Stress can spike BP due to the higher cortisol level that narrows arteries.

But baseline BP is all about diet, exercise, good sleep routine and avoiding smoking.

Some foods like licorice can elevate BP; the glycyrrhizic acid inhibits an enzyme that deactivates cortisol.

I personally drink hibiscus tea a few times a week which is an ACE inhibitor and is shown to reduce systolic blood pressure by 5-7mmHg. Also the occasional beetroot juice (+ apple and carrot) or magnesium bisglycinate for a 2-5mmHh systolic reduction due to the nitric oxide.