So exactly what is tomato blossom end rot?
As it turns out, blossom end rot is neither a disease nor an infection. And, it can’t spread to other plants either. Blossom end rot is actually caused by a nutrient deficiency in the soil, or more specifically, a lack of available calcium coming into the plant.
As you will see below, sometimes that is due to the soil not having enough calcium in it. But quite often, a lack of calcium can instead be due to watering issues – with either the plant’s roots being too dry and unable to absorb nutrients, or too wet and soggy to absorb them.
Blossom rot affects the fruit of a plant. It is most common in tomato and pepper plants, but can occur with other vegetable plants as well. The first sign of end rot is the formation of a tiny brown spot on the blossom end of the tomato.
At first, the spot will simply become soft. Early on, it does not affect the rest of the tomato fruit. However, as time passes, the circular soft spot will begin to enlarge, decaying the fruit on that end in the process. When it’s all said and done, by the time the fruit ripens, it’s mushy and rotten – and certainly inedible. READ FULL ARTICLE