I second @Sunny2‘s suggestion—meditation and visualization has been known to help alleviate elevated blood pressure.
Here’s a program about it.
I’ve used a visualization where I imagine cold water on my head (I’m not explaining it as elegantly as the therapist that provided it to me…but I’ve seen it work a bit for me firsthand)..
That said, you can visualize and lower your BP..but as soon as you return to normal life (e.g. get behind the wheel of a car, go back to your desk at work, etc.) your elevated BP is going to come right back, too.
Foods/drinks with a diuretic effect do not improve hypertension per se – the pill that people think of as being a diuretic (often referred to as a “water pill”) is actually hydrochlorothiazide – which actually causes your body to eliminate more salts—not exactly the same sort of diuretic like those found in coffee or tea, for example.
Also, for some people (like me) hydrochlorothiazide does nothing at all to lower their blood pressure. It depends very much on the root cause of your hypertension. I found out that I shared abnormal heart rhythms, AF (atrial fibrillation) and high blood pressure that could only be controlled with beta-adrenergic blocking agents – same as my grandma, dad and aunts & uncles. (everyone on my dad’s side of the family, essentially).
So..I could do all the visualization, breathing exercises, be cardiovascularly super fit and at a perfectly normal weight & BMI, and still have high blood pressure. Even taking a quite high dosage of hydrochlorothiazide and eating a low-sodium diet had absolutely zero effect on my BP. (In fact, that pretty much sums up my life from age 18 to 38…never had a normal BP no matter what..and that was when I was 5’5” and all of 105lbs, exercised frequently and was a vegetarian for nearly a decade..I still had an abnormal heart rhythm, still had high BP..)
All that lengthy story to just say.. I think figuring out the root cause of your elevated blood pressure is most important. Nothing was going to work for me except a particular dosage of a particular beta blocker. So..you can try naturopathic, meditation/visualization and diet changes…but if and when this doesn’t consistently resolve your BP..you might need a medical professional to help you figure out the bigger picture.