"Black Tea" stems or prevents shedding
"(Stinging) Nettle Tea" is good for itchy scalp, dermatitis, and is thought to be a hair growth aid.
"Horsetail/Shavegrass Tea" promotes healthy skin and strenghtens hair root and follicles.
Do a google check on the type of tea you want to use and see if it is beneficial for hair or scalp health.