Question: what is the difference between potting compost and multi purpose compost?
Answer: Potting compost is defined as a medium in which to grow plants in pots or other containers. ... What's more, multi-purpose compost doesn't work very well for growing seeds, as the particles can be a bit big, and it can also dry out quite quickly. A good alternative is a loam-based compost, such as the John Innes composts.