I've had some recent seed starting conversations with my good gardening friend Joe Lamp'l, which are available as a pair (part 1 and part 2) of podcasts on his wonderful joe gardener website. I've also received many questions on email, Instagram, Twitter and Facebook about the dense planting applicability to other crops.
Let's make this blog short on words and long on pictures. By the way, the answer is YES! Check out the following pictures:
So - yes - I use this method for: tomatoes, peppers, eggplant - and, beets, lettuce, Asian greens, many herbs, leeks, many flowers. It is a huge space saver - just a great efficiency tool. And....development of a love of transplanting is a must!