We may describe the process thus: In all these structures, the Spiritual has become physical. There it is living in the body astrally, there it is living in its image, as the Spirit or the Ego — living in a physical way as Spirit transmuted into the physical. After a time, however, it no longer feels comfortable there. It wants to dissolve again. And now once more — moistening itself with sulphur — it needs a substance wherein it can take its leave of all structure and definition, and find its way outward into the undefined chaos of the universal All, where there is nothing more of this organisation or that. (Steiner 2007:26)
One would fain say, “In no other plant do the Nature-spirits attain such perfection in the use of sulphur as they do in yarrow.” And if you also know of the working of yarrow in the animal or human organism —if you know how well it can make good all that is due to weaknesses of the astral body (provided it is rightly carried into the biological sphere) — then you will trace it still farther, in its yarrow-nature, throughout the entire process of plant growth. Yarrow is always the greatest boon, wherever it grows wild in the country — at the edges of the fields or roads, where cereals or potatoes or any other crops are growing. It should on no account be weeded out. (Needless to say, we should prevent it from settling where it becomes a nuisance — it may become a nuisance, though it is never actually harmful). (Steiner 2007:44)
Here again the members of our Agricultural Circle should make experiments; they will soon see how well it works. And now the question is (for we should always work with insight, not with lack of insight), the question is: As to the yarrow, we have learned to know it. Its homoeopathic sulphur-content, combined in a truly model way with potash, not only works magnificently in the plant itself, but enables the yarrow to ray out its influences to a greater distance and through Large masses. But the question remains: Why should we sew it up precisely in the bladder of a stag (Steiner 2007:45)
Here we must gain an insight into the whole process that is connected with the bladder. The stag is an animal most intimately related, not so much to the Earth but to the Earth’s environment, i.e. to the Cosmic in the Earth’s environment. Therefore the stag has antlers, the functions of which I explained yesterday. Now that which is present in the yarrow is intensely preserved, both in the human and in the animal organism, by the process which takes place between the kidneys and the bladder. Moreover, this process itself is dependent on the substantial nature or consistency of the bladder. Thus, in the bladder of the stag — however thin it is in substance — we have the necessary forces. Unlike the former instance (the cow, which is quite different), these forces are not connected with the interior. The bladder of the stag is connected rather with the forces of the Cosmos. Nay, it is almost an image of the Cosmos. We thereby give the yarrow the power quite essentially to enhance the forces it already possesses, to combine the sulphur with the other substances. (Steiner 2007:45)
STEINER, Rudolf. 2007. The Agriculture Course. (Trans.: George Adams) Shrewsbury: Wilding & Son Ltd.