You are lucky. It is one of my son's worst. Yes, in the West we have bermuda grass and it grows all year. We tried a ragweed kit this year. I can't tell if it has made much difference.
Some people swear by it.
It is only four shots right before ragweed season and must be repeated every year. Ask the pediatric allergist. The new leukotriene modifier drugs seem to work better in people with allergies and asthma together. Your welcome for the explanation. Glad it helps.