Can you suggest when is the best time to apply fertilizer to my lawn, and as a last question, I want to use a chemical free product.
That is a good question. For the spring time of the year, right now is the best time to get food down to the turf roots. My suggestion is to watch when the forsythias are in bloom as that tells me the soil temps have hit the 52-54 degree range. Especially now that we are having early Spring rains to water in the fertilizer, I would put down your first application of nitrogen.
As far as what type or sort of turf food to use, the answer to that is Go Green. (no pun intended!) Most lawn care companies apply “Death Chemicals” to the turf which are all harmful. We suggest a plain simple mix of organic potash, potassium and nitrogen, as a real healthy lawn needs no chemicals what-so-ever to maintain a lush green safe place to enjoy your out-of-doors living room.