Asked August 19, 2018, 4:10 PM EDT

We planted 5 varieties of tomatoes this year. This San Marzano variety has this odd black/brown spot on the bottom. We had on issues with this variety last year. What causes this?

Clackamas County Oregon horticulture tomatoes vegetable gardening

1 Response

Thank you for your question. Your tomatoes are suffering from blossom end rot, whose definition and cure is explained here: