Alliums (including onions, leek and chives) contain allicin which is release as part of the plants. It is an anti-bacterial and has been found to protect the heart from diabetes induced cardiomyopathy.
A bulbous flowering plant
Best planted annually in late autumn. Straight into prepared ground, one clove will give 1 bulb the following summer. Plant each clove at a depth of 2cm (1″) below the surface of the soil and 10cm (4″) apart.