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Pinus wallichiana

Himalayan or Bhutan Pine

Ail elegant pine, considered by some the most beautiful pino haWf is broad-pyramidal in youth and old age. Ihe S- to tMn,-long. bW« 1 Heed/ei <xcur in bundles of five and often anh gracefully over their length providing hne-textured appearance. Move as j young plant Into rtiuist. acid, weJI-dralned soliy and provide shelter Irom desiccating winds. Only use should be as a specimen. tirows 30 to 50 ft, high, generally equal in spread. Zones s to 7 Himalayas,

( iittivars and Varieties. 'Zebrinus' is similar to Pinus daaifiora 'Ocuiuvdracont*; although the bands on the needles of (his Himalayan Pine cultivar tend to be more cream colored.

Pmui woltKhtana, Himalayan Pirw

iqnteci mater

Plata ñus xacerifolia

London Planetree

London Planetree got lts name from extensive use in the city of London, where it is one of the few survivors oí the coal-polluted air. No other shade tree has been more widely planted in cities worldwide than Pta tanas xúcerífbtia (a hybrid of orientals x P. incidental is), It is a massive tree with wide spreading branches, a fact belied by its tight-pyramidal youthful outline. The cream- to olive-colored bark is one of the winter landscapes bright beacons, The dark green leaves, ft to 7 In. long and H to 10 in. wide, turn yellow-brown In autumn. I have not seen a soli condition that this tree will not tolerate—wet, dry, acid, and alkaline are all acceptable, Anthracnose kills young leaves, especially in moist weather. Stems also die back as a result of anthracnose, resulting in a "brooming" effect. Piatanus xaceri folia is certainly more resistant than P. occidentalst however. Use for street plantings, commercial sites, campuses, goli courses, or any large area. En finest form, it is a beautiful and imposing specimen tree. Grows 70 to KM) ft, high, 65 to »0 ft. wide. Zones 4 to 8(9).

Cultivors and Varieties. Several ant hracnose-resi slant cultivan are available, including 'Bloodgood; which is one oí the most common in commerce, 'Columbia' 'Liberty', and 'Yarwiiod'.

Pfatanui - acertloifa bafV

Platanus xacerifotia, London Planetree

ftalonus Kocentotm creating an cleqant altee jr t^e jardín des Plantes, Pans

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Polygonum aubertii

Silver-Vine Ftreceflower

I his plant has never ranked In the top 2S vine list, but it keeps surfacing in nursery catalogs as a fast, easy-to-grow cover. It will grow 10 to LS ft, in a single season. The I '/:■ to i'/a-in.-long, bright green leaves die off green in fall, f rom July and August into September, fragrant, whitish flowers blanket the foliage in a sea of foam. Will grow in virtually any soil, in sun or shade, Utilize for a quick cosTer K1owt-ers when few other plants offer color, Grows 25 to ft. high. Zones 4 to 8, Western China.

Poncirus trifoliata


! have observed this sped« used artistically in the Mediterranean garden at [on g wood Gardens in Kennett Square, Pennsylvania, and in the collections of the Arnold Arboretum in Boston, Massachusetts. The primary shortcoming of this plant is the 1- to 2-in.-long, stout spines, which are quite sharp, almost lethal* The rich glossy green, trifoliate leaves turn a reasonable yellow in fall. White, live-petaJed flowers, IVi to 2 in- in diameter, appear In April and May and are followed by 1 '/i-in.-dlameter, rounded, yellowish fruit that ripen in September and tkiober. lhe green stems are attractive in the winter months. Kxtremely adaptable, this species prospers in any well-drained soil. Displays excellent drought tolerance. Could be used to ]provide an artistic touch to the garden, lake care to plant out of the way of traffic. Grows 8 lo 2U ft high, S to 15 ft. wide. Zones 6 to 9r China, Korea.

Polygonum oubertn flower*

f\>norti; ft> foliota Wem spines po/kjît/5 trifotiata 1 tower

Polygonum oubenu, Si!ver-Vine He<*ef lower

Poncirus tntohata, Hardy-Orange

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Popvtus, alba 'Pyrarrvdalii', Bolleana PopljT

Popofus alba 'Pyramhdaiis' foliage

Popuhji aibar White Popfjf

Populust Poplar

In alt my travetli\g and consulting work, I ha\* never rccommcndcd, at least when awsamis, a poplar. The spedrs are1 susceptible to fun$at leaf ipots that virtually defoliate trees by hit summer. Cankers can also cause injury or death. Fttplurs ate dirty trees, dropping leaves^ twigs, and branches with minimal pru\i>-cativtt The$etius Populus Jots con tain many cold-climatc species that harbor iin affinity for moisture.

Populus alba

Silver or White Poplar

Silver Poplar is a wide-spreading tree with on irregular, round-topped crown. The hark is creanv colored. The three- to five-lobed, 2- to S-in -long leaves are lustrous dark green above and covered with white, woolly pubescence on the undersides. Although adaptable to dry soils, this s|>e* cies is longer lived in moist situations, ^or cold climates, it is a possibility, but beware, because diseases can wreak havoc. The species also develops suckers that result in large colonies. Grows 40 to 70 ft. high and wide. Zones 3 to Europe, Asia.

( ultivars and Varieties, 'IVramidalis' the Koheana Toplar, is columnar in habit and maintains this trait into old age. Grows 70ft, high, 12 to IK ft. wide,

Popuhji aibar White Popfjf

Popvtus, alba 'Pyrarrvdalii', Bolleana PopljT

Popofus alba 'Pyramhdaiis' foliage

Populus deltoides

Eastern Cottonwood

As one travels west through Kansas and Nebraska, this species becomes the most common vigli t along watercourses. It has an upright-spreading, vase-shaped habit and an irregular, ragged branch structure. The ash-gray bark is divided into thick, flattened ridges, separated hy deep fissures, f he dark green, deltoid leaves, 3 to S in. long and wide, may turn a respectable yellow in tall Where few other trees will grow and for quick cover. La stern Cottonwood Is justified. Several male selections or hybrids (usually with Papiilus nigra as the other parent) are available, and these seedless forms do not produce the cottony froth in spring of the typical species These forms grow 2 to 4 fx. per year <Srows 7* to HK) ft. high, .SO to 75 ft. wide. Zones 2 to Quebec to North Dakota, south to Florida and Texas,

Cultivars and Varieties. "Noreaster' and 'Siouxland' are two of the better male cultivan, although the latter tends to shed abundant leaves hy late summer in the lower Midwest.

Populus nigra 'Halica'

Lom hardy Poplar l.ombardy Poplar is a common sight throughout the Kast and Midwest, where it postures like a Titan rocket ready for launching. To most horticulturists, this tree is taboo because of its susceptibility to a devastating canker. Interestingly, in Europe, BO-ft,-tall trees are common in the countryside, suggesting that specimens in Kurope may not be as susceptible to the canker. 1 he distinctive columnar, telephone pole-like habit limits contemporary Landscape use. The 2- to 4*in.~long, dark green leaves do not color to any degree in fall, although some yellow Is possible. Grows 70 to 90 ft. high, HI to 15 ft wide in 20 to 30 years. Zones A to 9.

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