Some time ago I purshased some grapefruit, i took the seeds and now I have little grapefruitplants. But i was wondering what the name is of the cultivar. The fruit had a little sticker on it "Indian River Dolphin 4027 Florida". Is that the cultivar?

(Sorry if my English isn't good I'm not from the US but from Northern Europe )

It was packed under the Dolphin label, in the Indian River area of Florida. What color was the flesh of the fruit? If white (palest yellow), it would be 'Marsh Seedless'. If medium pink, with the palest blush of pink in the albedo (the white part of the peel), it would be 'Ruby Red', also often marketed as "Marsh pink" (unfortunately). If the flesh is deep red, with a deeper blush in the albedo and substantial red on the exterior of the peel, it would be either 'Flame', 'Rio Red' or 'Star Ruby'. Those three can be a bit difficult to tell apart from just one fruit, but in general, 'Star Ruby' will be crunchier in texture (tougher juice vescicle walls), and will have the largest open core of the three. From a single fruit, it would be difficult to identify 'Flame' from 'Rio Red' with any degree of certainty. All of those varieties are being grown in the Indian River area, and all are shipped to Europe.

If it was 'Star Ruby', your seedlings may show some white or yellow variegation on some leaves, but not all of them. The other varieties seldom show any variegation at all.
Malcolm

The PLU code 4027 says:
4027 Fruit: GRAPEFRUIT Ruby/Red/Pink, Small, Restricted for items grown in East N.A., size 40 and smaller.

Well, at least we know it's not Marsh. But that PLU could be used for nearly red or pink variety.

I understand it as being ruby red. But it is true the the PLU codes are not very precise.

The seedlings do havesome white variegation on some leaves. The other leaves seems to be "perfect". I don't know what the colour of the flesh was. We always buy red and yellow. . I googled and i found a picture of 2 grapefruits that looked like the things we bought:
http://www.chefdecuisine.com/all_fruit/citrus/grapefruit/images/grapefruit_440x330.jpg
I think it was the seeds of the red one I used ( my mom always buys the red ones, although I like the taste of the yellow more).

So is it a red ruby then? Is it a good cultivar?

The French PLU codes are a little more precise. It says:
Ray Ruby, Ruby or Ruby Red.

Yes the PLU is used for more than one variety. Ray Ruby and Ruby Red are not the came variety. But your photo does look like Ruby Red (no open core in the center). But then you should not be seeing leaf variegation. Perhaps you're seeing a mineral nutrient deficiency? If it's a true variegation, I'd say it's most likely 'Star Ruby'.

Malcolm

About 20 days later, it has green leafs with no variegation.
When the plants are bigger and more treelike I will post a picture .
And finally my lemonplants are coming out of the soil