Southern Ontario, Canada. It has been crazy hot and humid - 33C plus humidity.
Do we need more water? Less? This is happening to about 1/3 of the tomatoes and they are not resting on the ground.
Edit: thanks everyone. She's going to start with a bit of lime and some more attention to how much she's watering.
She may even create a lemmy account now that she's seen how many helpful fellow gardeners around here, so win-win!
Thanks again
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.
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.
Tomato end blossom rot. Add calcium.
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