I am trying to figure out why yarrow would die in zone 9.... it is deciduous, sometimes, dying BACK. Does it get too much water in the summer?
My second thing is, maybe the poor boy needs to get his teeth pulled?
After all of this, I don't have any fresh yarrow... but you can buy it easily.

clotilde, let's email privately. I have plenty of dried yarrow harvested from my meadow. Have you also considered oil of clove diluted in olive oil and applied to the wisdom teeth? Or spilanthes?

spilanthes makes a lot of spit! :o)

I think our summers are too hot for yarrow. There are a lot of prairie and eastern plants that come in here and manage for a while, but the heat gets them after a while. It also rains a lot on occasion, and that does more of them in.

Thanks to both of you for the help. JM

You might be able to grow it in a pot. I don't think it's the heat, cuz it takes my 110º and above just fine. It might be too much water. If it was in a pot, you could bring it in during a rain... I water mine maybe once or twice a week at that heat. I am hoping that you can grow it. It's a weed here in our hot dry summers.

Might I make a suggestion, if it is a tooth breaking through and you can get some root of the common Mallow and chew on that it may be helpfull (it works for teething babies.

I have Yarrow and several others from your wish list. In need of Elderberries, drop me a line please. Thanks, Lynn

oh! how about clove oil? or just putting a clove where the tooth is erupting?