grape vine, wild grape
萄 refers specifically to grapevines, especially wild grapes. It is almost always used in the compound 葡萄 (ぶどう, grape).
萄 combines 艹 (plant) with 匋, which likely contributes the sound. The character was created to represent the grape plant.
The top 艹 shows it's a plant, and the bottom 匋 looks like a bundle of grapes hanging from a vine. Together they make the grape vine.
For ドウ, picture a grape vine growing over a doughnut-shaped trellis: dough -> ドウ, and the grapes hang down like doughnuts.
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grape; grapevine
crimson glory vine (species of grapevine, Vitis Coignetiae)
The Grapes of Wrath (novel by Steinbeck)
sea grape (Coccoloba uvifera); baygrape
Kōshū (grape variety)
white wine
grape juice
raisin bread
phylloxera (Daktulosphaira vitifoliae)
grapevine trellis
staphylococcus
grapevine
reddish grey (colour)
red wine