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1、ThephysicalpropertiesofplantsAnobviousphysicalpropertyofanyplantisitsform.plantingdesignersareusuallyconcernedwiththematuresilhouette*ofaplant,butitsintermediateshapesshouldalsobeconsidered,particularlywhenaplantdevelopsslowly.Mostplantformsareroundedandmorehorizon
2、talthanverticalinshape.Roundedorhorizontalshapesarelessdramaticthanthosewithverticalemphasisbecausetheyaremoreexpectedandtheymorenaturallyfollowtheshapeoftheterrain.Verticalshapesdemandattention,evenstartlingtheviewerattimes.Nativeplantsformsusuallyconformtolandfor
3、ms(seefigure2-1).Inmountainousreionstheverticalshapesprevail,reflectingthesharppeaksandjaggedrockconfigurationspfthearea.Horizontalplantformsaremostcommomontheplains,andinrollingorhillyterrainroundedplantformspredpminate.Landscapedesignersdowelltoremeberthis,usingt
4、henaturalplantformsofanareainadesignandreservingtheunusualformsforemphasis.Althoughthefoermofeachplantisunique,therearegeneralclassifivationsofforms.Treescanberound,columnar,vase-shaped,weeping,pyramidal,oroval.Theoutlineofatreedependsonitsbranchingpattern.Narrowcr
5、otchanglesatthepointwherelateralbranchesseparateformthetrunkcauseuprightforms,themoreroundedformsarecausedbywiderangles.Shrubsmayberound,oval,pyramidal,oroblong;themaybeprostrateorcreeping.Partofaplant’sformistheresultofthegrowthhabitoftheplant.Insomeevergreens,for
6、example,thebranchesoverlayoneanother.Theplant’sformtakesonanirregularlinebecauseofthislayering.growthhabitshouldalwaysbeconsideredtobeanelementofform.Thebestwaytostudyplantformsistovisitapark,arboretum,orotherareawherematureareinplentifulsupply.Comparetheformsclose
7、lytoclassifyspecificplantsandnotetheminordifferenceswithinclassifications.Visittoanurseryarehelpfulforstudyingtheformsofyoungorintermediategrowthstagesofplants.Thesilhouetteformedbyagroupofplantsisprobablythemostimportantcontributionofformtolandscapecomposition.The
8、formofplantsinsilhouettemustallowforfunction(shade,screening,windprotection,enclosure,andsoon),whileprovidingpleasinglinesatthesametime.Stems,lea
