Liquidambar styraciflua
Sweetgum
Common names: American sweetgum
At a glance
- Light
- Full sun
- Hardiness
- Hardy
- Pruning
- Jan–Feb
Photo: Jean-Pol GRANDMONT · CC BY 3.0 · Source
Description
The Liquidambar, botanically Liquidambar styraciflua, is distinguished by its maple‑like, five‑to‑seven‑lobed leaves that can be mistaken for maple. Its true show comes in autumn, when the crown displays a spectrum from yellow through orange to deep red and violet, a color display hard to beat in a garden. As a medium‑to‑large tree it needs space from the start, as it grows tall and develops a slender, conical crown. The corky, furrowed bark and spiky, globular fruit clusters give it structure even in winter, making it a year‑round focal point.
Care instructions
Plant the Liquidambar in a sunny to partially shaded spot with deep, slightly acidic to neutral soil; it tends to develop chlorosis from iron deficiency on calcareous, very dry soils. Keep the root zone evenly moist in the first years after planting, especially during dry summer weeks from June onward. Pruning is rarely necessary; remove only dead or crossing branches in late winter to preserve the natural crown shape. A mulch layer of leaf litter or bark humus around the trunk retains soil moisture and suppresses competing vegetation. Because the roots can spread shallowly, plant it away from paths and utilities, preferably in the fall after week 40 when the soil is still warm.
The care notes were machine-translated from German.
Soil & site
Soil pH
Soil type
well-drained, loamy, moist, nutrient-rich, lime-avoiding
The sweetgum likes deep, evenly moist soil without waterlogging. It is happiest on slightly to moderately acidic ground and quickly reacts to lime-rich, compacted soils with chlorosis. A spot with humus-rich, loose soil and a sheltered microclimate pays off particularly well with this species.
Feeding
Medium feeder
Months
Mar, May
Treat the sweetgum in spring to a dose of compost around the root area; that is usually enough for the whole season. A mulch layer of leaves or bark humus keeps the moisture in and incidentally supplies nutrients. You can easily do without extra feeding in summer; otherwise it drives too much soft growth, which frost punishes badly.
Pruning
The sweetgum naturally forms a beautiful, even crown and so needs hardly any intervention. Prune only lightly in its youth to encourage a stable leader structure, best in late winter before the sap rises. The species tolerates larger pruning cuts poorly; it reacts with wound rot and slow callusing.
Overwintering
Young sweetgums thank you for winter protection of mulch or leaves over the root zone, especially in the first years after planting. A sunny, wind-sheltered site helps to avoid frost cracks in the still thin bark. Older, established trees are hardy in most parts of Germany and no longer need any special protection.
Propagation
Methods
- From seed
- Cuttings
- Layering
- Grafting
Propagation by seed is the classic way, but needs several weeks of cold stratification and a lot of patience until the first shoots appear. Semi-ripe cuttings in summer root only with some luck and a damp, warm environment. Layering suits low-hanging branches close to the ground well. If you want to secure a particular autumn colour, turn to grafting onto rootstocks of the species.
For your garden
Grow Sweetgum yourself
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