|Liquidambar / Sweet Gum||(Liquidambar sp.)||C,S %|
| can be used instead of Japanese Maple; prefers a neutral or slightly acid soil mix; remove all large terminal buds from the branches in the spring to encourage side buds; repot less often; can throw occasional large/disproportioned leaves; give as much sun as possible to set up good autumn coloring; you don’t have to leaf prune this plant. [Hamamelidaceae; Saxifragales]
General Information: Sweetgum grows naturally in a narrow pyramid. It has glossy, star-shaped leaves which turn bright red, purple, yellow or orange in the fall/early winter. The trunk is normally straight and does not divide into multiple trunks. The bark becomes deeply ridged. It is native to North America.
Lighting: Will grow in full sun or partial shade.
Temperature: Zones 5B – 10A. More restricted zones may apply to some of the dwarf varieties.
Watering: It is moderately drought tolerant.
Fertilizing: To retain and produce small leaves, do not feed high nitrogen fast-acting fertilizers. Feeding three times a year is sufficient to maintain good color and healthy growth without enlarging the size of the leaves.
Pruning and wiring: Much shaping can be done by pruning.
Propagation: Cuttings, seeds.
Repotting: They transplant well. Any type of soil with a pH of 7 or less, and with good drainage seems to grow them well. They have heavy root growth so must have root room.
Pests and diseases: Bagworm, fall webworm, leaf miner, cottony-cushion scale, sweetgum scale, walnut scale, and tent caterpillars. Diseases include canker and leaf spots.
Compiled by Thomas L. Zane