Nasturtium
Tropaeolum majus
Most useful here as an edible, pungent garden plant rather than something that needs to become a concentrated tincture. Leaves and flowers contain pungent mustard-oil-related compounds; young green seed pods are traditionally pickled as “poor man’s capers” (use a tested pickling recipe rather than improvising proportions for shelf-stable canning — refrigerator pickles are the simpler home option).
Antimicrobial — Helps inhibit microbes
Expectorant — Helps loosen and move mucus from the lungs and chest
Growing and using it
Tender annual.
Straight or traditional single-flowered garden nasturtium (Tropaeolum majus) seed.
Direct sow seed.
Direct sow after frost when soil has warmed. It can be started indoors a few weeks earlier in individual pots to minimize root disturbance.