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1、ThephysicalpropertiesofplantsAnobviousphysicalpropertyofanyplantisitsform.plantingdesignersareusuallyconcernedwiththematuresilhouette*ofaplant,butitsintermediateshapesshouldalsobeconsidered,particularlywhenaplantdevelopsslowly.Mostplantformsareroundedandm
2、orehorizontalthanverticalinshape.Roundedorhorizontalshapesarelessdramaticthanthosewithverticalemphasisbecausetheyaremoreexpectedandtheymorenaturallyfollowtheshapeoftheterrain.Verticalshapesdemandattention,evenstartlingtheviewerattimes.Nativeplantsformsusu
3、allyconformtolandforms(seefigure2-1).Inmountainousreionstheverticalshapesprevail,reflectingthesharppeaksandjaggedrockconfigurationspfthearea.Horizontalplantformsaremostcommomontheplains,andinrollingorhillyterrainroundedplantformspredpminate.Landscapedesig
4、nersdowelltoremeberthis,usingthenaturalplantformsofanareainadesignandreservingtheunusualformsforemphasis.Althoughthefoermofeachplantisunique,therearegeneralclassifivationsofforms.Treescanberound,columnar,vase-shaped,weeping,pyramidal,oroval.Theoutlineofat
5、reedependsonitsbranchingpattern.Narrowcrotchanglesatthepointwherelateralbranchesseparateformthetrunkcauseuprightforms,themoreroundedformsarecausedbywiderangles.Shrubsmayberound,oval,pyramidal,oroblong;themaybeprostrateorcreeping.Partofaplant’sformistheres
6、ultofthegrowthhabitoftheplant.Insomeevergreens,forexample,thebranchesoverlayoneanother.Theplant’sformtakesonanirregularlinebecauseofthislayering.growthhabitshouldalwaysbeconsideredtobeanelementofform.Thebestwaytostudyplantformsistovisitapark,arboretum,oro
7、therareawherematureareinplentifulsupply.Comparetheformscloselytoclassifyspecificplantsandnotetheminordifferenceswithinclassifications.Visittoanurseryarehelpfulforstudyingtheformsofyoungorintermediategrowthstagesofplants.Thesilhouetteformedbyagroupofplants
8、isprobablythemostimportantcontributionofformtolandscapecomposition.Theformofplantsinsilhouettemustallowforfunction(shade,screening,windprotection,enclosure,andsoon),whileprovidingpleasinglinesatthesametime.Stems,lea
