There are all kinds of things you can put in the bottom of a pot before you fill it. Some people use rocks, others use pieces of broken pottery, some people use packing peanuts and others use those little special plastic inserts that are made just for that purpose.
I used to use rocks, but then I got sick of picking rocks out of my potting soil when I put it into the compost bin, so I started using broken pieces of pottery. I soon ran out of those since I pot up so many plants each spring, so I started using pieces of landscaping cloth.
I find that this works particularly well for me. When I empty the pot I simply pull off the piece of fabric and put it back in the pot so it’s ready to go next spring.
What do you use in the bottom of your potted plants?