You don't, you buy it.

True! It is possible to make it, and there are umpteen recipes for different plants, on the web and in old gardening books, but it is a messy, stinky process. Always better to let the wholesalers do it in job lots and bag it up for us!

Compost for plants in pots in the garden is a different matter...

Still slightly messy, but not as stinky, since you don't have to pasteurize it in the oven.

Thankfully! We make all our own potting compost for bulbs in pots