No. But it can spread aggressively if happily sited. Just pull out what you don't want.

I regret planting ajuga because of this ^^. I am still grubbing it out!

Because of it spreading or because of the phlox?

Once you have ajuga, you will never, ever get rid of it.

If theres a perennial that can hold its own, it it’s phlox…

The ajuga will allow most perennials and bulbs to grow up through it quite easily. But some gardeners do have issues with its spreading nature.......although that is exactly what a good groundcover is intended to do. And you certainly can get rid of it and with not that much difficulty. It is not nearly as aggressive or difficult to remove as something like goutweed!! And even that can be eliminated if determined.

In my heavy clay it is not easily removed, and it is certainly aggresive for me.

I agree with what others have said about the plant. I planted Black Scallop ajuga. Beautiful, yes, very, very aggressive, also yes. By the third year, it was was growing through and around very hosta and perennial I had. I could barely see my garden! AND….it’s not easy to get out because it spreads through underground stolons which then develop a new base head for other shoots to grow. It took me 2-3 years to get it all out and I just have city front yard where I planted it. Think twice!

debra