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…