I live in a small town. The city picks up all the tree limbs in town and with a chipper we have a HUGE pile of free mulch. 25'x30'x6' I have a small garden (16x24) with clay in the soil. Should I use the free mulch not knowing what tree mulch I will be getting? I can get as many truck loads I want. Also just getting into organic gardening what do I need to put in the soil for the Spring planting?
That mulch should be fine (watch for fire ants and other critters when you handle it). As for the garden soil, finished compost is an important ingredient. You probably will profit from reviewing the Dirt Doctor's Basic Organic Program and other material at, or linked from, the home page here.