March can be such a finicky month! Several years ago, there was a long warm spell followed by two nights of extremely cold temperatures. The result was a massive dieback of Hydrangeas and a resulting loss of blooms for that year! Some years we see snow storm after snow storm, while some years it is merely rain. So far it has been a somewhat warmer winter with less than average snowfall. Keep referring to your notes or diary from last year as to when you sowed seed and performed other chores as you need not reinvent the wheel.