In Unity 4.6 you do not use scale. You go to where the icons are for setting skins (textures), its under the gear icon. Its at the end of that row where you choose trees, or plants, etc. You set the size under Width and Length. It's default is 2000 x 2000.
You do not need to mess with scripting it, that will just mess things up.
Hope this helps.
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