I use a completely different approach
I sow four seeds to a cell in module trays, thin to leave four seedlings per cell when they're about an inch tall and then plant them out in their final positions once they're about two inches tall. I harvest the largest from each clump of four when I want them (by twisting the plant off the root) and leave the others to grow on.
I think they will grow very easily, but pests such as slugs and snails (and deer, around here) can mow a patch of seedlings down overnight and you'll be left with no evidence, believing they won't grow for you.
James