Growing Multiple Colors of Bee Balm

I have a well established patch of pink bee balm (Monarda) and wanted to add some other colors of beebalm to grow among them. Will they cross pollinate and all end up the same color? Should I keep the colors separate?

Cross pollination and the vigor of the pink bee balm (Monarda) can often convert a multi-colored planting into a monochrome (pink) garden. Weeding out the seedlings will help reduce the problem of the offspring taking over the bed. This will help even if you plant the different color bee balms in separate beds. Many cultivars do not come true from seed resulting in offspring that look different than the hybrids you purchased. And these youthful sprouts can often out-grow their elders. 

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