Collecting medicinal herbs requires careful attention to ensure the efficacy of the herbs as medicines. Here are some rules for medicinal herbs collection:

1. Correct Identification: The herb must be identified correctly. Good knowledge of all the characters and characteristics of plants is required.

2. Optimum Time of Harvest: The correct time of collecting has to be known. The World Health Organization’s criteria for good herbal drug preparation include the optimum time of harvest.

3. Post-Harvest Handling: After harvesting, the herbs need to be handled properly.

4. Drying and Preservation: The correct way of drying and keeping the herb is crucial. The herbs should be stored in a way that preserves their medicinal properties.

5. Sustainable Practices: For the restoration, reproduction, and protection of medicinal herbs, do not disassemble the plants, do not tear them with a stem or a STEM, as well as endings.

6. Quality Assurance: Stick to these rules, and you can be sure that the plants you pick will be of the finest quality.

Remember, these rules are general guidelines and the specific practices can vary depending on the particular herb and its traditional uses.