The Southern Magnolia in North Florida
Southern magnolia (Magnolia grandiflora) is one of the defining trees of the American South, and North Florida is prime magnolia country. Large specimens are common throughout Tallahassee and the region — 60-80 foot trees with 30-40 foot crown spreads, producing the large white flowers that appear throughout summer and into fall.
They're also misunderstood trees. The most common complaint from property owners with mature magnolias: the constant leaf drop, the shallow root system, and the understory that nothing will grow under.
Here's what to know about managing them well.
The Leaf Drop: Normal and Ongoing
Southern magnolia is technically evergreen — it keeps its leaves year-round — but it constantly exchanges them. Old leaves fall as new growth emerges, and this happens continuously rather than all at once in fall. In spring, the leaf drop often intensifies as the tree puts on new growth, which can look dramatic but is normal.
The large, leathery leaves are slow to decompose (the waxy coating resists breakdown) and accumulate if not managed. This is the main maintenance burden of a mature magnolia: the ongoing cleanup.
Practical approaches to magnolia leaf management:
Accept it as mulch: Leaves under the tree's canopy can be left in place as a natural mulch layer. They protect the shallow root system, retain moisture, and eliminate the need for continuous cleanup in that area. The understory bare-soil look is actually better replaced by a mulch ring anyway.
Mulch mowing: A mulching mower can shred fallen leaves into the lawn where they decompose more quickly. This eliminates raking and leaf disposal.
Remove at intervals: For property owners who want clean lawn under the tree, leaf blowers and raking at regular intervals keep the area manageable. Trying to keep up with leaves daily is not practical.
Don't blow them into beds or storm drains: Magnolia leaves in storm drains cause drainage problems. Keep them on the property.
The Shallow Root System
Magnolia roots are relatively shallow and wide-spreading. They grow close to the surface and are easily damaged by soil disturbance. A few implications:
Mowing damage: Lawn mowing over surface roots can wound them repeatedly, leading to decline. A maintained mulch ring around the base of the tree — extending to the drip line if practical — protects the roots from mowing equipment.
Construction sensitivity: Magnolias respond poorly to root zone disturbance. See our guide on protecting trees during construction for the general principles, which apply particularly to magnolias.
Nothing grows under them well: The combination of shade, surface roots, and leaf drop that inhibits competition creates a challenging environment for lawn grass and many other plants. This is ecological adaptation, not a problem to solve by more fertilizer or different grass seed. Work with it: accept mulch, plant species adapted to shade and root competition (ferns, camellia, azalea, cast iron plant), or maintain the space as mulched area.
What Magnolias Actually Need
A mature magnolia in appropriate conditions needs very little active maintenance:
Pruning: Magnolias typically need less pruning than most large trees. The natural form — dense, pyramidal to broadly spreading — is the desirable form. Pruning is needed for:
- Removing dead wood
- Clearing low branches for clearance
- Removing structurally problematic limbs
- Managing proximity to structures if the tree was planted too close
What to avoid: Heavy pruning of magnolias creates large wounds that close slowly and create opportunities for disease. Cuts should be made at branch unions, not in the middle of branches. Avoid removing more than about 20% of the live canopy at one time.
Fertilization: Established magnolias generally don't need routine fertilization. Yellowing foliage can indicate iron deficiency in alkaline soils — acidic fertilizer formulations or soil pH adjustment can help, but get a soil test before doing anything.
When to Call a Professional
Fungal conks at the base: Indicates internal decay. A professional assessment can evaluate structural integrity.
Large dead limbs in the crown: Magnolias develop dead wood as part of their normal growth cycle, but large dead branches over occupied areas need removal.
Crown thinning: For trees over structures or in tight spaces, a professional can thin the crown to reduce weight and wind resistance without compromising the tree's structure.
Proximity to structures: Magnolias planted too close to houses create ongoing issues with roots, gutter debris, and branch proximity to roofs. If your magnolia is outgrowing its space, a consultation about options is worth having before the situation becomes urgent.
Questions about magnolia care in Tallahassee? Call (850) 570-4074 or request a consultation online.