I think grapefruit are typically grafted onto rootstock to ensure that you get the same fruit as the parent.

Here is a link that might be useful: Growing Citrus Trees

see link below

Here is a link that might be useful: UF Article

this link shows you how to graft yourself

Here is a link that might be useful: Grafting Citrus

Thanks for the links!!! The below info describes EXACTLY how my grapefruit tree is growing...very interesting. I guess I'll toss the seedling this weekend.

"...if you plant the seed from an especially tasty orange and nurture that tree for better or worse, you may have to wait 8 to 15 years for that seedling tree to bear fruit. Your seedling tree may grow straight up without much branching and may be very thorny. (Even budded Meyer lemon, Bearss lemon, and grapefruit trees can be thorny too.)

In most cases, your seedling tree will produce fruit
similar to that of the parent plant. Even then, fruit
quality from the seedling tree may not be as good as
that from the parent tree for several years after fruit is
first produced. And you'll never get the added,
beneficial effects from a carefully chosen rootstock."

yumtomatoes,

If I graft myself, as you say, which part of me do I take for a cutting?
Will just my little pinky finger work or Is it better to take a toe to graft and work from the bottom up?

MOO

i threw a bunch of seeds(pink grapefruit) in here and this is what came up ,covered in thorns (spikes)up the stock,any input would be helpful on this matter

Lou, you always make me laugh.

Clearly late to this but I understand Mexican(Key) lime & Ponkan tangerine/mandarin do grow true to seed...?

Baby red grapefruit

Baby red grapefruit

{{!gwi}}

FACT: 90% OF ALL CITRUS VARIEITES ARE POLYEMBRYONIC WHICH MEANS IT WILL GROW TRUE FROM SEED!!!!!!!!!

They might take longer & be thornier, but most will grow true. In some cases the tree might even live longer & be less likely to be disease prone when grown from seed.

Citrus have problems & often die young or need to be replaced. Plant a grafted tree for today & seedling trees for the future.

I'm growing lemon seeds, just for fun. I know they'll have thorns, but I'm really getting into bonsai, so I may just cut the thorns off. Or I may throw them away. Who knows? I just like watching the seeds come up.