Black bum tomatoes


Tuesday 28 July, 2015 by Uncle Spike


Ok so here’s a strange one for ya… black bum tomatoes!

This weird phenomenon is actually very common for us on larger fruit tomato plants. The small cherry tomatoes are never affected, just the bigg’uns. You’ll find them growing like that on even the most healthiest looking of plants too…

But the cause is siöpğle, and also easy to remedy. It’s basically a lack of calcium in that particular fruit. It’s not a disease, not fungal related or even caused by an insect; just a lack of calcium. That happens here mostly as the soil is very stony and even after adding some mulch, the ground dries so quickly in the summer sun, and during that process, the plant cannot get enough calcium up to its fruit.

The solution? Simple. I used to water the tomatoes at the same time as the peppers, aubergines, okra and other summer crops. Basically too much, too infrequently. I now water less, and more regularly, and the results are immediately better…




13 thoughts on “Black bum tomatoes

  1. NinnaO says:

    How interesting! I knew there often is less of minerals etc in crops nowadays due to less nutrition in the soil, becaus of the modern ways of growing things. But I didn’t know it could be such a shortage that it would be seen on/in the fruit! But of course! It’s logical, really! If you just come to realize that! Shortage of one, or several, minerals doesn’t only can occur in us people! I, for example, discovered some time ago I had a shortage of Magnesium. It did NOT feel good, and I’m still not fully recovered.
    But the same treatment is required! Add what is lacking and don’t let it go the fastest way out again!
    I wish you a wonderful day!

    Liked by 1 person

  2. ssgt leslie says:

    Trail and error. Good you were able to correct the defiencency in your crop.

    Liked by 1 person

  3. Dragnfli says:

    In the U.S., it’s called blossom end rot. I like black bum much better.

    Liked by 2 people

  4. Joanne says:

    Perfect timing – my roma tomatoes have begun suffering this and wondered what was going on – now I know! 😉

    Liked by 1 person

  5. dayphoto says:

    Yep, just what I thought!

    And being the outstanding farmer, you are, you knew exactly what to do!



  6. That is really interesting Spike .. especially that it is a calcium deficiency.

    Liked by 1 person

  7. Yvonne says:

    Good, I’m glad you can cure the black bums on your tomatoes! And now, I know what ailed mine a few years ago.

    Liked by 1 person

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