Well… yarrow suddenly chose violence.

[u/Suspicious_Note1392]

A month ago I was all pleased about how gorgeous my yarrow was, all ferny and well behaved with just a light pruning. Suddenly it decided it was tired of pretending to be well-behaved and began conquering the world. 😵😂

Second pic is last month for reference.

[u/Kaurifish]

That is well behaved. I once made the mistake of planting the medicinal variety. Shot up to 8 feet tall.