Broccoli and cabbage leaves turning purple


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I planted in some broccoli and cabbage about three weeks ago and I've seen very little growth, and purple leaves. I planted a bunch of other stuff as well and it's all doing well. Also new growth seems to be good looking. I was worried that it was a watering issue so I turned the watering down to twice a week. What is wrong with my broccoli and cabbage?
 
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It is probably a nutrient deficiency, either calcium or phosphorus. Most soils naturally have plenty of calcium but it is tied up and the plant cannot uptake. I would try epsom salts as it somehow enables a plant to uptake tied up calcium. If that doesn't work fertilize with a good organic fertilizer. Change will not be fast.
 
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Here I would think that purple leaves were a sign of cold weather - lots of plants in my garden have purple leaves in the winter. As well as that, I would never expect to see a spurt in growth on anything at all in the middle of winter - that usually happens when the sun comes out in the springtime.

By the way Sir.... welcome to the forum
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pH could be the problem, as brassicas like neutral to slightly alkaline soil.
If your soil pH is too acidic for them, it would explain why other plants are thriving.
Give them a small handful of lime around the stem.
This will not only see to any calcium deficiency, but will keep slugs/snails off as they hate lime.
 
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