Camellia sinensis thrives in acidic soils between pH 4.5 and 6.0 — conditions toxic to most plants. At these pH levels, aluminium becomes soluble and bioavailable. Rather than being harmed, tea plants actively accumulate aluminium, storing it harmlessly in their vacuoles. This unusual tolerance is thought to contribute to the plant's unique mineral profile and its ability to produce stress-response compounds like polyphenols, which directly affect flavour and health properties.
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