We've tied our plants using fishing line; it's inconspicuous and strong. Put up a few stakes and tie the line in a few rows across the front of the plants and that should keep them standing.
Yarrow does best on dry sites in full sun. Yarrow will grow taller if grown in partial shade or soggy soil, which makes them tend to fall over. Wind can also cause them to fall. In such cases they need to be staked and tied.
Alternatively you can support them with tomato cages but the problem is tomato cages look like tomato cages. You can get a plant support that is green and not as obvious, there are different shapes and sizes. Here is a picture of a round support. http://www.plantsupports.org/plant-support/double-plant-support-ring.html
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Request: Yellow Yarrow Grew Too Tall (06/29/2009)
I have yellow Yarrow in my front yard. It has done well, but grew so high this summer that it fell over and didn't look nice at all.
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Request: Yellow Yarrow Grew Too Tall
Archived on 06/29/2009
I have yellow Yarrow in my front yard. It has done well, but grew so high this summer that it fell over and didn't look nice at all! It is only in its 2nd year and I wondered if there is anything I can do to keep the height down, so it can hold itself up and look nice in my flower bed.
Hardiness Zone: 5b
Julie from Northeast, PA
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RE: Yellow Yarrow Grew Too Tall
Hi Julie, I live in NE PA too. I also have that problem with my yellow Yarrow. I think its because the soil is too rich where I have it planted. Yarrow will grow in poor soil. So if you want it to be short, plant it where nutrients are depleted. I made the mistake of planting mine in amended soil. I should have left it as clay.
Warm regards from Wyoming, PA (09/19/2008)
By Carol in PA
RE: Yellow Yarrow Grew Too Tall
Mine gets very tall too. When it starts to grow in the spring I put a tomato cage around it it works great. You might want to try this. (09/23/2008)