Cross pollination ?

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I have some brassicas that have bolted and started flowering. They are growing in the same bed/close to each other.
These brassicas are Napa cabbage "Granat" , Pak Choi "Canton Chinese" and Pak Choi "Thai white"
Will they cross pollinate or are they likely to pollinate themselves immediately upon opening (by wind, gravity etc) ?
 
Joined
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I think they are all Brassica Rapa, which means they will cross-pollinate. Sorry.

If you keep the flowers of all of them except one cut off before they flower you can save that one. But if the pollinators get a chance you are sunk.
Thanks, I think I'll do that.
But what might happen is that some of my plants which haven't bolted yet will bolt by the time others are finished/finishing.
I will remove remaining flowers ,if there are any, of the ones that are finished (1 of the 3) and allow the late bolters to flower (different 1 of the 3)- thus preventing cross pollination.

It's amazing to see the diversity within one species of plant, blows my mind
 

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