Buy packet of seeds for, lets say Curly Kale.
Open packet and sow either half or all of the seeds in a tray.
When they are a couple of inches tall prick them out into 3" pots.
Note carefully that I did not say prick out the twenty best out of the fifty or one hundred seedlings in the tray.
How ruthless or wet are you with those little plants you lovingly grew when it comes to the pricking out stage?
Do you find it hard to discard them, despite knowing that you have room for two rows of Kale 30' long, thus 30 plants at most.
As for tomatoes, well
