Maybe if you actually posted the foto??

That's odd, it showed the photo in my preview- I'll try again!

Neither one is a lemon; look at the winged petiole, no lemon has that. Beyond that, I don't know what you have.

I would assume if your planted a grapefruit seed, you have a grapefruit.

Firstly, thanks very much for your insight.

If it's not a lemon then they'd probably have to both be grapefruits, but why would they sprout so differently from each other, with one having five leaves and the other having four?

They both look like grapefruit. You can tell by the leaf shape, as the poster above mentioned. Other citrus doesn't have that. As for 4 or 5 leaves, it's not that unusual.

If you planted the seeds yourself from fruit you saved, you can end up with a weaker tree than if you purchased a tree at the nursery. Flavorful budwood is grafted onto hardy but not so flavorful rootstock.

Here is a link that might be useful: What's Growing On?

the oils inside a lemon leaf smell strongly like a lemon. Grapefruit, at least my grapfruit seedling, doesnt have that smell. Limes smell like limes also.

break open a leaf and smell.

mike

Thanks for the relies, everyone!

And, lemons are almost across the board not true to seed. John is correct - that winged petiole is also not found on lemons, but mainly on grapefruits and pummelos. And Mike also gave you great advice - lemon tree leaves smell strongly like lemons. Very nice seedlings, though! It will be interesting to see what you end up with!

Patty S.

Patty, it is my understanding that most citrus seeds are polyembryonic. The first sprout from a polyembryonic seed almost always grow true to the parent fruit since they are not pollinated.

John