According to Feng Shui, cactus and similar thorny plants (except roses) should never be kept at home as they exude negative energies.
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Bonsai
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Bonsai plants are undoubtedly beautiful but shouldn't be brought home.
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English ivy
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English ivy is gorgeous, especially when it comes to decorating bookshelves and other indoor spaces. But are they worthy of being kept at home? Long story short, no.
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Tamarind
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Tamarind is a rich source of antioxidants but the tree is said to invite illnesses when kept in home gardens.