Troubleshooting
Saucer Magnolia problems — and how to fix them
Saucer Magnolia (Magnolia × soulangeana) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Frost-damaged blooms
Early flowers turn brown and mushy when hit by late spring frost. Plant in a sheltered spot away from frost pockets, or choose a later-flowering magnolia to reduce losses.
Chlorosis on alkaline soil
Yellowing leaves with green veins indicate iron deficiency on chalky ground. Acidify with ericaceous compost or chelated iron and mulch with leaf mould.
Scale insects
Magnolia scale and other soft scales coat stems and excrete honeydew and sooty mould. Treat with horticultural oil in dormancy and prune out heavily infested wood.
Transplant shock
The fleshy roots resent disturbance, so moved or newly planted trees may sulk. Plant in spring, keep well watered, and avoid digging around established roots.
Prevent saucer magnolia problems before they start
Most saucer magnolia issues are care-mismatch, not bad luck. Dial in the basics:
Looking for saucer magnolia in general rather than its problems? Read the full saucer magnolia care guide — light, water, soil and feeding.
Saucer Magnolia problems — FAQ
Why is my saucer magnolia frost-damaged blooms?
Early flowers turn brown and mushy when hit by late spring frost. Plant in a sheltered spot away from frost pockets, or choose a later-flowering magnolia to reduce losses.
Why is my saucer magnolia chlorosis on alkaline soil?
Yellowing leaves with green veins indicate iron deficiency on chalky ground. Acidify with ericaceous compost or chelated iron and mulch with leaf mould.
Why is my saucer magnolia scale insects?
Magnolia scale and other soft scales coat stems and excrete honeydew and sooty mould. Treat with horticultural oil in dormancy and prune out heavily infested wood.
Why is my saucer magnolia transplant shock?
The fleshy roots resent disturbance, so moved or newly planted trees may sulk. Plant in spring, keep well watered, and avoid digging around established roots.