Dense trees with stately good looks and moderate growth rate. All have irregularly heart-shaped leaves and small, fragrant, yellowish-white flowers in drooping clusters in late spring, early summer. Flowers develop into nutlets, each with an attached papery bract. In cold-winter areas, fall color varies from negligible to good yellow.
Best in deep, rich, moist soil. Young trees need shaping, older ones only corrective pruning. Aphids can cause honeydew, which drips disagreeably and encourages sooty mold.
From Europe. Dense pyramid to 30–50 ft. tall and 15–30 ft. wide. Leaves are 1/2–3 in. long and as wide (or wider), dark green above, silvery beneath. Excellent lawn or street tree. Given room to develop its crown, it can be a fine patio shade tree (but expect bees in flowering season). Can be sheared into hedges. Very tolerant of city conditions.
From the Pyrenees. Forms wide, 8–12-in.-tall mats composed of 1–1 1/2-in., soft gray-green...
From the Mediterranean and western Asia. Grows to 2–3 ft. high and wide, with downy, heart-shape...
Native from Vermont to Alabama, west to North Dakota, Wyoming, and New Mexico. This stout-stemmed plan...