If you are pursuing a spiritual or magical alliance with a specific plant, this is best accomplished with a living plant, redolent with power and consciousness, rather than processed, dried plants that retain power but lack conscious intelligence.
You can grow plants necessary for magic spells and/or physical healing. As you nurture the plant - communicate with it: share your fears and desires, let the plant know what you want from it. These plants will potentially provide more power for you than any others. They become your partners in healing and magic. It is a symbiotic relationship: they care for you as you care for them.
In many cases if you want to work with a plant, you'll have to grow it. that's the only way it is guaranteed to be available. The plant realm is as ecologically devastated, if not more so, than the animal kingdom. Many plants are extinct or seriously endangered. The only way to work with some magical plants (Solomon's Seal or Low John the Conqueror, for example), the only way to incorporate them into any spell is to grow and nurture them. It is the only way their power will be available to you.
source: Element Encyclopedia of 5000 Spells
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