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I've got a mystery heirloom tomato plant growing in a 5gal grow bag outside. Zone 7a Canada, in the Essex county area. I've noticed brown dots starting to form on almost all the tomatoes that are growing. I've checked Google images to try and compare but I've only seen one pic that looks somewhat close to my issue.

Potted with a mix of 4 soils; miracle grow regular enhanced soil, PC Organics vegetable and herb soil mix, ProMix, and one other that I cannot remember, the bag was a deep blue colour that stated it was enhanced to provide nutrients for up to 6 months.

Now I know I should have used bonemeal to prevent this current issue, but I'm unsure if this is actually blossom end rot.

Every 2 weeks I feed everything miracle grow'quick start' liquid fertilizer 4-12-4 because that's all I have. There's also slow release fertilizer pellets in the soil from me mixing it into my soil when potting. They stand in full sun to part sun. Humid summer so far with little relief all of July.enter image description here

This same issue is now happening to my Brandywine heirlooms too...enter image description here

Alex J
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Nope; blossom end rot is black and, well, rotten. If I had to guess, I'd say your problem is caused by over-fertilization/incorrect fertilization. Of course, with tomatoes, it could be one of seemingly a million other things...

Jurp
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