I use Yarrow for pain; it works as an analgesic actually making the skin and area numb. It stems blood flow - if I put my Yarrow oil on my abdomen during menstruation it will cease my period within 1-2hrs and elliminate all cramps and lower back pain when applied to back also.
You may use all parts of the plant, leaving at least 1/3 of your private growth to reseed for following year. If collecting it in the wild - do not take more than 1/10 of what you see. Wild seed can be easily collected off of dry seed heads and scattered at home where you want it to grow. Then it will re-seed itself yearly and increase it's yield in your own
yard.
Caution: do not use if pregnant or breastfeeding. Use caution when collecting it; wear gloves especially if you are using knife to cut it down or dig it up - you may cut your skin and not feel it.
Drink as tea to calm...also helps stomach problems, apply to a cut to stop bleeding as well.
Roots are very strong for use as well (taste peppery) will also aid gastric problems.
Always use caution when using any plants for the first time, everyone responds or reacts differently and there may be allergies present. Start with small exposure to say...wrist area. Check for 24 hrs. If ingesting - do your own research and make sure it is the right thing for you. Start small with weak concoction, then slowly increase as you are assured it is safe for you to do so. My
experience with Yarrow is that is is faily non-reactive but as stated: everyone is different.
It is a beautiful and useful plant, enjoy and
should be a
staple of every natural first aid kit. I hope this helps. T.