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Clearing up the confusion on Brassica Cross pollination

 
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https://www.redwoodseeds.net/blogs/the-story-of-seed/14200361-brassica-basics-seed-saving-101

"What is going to seed in our garden now? We have Red Winter Kale (B. napus), Collards (B. oleraceae), Pak Choy(B. rapa) and Giant Red Mustard(B. juncea) all going to seed. They all have the same genus but different species so there will be no cross pollination. Easy!"
 
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Amit Enventres wrote:https://www.redwoodseeds.net/blogs/the-story-of-seed/14200361-brassica-basics-seed-saving-101

"What is going to seed in our garden now? We have Red Winter Kale (B. napus), Collards (B. oleraceae), Pak Choy(B. rapa) and Giant Red Mustard(B. juncea) all going to seed. They all have the same genus but different species so there will be no cross pollination. Easy!"



They can actually cross. I have had radishes and mustard cross in the garden before. I now plant them staggered so they won't bloom at the same time. In fact, crossing brassicæ is so easy that new species are coming to market all the time. One that comes to mind is misome, which is a cross between komatsuna and tatsoi. In Asia, there are hundreds of varieties of brassicæ which have mixed ancestry.
 
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The brassicas are complicated. A wikipedia article details the relationships and crossability among common brassica species. Here's the image from that article.
Brassicas-Triangle_of_U_1.PNG
[Thumbnail for Brassicas-Triangle_of_U_1.PNG]
Brassicas: Triangle of U
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