"When different varieties agastache are grown together they may cross-pollinate and may not produce seeds/seedlings true to the parent plant" UC.edu

It's not an issue. I was just curious about it. I know from experience peppers do & so will cantaloupes & cucumbers. the main thing is the bees like them both & work them pretty hard. my local Lowes got the black adder a couple of weeks ago. they also got a different type of Russian sage in another favorite of the bees. they just marked both down to $1.00 so I bought bunch of each.