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ISCHYROLEPIS


Ischyrolepis


subverticillata BROOM RESTIO


Restionaceae PERENNIAL


ZZONES 14–24 FP FULL SUN OR PARTIAL SHADE DMODERATE WATER


Isolepis cernua (Scirpus cernuus)


FIBER OPTICS PLANT


Cyperaceae PERENNIAL


ZZONES 7–24 P PARTIAL SHADE WAMPLE WATER


Itea SWEETSPIRE


Iteaceae


EVERGREEN, SEMIEVERGREEN, AND DECIDUOUS SHRUBS


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


winter. Fragrant, creamy white summer fl owers open in erect clusters to 6 in. long. Compact varieties include ‘Henry’s Gar- net’, 3–4 ft., a superior (maybe the best) selection with brilliant purplish red fall foliage; ‘Mer- lot’, 3 ft., with rich red fall foli- age; ‘Scarlet Beauty’ (‘Morton’) grows 3–4 ft., with orange-red fall foliage; and the charming 2-ft.-high ‘Little Henry’. All are good in woodland gardens.


Ixia AFRICAN CORN LILY


Iridaceae PERENNIALS FROM CORMS


ZZONES 7–9, 12–24; OR DIG AND STORE


I Ischyrolepis subverticillata


Resembling a big, clumping horsetail (Equisetum hyemale), this reedlike South African plant can reach 8 ft. tall and 4 ft. wide. Erect or slightly arching, canelike stems hold whorls of long, thin leaves at evenly spaced nodes. Insignifi cant fl owers appear at branch tips in late summer; small, silvery, showy seed heads follow on female plants. Remove outer stems every 2 or 3 years to rejuvenate plant. Good in large pots. Stems are excellent in cut-fl ower arrangements.


Ismene calathina. See Hymenocallis narcissifl ora


Isolepis cernua


A 6–10-in. bundle of tiny green fi ber optic cables would make an uncanny likeness of this sedge. Native from the British Isles to North Africa, it eventu- ally becomes about twice as wide as high. Small brown fl ower spikelets appear all year at the ends of the drooping, threadlike green stems. Occa- sional division will keep it small. An ideal plant for the edge of a shallow pond, it also makes a good container plant, especially when placed where you can see its blooms.


Isotoma fl uviatilis. See Pratia pedunculata


Itea virginica


Itea’s Greek root means “wil- low,” probably for the graceful catkin-like fl ower clusters that hang from some kinds. Individ- ual blooms are small and fra- grant. Little pruning required. I. ilicifolia. HOLLYLEAF SWEETSPIRE. Evergreen. Zones 4–9, 14–24. Native to China. Shrub has graceful, arching, open habit to 15 ft. tall, 10 ft. wide. Leaves are oval, spiny- toothed, to 4 in. long; new foli- age is bronzy red, matures to glossy dark green. Lightly fra- grant, greenish white fl owers hang in clusters to 14 in. long in autumn; blooms sparsely where winters are mild. Not striking, but a graceful plant of distinction. Needs partial shade in hottest climates. I. japonica ‘Beppu’. Semi-


Contained Exuberance


Grasslike plants are especially striking in containers. Try big, upright growers such as broom restio in a large urn-shaped pot for an accent, or place two as sentinels beside a path or driveway. True grasses like Calamagrostis and Panicum give the same effect. Fiber optics plant (as well as some fescues and


Carex species) has a mounded shape that looks cool- ing—like a fountain of green—in a low bowl.


evergreen. Zones 4–6. Col- lected in Japan, but possibly from an imported I. virginica, which it resembles in most respects—and may turn out to be. Grows 21⁄2 ft. high and suck- ers widely. Reddish purple fall foliage is its best feature. I. virginica. Deciduous. Zones 2b–6, 15–17. Native to eastern U.S. Grows 3–15 ft. tall, spreading by suckers to form large patches where well adapted. Narrow, oval, 4-in.- long, dark green leaves turn purplish or bright red in fall, hang on the plant well into


FFULL SUN


O REGULAR WATER DURING GROWTH AND BLOOM


Ixia


Spikes of up to 20 brightly colored fl owers per stem rise above Ixia’s grasslike leaves in late spring. Each six-petaled blossom opens nearly fl at in full sun but remains cupped or closed on overcast days. Colors include cream, yellow, red, orange, and pink, typically with dark centers. Stems are 18– 20 in. high. Most ixias sold are hybrids of the South African I. maculata.


CARE


Grow in well-drained soil. Where winter lows usually stay above 20°F (–7°C), plant corms in early fall, 2 in. deep and about 3 in. apart. Where temperatures may drop to 10°F (–12°C), plant in late fall, setting corms 4 in. deep; cover planting with mulch. In colder areas, plant in spring for early summer fl owers. Let


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