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1、ThephysicalpropertiesofplantsAnobviousphysicalpropertyofanyplantisitsform.plantingdesignersareusuallyconcernedwiththematuresilhouette*ofaplant,butitsintermediateshapesshouldalsobeconsidered,particularlywhenaplantdevelopsslowly.Mostplantformsareroundedandmorehorizontalthanve
2、rticalinshape.Roundedorhorizontalshapesarelessdramaticthanthosewithverticalemphasisbecausetheyaremoreexpectedandtheymorenaturallyfollowtheshapeoftheterrain.Verticalshapesdemandattention,evenstartlingtheviewerattimes.Nativeplantsformsusuallyconformtolandforms(seefigure2-1).I
3、nmountainousreionstheverticalshapesprevail,reflectingthesharppeaksandjaggedrockconfigurationspfthearea.Horizontalplantformsaremostcommomontheplains,andinrollingorhillyterrainroundedplantformspredpminate.Landscapedesignersdowelltoremeberthis,usingthenaturalplantformsofanarea
4、inadesignandreservingtheunusualformsforemphasis.Althoughthefoermofeachplantisunique,therearegeneralclassifivationsofforms.Treescanberound,columnar,vase-shaped,weeping,pyramidal,oroval.Theoutlineofatreedependsonitsbranchingpattern.Narrowcrotchanglesatthepointwherelateralbran
5、chesseparateformthetrunkcauseuprightforms,themoreroundedformsarecausedbywiderangles.Shrubsmayberound,oval,pyramidal,oroblong;themaybeprostrateorcreeping.Partofaplant’sformistheresultofthegrowthhabitoftheplant.Insomeevergreens,forexample,thebranchesoverlayoneanother.Theplant
6、’sformtakesonanirregularlinebecauseofthislayering.growthhabitshouldalwaysbeconsideredtobeanelementofform.Thebestwaytostudyplantformsistovisitapark,arboretum,orotherareawherematureareinplentifulsupply.Comparetheformscloselytoclassifyspecificplantsandnotetheminordifferenceswi
7、thinclassifications.Visittoanurseryarehelpfulforstudyingtheformsofyoungorintermediategrowthstagesofplants.Thesilhouetteformedbyagroupofplantsisprobablythemostimportantcontributionofformtolandscapecomposition.Theformofplantsinsilhouettemustallowforfunction(shade,screening,wi
8、ndprotection,enclosure,andsoon),whileprovidingpleasinglinesatthesametime.Stems,lea
