Hardy perennial, reaching about 3ft/90cm high with whitish-blue flowers from early to mid summer.
Can tolerate light shade and nutritionally poor soil. Prefers a moist soil. Good green manure - fast growing and helps enrich soil with organic matter. Fixes atmospheric nitrogen.
Is used in modern herbal medicine to help increase milk flow in mothers and treat late-onset diabetes as it contains an alkaloid that reduces blood sugar levels.
Always seek professional advice before using a herb medicinally