I just watched a video about growing tomatoes and there was a pretty clever trick for starting the plants that I wondr if it would be applicable to our favourite herb.
This guy started the seeds in solo cups that he filled only halfway with potting soil.
Because tomato plants can grow roots from their stem, he waits until the plant is above the rim of the cup then he backfills with soil the rest of the way, burying the stem. The stem will then proceed to sprout roots into that soil. When it comes time to transplant into the garden or a larger pot, there is an extensive root system developed.
This method would seem to really optimise the space in the solo cup (or whatever you use) allowing for maximum root development AND a stronger main stem on the small plants.
Would this method also work on herb, specifically, would roots sprout from the stem after being buried the same way they do with tomatoes?