Trouble knowing when a grapefruit is fully ripe

va_canuck(8A)January 12, 2010

This may sound dumb... I have lemons and key limes that I never have wondered about their ripeness, but my grapefruit is confusing me.

It's a Thompson Pink Seedless variety. The fruit are about 4 inches in diameter, fairly firm, but the color is changing to yellow. One in particular is almost fully yellow. It just seems a little small to me for a grapefruit - is the color a good enough indicator, or will it continue to grow?

My lemons and key limes are massive.... should I just let it be and see if they get bigger?

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va_canuck(8A)

Forgive me for not simply internet searching first.

"The fruit is oblate to round, of medium size, 2 3/4 to 3 3/4 in (7-9.5 cm) wide; peel is light-yellow"

Sounds like one is almost ready to go! Yay!

    Bookmark   January 12, 2010 at 10:14AM
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softmentor(z9/sunset13 CA desert)

There can also be a lot of variation of size on one tree.
By the time they start to color up, they are pretty much full size and will not grow much bigger.
They may still get a little sweeter over the next 2 months. We are already picking but we have enough to keep us going through April and sometimes into May (5 grapefruit trees)

    Bookmark   January 16, 2010 at 12:06AM
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danasplants(9a)

The out side peel will get a pink spot on it that to me and smell when grapefruits are ready like any fruit they smell awesome!

    Bookmark   January 22, 2010 at 6:59PM
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malcolm_manners

Danas, while most red grapefruit develop a pink spot on the surface, as you say, 'Thompson Seedless' specifically does not. It never shows any trace of pink pigment in the flavedo (yellow part of peel) nor the albedo (white part of peel).

VA Canuck -- for us in central Florida, Thompson is often ready by mid- to late-November. But because the maturity date will vary with weather (especially temperature), about the only way you can tell for sure is to try one and see if it is to your liking. Grapefruit can usually hang on the tree for months after they're ready, just getting better and better, so you might wait until they begin to fall, and realize at that point that you could have started picking a couple months earlier.

    Bookmark   January 22, 2010 at 9:26PM
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