Meanings
rhubarb (any plant of the genus Rheum, especially Rheum rhabarbarum, having large leaves and long green or reddish acidic leafstalks that are edible, in particular when cooked (although the leaves are mildly poisonous))
rhubarb (the leafstalks of common rhubarb or garden rhubarb (usually known as Rheum × hybridum), which are long, fleshy, often pale red, and with a tart taste, used as a food ingredient; they are frequently stewed with sugar and made into jam or used in crumbles, pies, etc)
Aus den Stielen des Rhabarbers kann man ein säuerliches Kompott machen.
Examples
GermanEnglish
Tom baut Rhabarber an.Tom grows rhubarb.
Heute Abend gibt es Salat mit Rhabarber.Tonight we're having lettuce with rhubarb.