A Druid's Handbook to the Spiritual Power of Plants: Spagyrics in Magical and Sexual Rituals - Jon G. Hughes 2014

Conservation Issues
The Principles of Arriving at the Complex and the Incense
Alchemy: Its Relationship to the Druidic Tradition

Most of the plants we shall be using are common to all the northern European countries where the Celtic races are found. (This is why they have their place within the Druidic tradition.) Many of the plant materials used in the wide range of schools of alchemy vary significantly from those found in the Celtic nations, due mainly to their very differing climates and natural history. There are, however, many similarities to be found.

Depending on where you live, you may have to vary the materials to suit your own natural resources. I have deliberately selected two very common plants to illustrate the complex refinement processes, both of which may be harvested in most areas without undue stress on the environment. However, should you decide to use other plants for your initial experimentation, or widen the range of plants you use as your skills develop, make sure that they are an abundant, renewable resource within the areas from which you harvest them. Never harvest plants you know or suspect to be classified as endangered species. Remember that as Druids we are striving at all times to be in harmony with nature; therefore, we should harvest only what we are confident that nature can restore without difficulty. If in any doubt about the classification of a plant you intend to harvest, contact your local conservation organization.