Posted: 22/06/2017 at 15:54
It's taken me several years to get the hang of it.
I sow the seeds fairly thinly in a seed tray indoors in April .... when they're about an inch tall I lift the seedlings, about half a dozen at a time (I use a dessert spoon and try not to touch the seedlings at all - they bruise easily) and pot each clump into a large module in a plastic tray and keep them indoors on the windowsill.
When they're ready to pot on I transfer the whole clump into a bigger pot. and then they go out into the mini-greenhouse with plenty of fresh air in the daytime but shut up at night.
Now the temps are in the mid teens most nights I leave the little greenhouse top open.
All the time they get very careful watering ... only watering when the top of the compost is beginning to dry a bit and never getting the leaves wet .
Once the basil plants are growing nicely in their final pots they only get watered from below, putting an inch of water in the tray and any water remaining after 20 mins is thrown out.