Why does Sandalwood need a host tree?

host sandalwood tree
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Why does Sandalwood need a host tree?

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A. Sandalwood trees are root hemi-parasites and require host trees for healthy growth. The host trees provide extra water and nutrients to the sandalwood delivered by a unique root connection called haustoria. The two trees form a symbiotic relationship throughout the life of the sandalwood tree. The best host species are the nitrogen-fixing plants, especially the wattles (Acacias) which are also native to Western Australia.

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