Potting mixes double hatting as a seed raising mix- or perhaps just use Coir.

Normally potting mix would be used for potted plants, as these from a sister clubs member Ken.- 20/2/2016

Here is one premium brand, seeds sown Australia day, Jan 26.

Another premium

Another Premium, but the seeds haven't reached the graduation line of  Zero.

 These seeds were planted one week ago, and are taller than some of the 3.5wk seedlings.

The coir a week ago.