Posted: 22/05/2016 at 10:46
Hi Michael - when you buy a pot in a supermarket, it usually contains loads of individual plants, so you can split them up.
I use multi purpose compost, sow thinly and keep the pots on the kitchen windowsill. I split them once they're a few inches tall and pot them on, giving some to friends. They can take quite a bit of watering as long as they don't sit in wet soil. I think a JI might be too heavy for them.
Lief - I use quite a lot of basil so I just keep picking it till the plant's exhausted. A few seeds in a 4"pot gets quite bushy if you pinch out the tips and if I have three or four pots, that lasts a good few weeks. I do a few more pots a few weeks after the first sowings to get a succession of plants. It really depends how much you use.