Akasha is the element of the gods/goddesses. Therefore, there are no assigned herbs for this element. You should research your particular choice of pantheon to determine what herbs are appropriate to use in association with your dieties. This element is the element of Magick itself, and should be as well researched and well supplied as the spell components themselves.

Akasha is the "fifth" element, and its stones are usually of organic origin, such as substances from living creatures or fossils of long-deceased animals and plants. They are useful in a variety of magickal applications, including longevity and past-life regression. These stones include, but are not limited to...

amber, coral, fossils, jet, mother-of-pearl and petrified wood.