I have approximately 7 years collecting Bonsai, although it does not seem, they require a lot of care and attention, then I present them, an example planted with seed, it is between tree and shrub, native of Africa! Known as Acacia Caven / aroma or espinillo.
Another characteristic of this species, is that when feeling threatened, by some, predator, it sends a signal to its same species around and releases a substance, not pleasant for its predators.
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From @edontheroad