Mostly toasted tomato sandwiches and caprese salads!

They look delicious! What are you going to make them into?

yeah but in end blossom rot it's usually that simple

While calcium uptake is the problem, other nutrients might be causing the lack of uptake. Inconsistent watering is also a culprit. Just adding more of a nutrient is not always the answer.

Always toss your egg shells where you plant tomatoes

Was gonna add blossom rot but y'all got it covered

Blossom end rot caused by lack of uptake of calcium. This doesn’t necessarily mean you need to add more calcium to the soil though! It’s largely a watering issue. The plant is getting too much or not enough water and can’t make use of the calcium that may already be present in the soil. Tomatoes want about an inch of water a week and they are moody! Be consistent with your watering. Don’t over do it. Tomatoes will let you know when they feel neglected. There is a product called Rot Stop that is a calcium spray. Apply directly to the plant so it can uptake the calcium it’s not getting naturally.

Some places will say nutrient deficiency (Ca) but mine have done that and the issue was largely solved by more water.

Blossom end rot.

Most commonly this is due to insufficient levels of calcium, which can be caused by too little available calcium in the soil, pH of the soil being out of range, or too much of other competing ions on the soil, amongst other issues.

Most often, this can be fixed with the addition of a little lime (i.e. calcium powder lime, not the fruit) added to the soil. Will take about 2 - 3 weeks to resolve if that's the issue.

Tomato end blossom rot. Add calcium.