Tilia americana, also called American basswood, is the only linden native to the Western Hemisphere and one of the largest deciduous trees of eastern North America, regularly reaching 60–80 ft in cultivation. Its broad, dense canopy makes it a valued shade tree for parks, naturalistic plantings, and residential properties with sufficient room.
The tree establishes fastest in moist, deep, fertile soils with a pH of 6.0–7.5, performing best in bottomland or river-edge conditions, though it adapts to average garden soils with regular moisture. Consistent watering during the first two to three years speeds canopy development; mature specimens handle periodic drought. Mature trees produce root suckers at the trunk base that should be cut back to their point of origin to maintain single-trunk form; left unchecked, the tree gradually forms a multi-stem clump. Cold-hardy to zone 3a.
The flower clusters in early summer are a premier nectar source for honeybees; basswood honey is commercially harvested and distinctly flavored. Dried linden flowers, known as tilleul, are a traditional herbal tea used across Europe and North America for anxiety, insomnia, and feverish colds. Young leaves are edible raw. Indigenous peoples of eastern North America used the fibrous inner bark extensively for cordage, baskets, and woven mats.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.
Verticillium Wilt
Lower leaves yellow and wilt, often on one side of the plant, with brown streaking in the stem and crown tissue when cut open. Plants are stunted and decline over the season.
Remove and destroy affected plants. Avoid planting in soil that has grown infected tomatoes, peppers, or other susceptible crops. Rotate beds and improve drainage; there is no cure once a plant is infected.
Fungal leaf spot
Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.
Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.
Sooty Mold (Scale-Associated)
Black, powdery or crusty coating on upper leaf surfaces and stems. Affected leaves may yellow and drop in severe cases. The mold grows on honeydew secreted by scale insects, mealybugs, or aphids feeding on the plant.
Control the underlying pest infestation first using horticultural oil or neem oil applied thoroughly to stems and leaf undersides. Once pest populations are reduced, sooty mold stops spreading and weathers away over time. Rinse foliage with a strong stream of water to dislodge existing mold deposits.