<human>: Objective: How can I create my own potting soil mix?

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- To make your own potting soil, mix 3 parts old soil, 1 part vermiculite, 1 part ring worm compost and a few scoops of fertilizer.
- To make your own potting soil, mix 3 parts old soil, 1 part vermiculite, 1 part worm compost and a few scoops of fertilizer.
<bot>: To make your own potting soil, mix 3 parts old soil, 1 part vermiculite, 1 part worm compost and a few scoops of fertilizer.