16. What is the best potting mix to use for plant propagation?

There are probably as many different propagating mixes as there are propagators. With experience, most propagators develop their own variations to suit the conditions that they have available.

To start with, however, it's hard to go past the often recommended sand-peat moss mix in the ratio of about 70% sand and 30% peat. These days many growers are turning to the artificial peat mosses which are becoming available and which are made from such waste products as coconut fibre. Experience so far indicates that the artificial products are capable of excellent results. The sand used should be clean and should have a high proportion of grains in the 1 to 3 mm range.