I would cut it back. These babies are hard to kill! I moved mine from a flower bed where they were being killed with kindness to the back of our fence which is a desert. At first I thought they were dead so I cut them back and watered them like whenever I thought about it. Which was maybe twice a month. That was last year. This morning I went out to check them out and they all have flowers. I think yours will be fine.

Kate

I pulled it all out of my perennial bed and transplanted a few sprigs in a hot dry spot. I didn't hold out hope for them for awhile but in 2 months time, they were full size bushes from a single little tuft. I hate the stuff. I ended up pulling that all out too. The only way it will die is too pull out all the roots and dispose of them. Any even left on the ground will regrow and choke out any other living thing. It even invaded my lawn.

That really depends on where you grow yarrow. Here in the NE, not invasive at all and it can actually be hard to keep alive. I've had a problem doing just that.

It will be just fine...you will need to trim it down, though...

It will send up new stems in no time...

The best time to move them is when they are still only a couple inches tall (for future reference).

Invasiveness of yarrow also depends on the variety. The A. millefolium types do spread by underground roots, but A. 'Moonshine' for example, does not and needs to be divided every few years so the plants don't get too woody.

Thanks for all the helpful comments! We've been getting quite a bit of rain the past couple of days and it looks like it's springing back and the growth actually is loaded with flower buds all of a sudden. I guess all the sun last week baked it a bit. It now looks sort of like a bowl with the outside blooming stems curling in. There's a sprig or two coming up from the middle. Not sure I want to cut it back now with the flowers...?

The flowers are a fabulous pastel combination and it blooms all season so I think it's a great perennial and it provides an airy feel to a garden. I do see now how it can spread - since of all the perennials I've planted last year it's spread the most. But it just seems like a little digging and pruning every year can keep things under control no?