Harvest herbs on a dry, sunny morning after the dew has evaporated. Pick early, before the sun gets too hot, otherwise the oils will evaporate. Hang stems in small bunches to allow the leaves to dry quickly. Hang in a room that has good air circulation and warmth but not heat, as heat will destroy the oils. Place out of direct sunlight. Once dry, remove the leaves from the stems and store, whole, in airtight containers until you’re ready to make your own herbal blends.
Collect the seeds of herbs in late summer/ early autumn just before they ripen and before the seedpods burst open. The seedpod begins to ripen when it turns from green to brown. Cut stems with seedpods attached and place the heads in a paper bag. Tie the bag closed with string, then hang from the stems in a warm, dry spot with plenty of air circulation. The seedpods will continue to ripen over the next couple of weeks and the seeds will be released into the bag. Store the seeds in an airtight container.