Collecting Seed


I would like to collect seed from some Open-pollinate and Heirloom
varieties. I've read that Broccoli, Brussels Sprouts, Cabbage, and
Cauliflower will cross-pollinate with each other.  

Will they cross even if some are hybrids ?  

Can I grow them at different times in the same year and have them not
cross ?  As their ''fruit'' is the flower, can that be done ?

Sincerely,       
~Carleen~
Keeper of Sheep & Old Roses
Rainier, OR  zone 8  



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