Many herbal blood pressure treatments combine a mixture of compounds.
One that I like is called Alistrol - it has a mixture of different potent herbs - including holly leaf extract which has been shown to lower blood pressure levels in different situations.
Alistrol contains holly leaf extract, Daikon seed extract, premium hawthorn berry and garlic extract. It's been tested in a medical scientific trial and shown to reduce blood pressure levels significantly.
You can find out more about it here.