The bright orange, red, and yellow garden flower with a surprising peppery, watercress-like bite. Both flower and leaf are eaten raw, and the plant has a real folk and scientific reputation as an antimicrobial — a 'natural antibiotic' for colds and urinary infections.
Nasturtium is one of the easiest plants to grow — it thrives in poor soil, climbs or sprawls, and gives flowers, leaves, and seed pods all edible. A free, vitamin-C-rich, peppery garden food with real antimicrobial value, it's an accessible piece of grow-your-own medicine.
Nasturtium is one of the few edible flowers with a genuine antimicrobial pedigree. Its peppery bite comes from glucosinolates that release benzyl isothiocyanate (a mustard oil) when the tissue is broken — the same class of compounds that give horseradish and watercress their kick, with documented antibacterial, antiviral, and antifungal action. In Germany, an herbal medicine combining nasturtium with horseradish root is an approved treatment for urinary and respiratory tract infections, with clinical trials showing it can reduce recurrent UTIs and acute sinus and bronchial infections — real evidence, not just folklore. The flowers and leaves are also high in vitamin C (historically eaten to prevent scurvy) and carry lutein and carotenoids. Honest framing: nasturtium's antimicrobial action is well-documented and the German respiratory/urinary evidence is solid for the standardized preparation; eating the flowers and leaves gives a milder version of the same benefit plus a vitamin-C-rich, free garden food. Not a replacement for antibiotics in a serious infection.
Eat the flowers and young leaves raw — they're best fresh, where the peppery mustard oils are strongest (cooking destroys them). Toss flowers into salads for color and bite, stuff the blossoms with herbed cheese, chop leaves into a peppery pesto, or use the flowers as an edible garnish. The green seed pods can be pickled as a caper substitute (see capers). For a cold or to support the urinary tract, eat the fresh leaves and flowers raw and regularly.
Free, no account needed to ask.