Citrumelo 'Dallas' (Trifoliate x Grapefruit) Bob McCartney American gardeners owe the plant

American gardeners owe the plant to the Arnold Arboretum

For native-garden makers the real value runs deeper than looks: oblongleaf twinflower is a documented larval host for the common buckeye butterfly

go easy on fertilizer and give the roots sharp drainage

selected by Michael Dirr

Citrumelo 'Dallas' (Trifoliate x Grapefruit) Bob McCartney American gardeners owe the plantSourced originally from the noted citrus enthusiast Tom McClendon, Citrumelo 'Dallas' is a cold hardy hybrid between the rugged trifoliate orange, Poncirus trifoliata, and a grapefruit. From that unlikely pairing comes a vigorous small tree that carries the trifoliate's toughness and a good measure of grapefruit character in the fruit. The fruits are large and round, with a thick, textured rind and strikingly big seeds, and the flavor is bold, tart,