A watermelon should exhibit shape and rind color characteristic of its variety. All varieties should be firm and symmetrical. Watermelons should be
ripe upon arrival; they do not ripen after harvesting. Ripe indicators include a dull rind, dried stem, and yellowish underside where the melon touched the ground. A ripe watermelon will produce a distinct hollow sound when thumped. Immaturity is indicated by a shiny rind and a white, pale green, or light yellow underside.