in 1984, the Rio Red grapefruit variety is a relative newcomer to the citrus
scene. Derived from the Ruby Red grapefruit, Rio Red typically grows well in
hot inland regions and is winter hardy in zones 10 to 12. The seedless fruit
has blushed skin, attractive light-burgundy flesh and an excellent sweet-tart
Rio Red fruit
is small in size, with a slightly pebbled surface. The rind frequently develops
a reddish blush, especially where two fruits grow against each other. The flesh
is juicy and well-pigmented, with the darkest color next to the segment
membranes. Rio Red fruits mature mid to late-season. The trees grow vigorously
and are relatively large in size.
Generally speaking however, late autumn is when grapefruits
are ready to pick. Mature fruit may be left on the tree and, in fact, will
sweeten throughout the winter. This method enables you to “store” the fruit for
a longer period of time than if you picked it all at once. The downside is that
storing on the tree reduces the yield the succeeding year. So, late fall into
the winter or early spring is when to harvest grapefruit.