Hey mate, NSW here. The soil level looks very low, and if your growing outdoors in the WA sun, phew !!! There is little or no airflow for the little ones and those black pots will superheat the surrounding air inside the pot. Imagine sitting in a 4ft hole lined with black plastic in the middle of the day. More to the point however, when you say "blood & bone soil" + perlite, do you mean a soil/compost with blood n bone + perlite added ? If it's pure blood n bone + perline only as your mix, thats not gonna be very good.