The arum is an unusual plant for your garden but its dried rootstock is valued for bronchitis, asthma and COPD (chronic obstructive pulmonary disease) which involves chronic congestion which blocks your air passages. The plant is otherwise poisonous, flowers. leaves, fresh root. The root stock needs to be thoroughly dried or cooked before use, then mixed with honey for internal use. There are literally hundreds of arums, some of them producing the largest flowers in the world. The arum shown below is what I have in my garden and it is both distinctive and attractive and grows to 8″ to 10″ tall.