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1、ThephysicalpropertiesofplantsAnobviousphysicalpropertyofanyplantisitsform.plantingdesignersareusuallyconcernedwiththematuresilhouette*ofaplant,butitsintermediateshapesshouldalsobeconsidered,particularlywhenaplantdevelopsslowly.Mostplantformsareroundedandmorehorizontalthanv
2、erticalinshape.Roundedorhorizontalshapesarelessdramaticthanthosewithverticalemphasisbecausetheyaremoreexpectedandtheymorenaturallyfollowtheshapeoftheterrain.Verticalshapesdemandattention,evenstartlingtheviewerattimes.Nativeplantsformsusuallyconformtolandforms(seefigure2-1)
3、.Inmountainousreionstheverticalshapesprevail,reflectingthesharppeaksandjaggedrockconfigurationspfthearea.Horizontalplantformsaremostcommomontheplains,andinrollingorhillyterrainroundedplantformspredpminate.Landscapedesignersdowelltoremeberthis,usingthenaturalplantformsofana
4、reainadesignandreservingtheunusualformsforemphasis.Althoughthefoermofeachplantisunique,therearegeneralclassifivationsofforms.Treescanberound,columnar,vase-shaped,weeping,pyramidal,oroval.Theoutlineofatreedependsonitsbranchingpattern.Narrowcrotchanglesatthepointwherelateral
5、branchesseparateformthetrunkcauseuprightforms,themoreroundedformsarecausedbywiderangles.Shrubsmayberound,oval,pyramidal,oroblong;themaybeprostrateorcreeping.Partofaplant’sformistheresultofthegrowthhabitoftheplant.Insomeevergreens,forexample,thebranchesoverlayoneanother.The
6、plant’sformtakesonanirregularlinebecauseofthislayering.growthhabitshouldalwaysbeconsideredtobeanelementofform.Thebestwaytostudyplantformsistovisitapark,arboretum,orotherareawherematureareinplentifulsupply.Comparetheformscloselytoclassifyspecificplantsandnotetheminordiffere
7、nceswithinclassifications.Visittoanurseryarehelpfulforstudyingtheformsofyoungorintermediategrowthstagesofplants.Thesilhouetteformedbyagroupofplantsisprobablythemostimportantcontributionofformtolandscapecomposition.Theformofplantsinsilhouettemustallowforfunction(shade,scree
8、ning,windprotection,enclosure,andsoon),whileprovidingpleasinglinesatthesametime.Stems,lea