jay, I have a shitload of yarrow around me
that's the beauty of it, these plants grow everywhere!
do I just throw the whole plant, flower stem and all in the water?
yup, its that simple. you can chop it up some but you dont NEED to. it just speeds things up a tiny bit because of more surface area. but like i said you can just toss it all in and wait, stirring up the material every few days with a stick helps some too.
\or should I hang dry it first before using?
hang dry if you want to save some for later, you can dry and store yarrow for up to a year and still use it with good results. just don't leave it in a really hot dry and sunny area.
i store it in a 5 gallon bucket in powder form with the lid on in a shed. enough ferts for a LONG LONG time.
also what does yarrow contain ?
nutrients:Iron, Lime, Potash, Soda, Phosphorus, Sulphur, Nitrates
The primary chemical constituents of Yarrow include essential oil (proazulene, borneol, camphor, cineole, eugenol, linalool, pinene, sabinene, thujone), isovalerianic acid, achillein, formic acid, salicylic acid, polyacetylenes, asparagin, sterols, glycoalkaloid (achhilleine), flavonoids (apigenin, luteolin, rutin, quercitin), coumarins and tannins
hope that answers your questions.