Soil blocking is a great alternative rather than using trays or pots for seed starting. All you need is soil/mix and the soil blocker
My DIY mix:
3 part coconut coir - 1 part perlite - 1 part vermiculite - 1 part compost
You do not need all these things to start seeds indoors. previously I just put all my seed trays on the laundry room counter with lights hanging. Some people even use a sunny window.Â
There are various grow light options as well!