Blossom End Rot. It's brought about by plant stress. It's the result of the plant being unable to distribute sufficient calcium to its fruit via its internal mechanisms.
Many many things can stress a plant. Irregular watering patterns are often cited as the cause. They could be the cause if the watering patterns are irregular but there may be other factors too. Fluctuating temperatures, overwatering, underwatering, sudden strong winds if the plant is outside, any or all of these could stress a plant.
Plus some varieties - the plum shapes, San Marzano and Roma, etc - are very prone to the problem. No one knows why. But yours isn't a plum shape.
Blossom End Rot is one of the more perplexing problems for the home tomato grower. As often as not, the cause cannot be identified.
No, Epsom Salts won't help. As was discussed in another thread recently, ES will provide magnesium, only useful if the soil is deficient, which is highly unlikely. Excess magnesium can actually compromise the availability of calcium.
Pondman01
Posts: 73
Posts
https://forum.gardenersworld.com/discussion/1015844/blossom-end-rot/p1
Hopefully @Italophile will see this and have some suggestions.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
It's a cultural problem, not a disease ... but some varieties are more prone than others and this weather isn't helping.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Many many things can stress a plant. Irregular watering patterns are often cited as the cause. They could be the cause if the watering patterns are irregular but there may be other factors too. Fluctuating temperatures, overwatering, underwatering, sudden strong winds if the plant is outside, any or all of these could stress a plant.
Plus some varieties - the plum shapes, San Marzano and Roma, etc - are very prone to the problem. No one knows why. But yours isn't a plum shape.
Blossom End Rot is one of the more perplexing problems for the home tomato grower. As often as not, the cause cannot be identified.
Where are the plants? Indoors or outdoors?