Collect Herbs in clear, dry weather & in the morning , after the dew has disappeared.
- Leaves
Gather the leaves as soon as fully matured, just before the flowers appear, just before they fade, or at the maturing of the fruit. (Biennials do not perfect their leaves until the second year.)
- Stems
Cut herbaceous stems after the foliage appears, but before the blossoms develop. Cut ligneous (woody) stems in the autumn, after the foliaga falls.
image source - Stalks - Collect stalks in the autumn
image source - Twigs - Collect twigs in the autumn
image source - Bulbs - Gather bulbs after the new bulb is developed, just before the leaves decay.
image source
Source: Natural Remedies Encyclopedia Heritage Edition