If you gather the herbs at the right moment, they can unfold their power a lot better. The drying is easier and they will not mold.
If you plan to use the seeds immediately, it is recommended to use a waxing moon. Also quite beneficial are fruit days (Aries, Leo, Sagittarius).
Additionally, when gathering herbs for a specific body part, you can use the days where the moon is in the corresponding Zodiac sign. For example, you can produce a good foot cream when you gather the herbs on a Pisces day.