Soil for Pots

[greenrebellion]

Hey all,

What do you guys usually use for your grass pot soil? Last year I used THIS and the pots germinated super quick and grew in super thick but...this this product really isn't soil, looks to be primarily compost and peat moss. Not sure if it is ideal to be installing plugs of this stuff as you'll have native soil and then a plug of non-soil area.

Any thoughts? What do you guys use?