What Is Causing A Black Mold-like Substance In Tomatoes That Look Perfect On The Outside?

Question

These are San Marzano tomatoes with plants that appear robust and many fruit. I have harvested only a few pounds, but have many green tomatoes. Two that I just cut open have a black mold-like substance on the seeds and flesh at the blossom end. What is causing this and can it be corrected?

Answer 1

This sounds like Blossom End Rot! Ultimately, this is related to a calcium deficiency, but there are many reasons for this to happen. Here is an article that will help:

https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm

This article will help you to grow tomatoes to their potential:

https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm

This link will take you to a free ebook that you can download on the subject of tomatoes:

https://blog.gardeningknowhow.com/ebooks/essential-guide-to-growing-tomatoes/