Well if its seed you might end up waiting 30 years until a fruit, but if its from seed it doesn't grow true to type...

True... But is there a lemon that's has this purple-red hue in the joints when growing?

Most lemons grow true to type. Meyer is an exception. But my personal feeling is, it doesn't matter what it is. It will likely never bloom for very, very long time.

Are you sure that's a citrus? Stem looks really thick. It may be. I'm just asking. Who planted the seed?

I planted the seed (peeled back the pith around the seed, put it in a damp paper towel till it germinated, then to soil)

The bag of lemons I bought and used for this did not have a name

Im going to stress again how slow of a grower it is.. And the leaves are staying small compared to most lemon leaves

I agree with pip. once it is about a foot tall it will have a good root structure and should grow very fast.

I've noticed with some plants that they are a little Purple when young so maybe wait a month or 2

If it was a grocery store lemon it's most likely a eureka or lisbon. Next time make notes about the fruit itself because that was your only chance to ID it. Now you have to wait for it to fruit.

If it were me, I wouldn't waste time trying to get it to fruit but use it as rootstock and graft to it. It's literally the difference between getting fruit in 3-5 years or 10-30 years, if ever. Being in zone 6 I'm not sure you would ever get the tree to fruiting size. That's what your waiting for, size not years.

It will certainly make an interesting foliage houseplant though.

So even if I have it under lights all winter and full south sun all summer there's still a good chance it'll take a long / never flower?

My understanding of citrus maturity is once it's reached a certain amount of nodes / age?

Pip has given you good advice. I once planted 500 "Meyers" from seed; at the same time I planted 500 grafted Meyers from California next to them. The grafted Meyers produced fruit in 18 months; the seedling "Meyers" did not produce a single flower in 4 years (when I took them out)

And John lives in guatamala where growth is like 4x as much as you would recieve. Guatamala gets double the growth of Florida according to a study I've read.

Keep your lemon tree and have fun growing with it. If you want fruit wait a year before buying a grafted tree so you have time to learn the ins and outs with growing paings.

Good advice, Steve... kinda like training wheels, or in the 3rd world we give poor people goats for a couple of years before we give them cows.

Thanks John. I lost close to 300 citrus seedlings before I got anything more than 6 inches tall,. now most of my seedling live. It took a lot of experience before I would feel safe on a grafted tree.