Herbal tea against blood pressure

I have just read a short article in a German magazine “Natur&Heilen” that the university of California found out that a herbal mixture of Lavender (lavandula augustifolia), Fennel seeds (foeniculi fructose) and Chamomile (Matricaria chamomile) effectively lowers blood pressure.

this is what I really like - that science confirms the usage of natural sources.

I used this information to do some google search and found an article which I copied down below in English.

“The scientists tested 10 different herbs known to lower blood pressure to see if they activated the KCNQ5 gene, which is a potassium channel expressed in the smooth muscles surrounding blood vessels.