I live in Georgia and this is my 3rd year for planting tomatoes in my Earthbox. This year I started watering more frequently and I'm seeing blossom end rot on one of my first tomatos. I planted my box with soil from last year and used everything in the replant kit. I have also been adding the Calcium Nitrate once a week as directed. I'm wondering if I'm watering too often. I have experienced blossom end rot in previous years, but usually not until closer to the end of the growing season. Any thoughts? Thanks