Lemon seed / tree grafting or propagation?

Question

I planted 3 lemon seeds a few years ago. The seeds came from a lemon that I got from the grocery store...
Anyway, they are taller than the house now, but have never produced flowers or lemons.
I was reading that it may take up to 15 years for them to produce. Unless they are grafted or propagated from an already producing tree...
Well I do have a lime plant that produces, so I was wondering how this could be done and what would I get?
Limons? lol
I searched google, but couldnt find what I was looking for.
Can anyone explain, or give me a good website that shows me what to do?
Thanks!

Answer 1

Here i hope this helps you. THis site also explains on climate and soil on other pages within this site. Hope this helps.
Good luck and happy planting.