What cause blossom rot on tomatoes?

my mom's tomatoes have blossem rot i was woundering what cause it?

Answers:    Defiantly lack of calcium is the most common apology. The above suggestions work well, for immediate assist I know you can buy liquid calcium supplements that you can mix with marine and just spray your tomato plant with. The entitle of the one I have used is called Nutrical. I'm sure here are other brands as well.
Calcium or the lack of is one raison d`¨ētre. Uneven watering is another. And the uneven watering can actually result in the low calcium level in the plant.

Easy ways to include calcium to your soil are put crushed egg shells around your tomato plants. Or you can add them to your compost. Or you can add a insubstantial sprinkle of garden lime in the spring before you plant.
An serrated balance in the opening the plants are watered. The plants aren't getting enough calcium.you might have to make the addition of that to the soil.
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