experienced long lasting and severe cold here in this regions, and I expect that the same was true for your region. Here are some steps to take to overcome the winter damage:
1. If magnolia trees have been subjected to cold temperature conditions, wait until warmer spring weather to more accurately assess the damage. If the correct magnolia cultivar has been planted for the local climate, it is likely the freezing temperatures have caused only superficial problems.
2.Once temperatures warm, clear away dead leaves and flower blooms to examine stems and branches for deeper damage like frost cracks. Prune away any damaged or dead wood.
3.Apply a light fertilizer and mulch, which will help the tree recover and prevent frost from reaching the magnolia's roots in the future.
4. Small frost cracks rarely require treatment; larger ones, however, should be treated with fixed copper.
5. Check with your local Agriculture Extension Service for additional advice, extension.missouri.edu/directory/.
Good luck.