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136


AEONIUM


A


tips of mature leaves take on salmon tones. Pale green to white fl owers. A. ‘Cyclops’. Resembles A.


arboreum ‘Zwartkop’, but leaves are deep red rather than black, and each rosette has a green center, or eye. Plants grow 4– 5 ft. tall and 3–4 ft. wide, with an open, branching habit. A. decorum. Bushy,


rounded, many-branched plant to 1 ft. high and at least as wide. Each branch ends in a 2-in. rosette. Fleshy, pale green, reddish-tinted leaves have red edges. A neat, compact grower with pink fl owers. A. haworthii. Free branch- ing and shrubby, plants reach 2 ft. tall and 4 ft. wide. Rosettes of blue-green, red-edged leaves are 2–3 in. wide. Cream-colored fl owers. Very tough, long-lasting plant that can take more cold than most. A. ‘Kiwi’ (A. decorum


‘Kiwi’). This popular, colorful plant forms a low, tight mound to about 11⁄2–21⁄2 ft. tall and 2 ft. wide. Leaves are tricol- ored: light green with pale yel- low variegation and bright red edges. Pale yellow fl owers. A. nobile. To 2 ft. tall and


nearly as wide. An unbranched stem holds a rosette of thick, fl eshy green leaves, often tinted reddish with maturity. After sev- eral years, rosettes produce a large (to 1 ft. high and wide), fl at-topped cluster of red fl owers on a thick red stem. The plant dies after bloom but produces many seedlings. A. ‘Sunburst’. Showy plant with 12-in.-wide rosettes of green leaves variegated in light yellow or creamy white and edged with red. Usually grows 11⁄2–2 ft. high and wide but can mound up to 4 ft. high. Flowers are cream-colored. Does not respond well to pruning. ‘Star- burst’ is similar, but with less yellow in the leaves. A. tabuliforme. Unusual species with unbranched stems holds single, nearly fl at rosettes just 2–6 in. high and 10–18 in. across; sometimes called dinner plate. Light green, hairy- edged leaves radiate from the center in perfect symmetry. After several years, a single, 1–2-ft.-tall stalk of yellow fl owers rises from the center. Plants die after fl owering.


A. undulatum. Bright apple green leaves are wavy, forming unusual-looking rosettes 10– 15 in. wide. Stalks are thick and up to 3–4 ft. tall; makes offsets freely. Yellow fl owers. A. urbicum. “Dinner plate” rosettes reach 8–15 in. wide. Long, narrow, gray-green leaves, loosely arranged, have reddish edges. Forms stems several feet tall, unbranched except for offsets at the base. Does not respond well to pruning. White or pinkish fl owers.


CARE


Plant in well-drained soil; cut back on irrigation in summer. With age, most aeoniums grow leggy. To encourage branching, cut back branches several inches below rosettes anytime except during summer dor- mancy. Rosettes tend to be smaller after growing out from pruning. Cuttings are easily rooted: let dry for a few days, then plant in sandy soil kept barely moist until new growth appears.


Aesculus HORSECHESTNUT, BUCKEYE


Sapindaceae DECIDUOUS TREES OR SHRUBS


ZZONES VARY BY SPECIES FFULL SUN O REGULAR WATER, EXCEPT AS NOTED


X SEEDS OF ALL ARE SLIGHTLY TOXIC IF INGESTED


b


ATTRACT HUMMINGBIRDS, BUTTERFLIES


Splendor’. Tree. Zones A2, A3; 1–9, 14–16. This attractive, cold-hardy hybrid grows to 35– 40 ft. tall and nearly as wide. Glossy, dark green leaves with fi ve (rarely seven) leafl ets turn brilliant maroon in autumn and are resistant to leaf scorch. Yellow fl owers, each with an orange-red blotch, are borne in clusters to 8 in. long. Best with some shade. A. californica. CALIFORNIA


fl owers appear at branch ends in long, dense clusters. In fall, leathery fruit capsules enclose glossy seeds. Prune estab- lished horsechestnuts only to eliminate dead or damaged wood and any awkward-looking branches. A. × arnoldiana ‘Autumn


BUCKEYE. Shrub or tree. Zones 3–10, 14–24. Native to dry slopes and canyons below 4,000-ft. elevation in Coast Ranges and Sierra Nevada foot- hills. This graceful plant grows 10–20 ft. or taller and spreads 30 ft. or wider, often with multi- ple trunks. The new foliage is pale apple green; mature leaves have fi ve to seven rich green leafl ets. California buckeye is striking in spring, when fragrant, cream-colored fl ower plumes make it look like a giant candela- bra. (Unfortunately, the pollen and nectar of this species are poisonous to honeybees.) Big pear-shaped fruits split to reveal shiny brown seeds favored for dried fl ower arrangements. Seeds sprout freely; seedlings make unusual bonsai subjects. In the wild, this plant drops


Aesculus californica


These big, bold plants have an almost tropical look. The leaves are divided like fans into large, toothed leafl ets. Showy spring


its leaves by July, but if given moderate water, it will hold them until fall. After leaf drop, the silvery trunk, branches, and branchlets create an interesting silhouette. A. × carnea. RED HORSE- CHESTNUT. Tree. Zones 1–10, 12, 14–17. Hybrid between A. hippocastanum and A. pavia. Grows to 40 ft. high and 30 ft. wide—smaller than A. hippocas- tanum and a better fi t for small gardens. The tree is round headed, with large dark green leaves, each divided into fi ve leafl ets; a mature tree casts dense shade. Flowers with a profusion of 8-in.-long plumes of soft pink to red fl owers. ‘Briotii’ has rosy crimson blos- soms, ‘Fort McNair’ has pink


fl owers with yellow throats, and ‘O’Neill Red’ has single fl owers of bright red. A. hippocastanum. COM- MON HORSECHESTNUT. Tree. Zones 1–10, 12, 14–17. This European native grows to 60 ft. high with a 40-ft. spread— a bulky, densely foliaged plant that casts heavy shade. Its invasive roots can break up paved surfaces. Leaves are divided into fi ve to seven toothed leafl ets. The fl ower show is spectacular: ivory blooms with pink markings are borne in 1-ft.-tall plumes. ‘Baumannii’ has double fl owers and sets no seed. A. pavia. RED BUCKEYE.


Shrub or tree. Zones 2–9, 14–24. Native to eastern U.S. This bulky tree grows 12–20 ft. tall, with an irregular rounded crown that is nearly as wide. Glossy deep green leaves with fi ve to seven leafl ets. Flowers in narrow, erect clusters are bright red or orange-red (rarely yellow). The best buckeye for humid climates.


Aethionema STONECRESS


Brassicaceae PERENNIALS


ZZONES 1–9, 14–21 FFULL SUN NDLITTLE TO MODERATE WATER


Aethionema


Native to the Mediterranean region and Asia Minor. These shrub lets, attractive in or out of bloom, are best adapted to colder climates and are favor- ites among rock gardeners. They grow best in a light, porous soil with considerable lime. Bloom comes in late


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