Re: top soil trouble
Most "top soil" that you purchase is little more than garbage soil with sand and a touch of compost added. The sand breaks up the clay, the compost gives it color. The problem is not enough compost or organic material to really change the composition of the soil, you still got garbage soil. Adding manure in particular, but large amounts of any organic matter will greatly help the fertility of the soil.
Moss growth on fallow, bare ground is common. I recommend improving the soil with organic matter, then plantings with drip irrigation at the plants, then a thick layer of mulch which will help keep weeds and nasties down to a minimum. If you've got a problem with weeds, then you may want to spread preemergent before the mulch is laid.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!