It is highly possible Feng Shui exists in Chireiden. You can find this theory in AoCF, a dialogue between AI Futo and Koishi (not AI).
Koishi can use roses. It is canon indeed but how come she has an unlimited supply? It is definitely a magic rose, blooms from her subconscious mind
Chireiden owns a bunch of rose gardens, magical ones. These roses are called Subterranean Roses, bloom from consciousness and subconscious minds of the satoris. They grow healthy and well.
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Touhou Headcanons!
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