Indicator plant A sensitive plant that alerts to some condition such as drought.
Inermis Without thorns or less thorny.
Inorganic Something that was never alive; of human manufacture.
Sometimes the best indicator plants for drought are your trees. Are the leaves browning or falling before autumn? Are the limbs drooping? A simple look up at the branches will help you take notice of any problems.
The delicate perennial Wahlenbergia gracilis was an important indicator plant to the Darawal people, because when it was in flower it was also a time when snakes would become active and a time to teach children to be aware of them.
Because these conditions are not considered in the Plant Hardiness Zone Map, it is recommended that in addition to using the zones as a guide you should also use the USDA's list of 'indicator plants.
Impatiens make a good indicator plant, if you want a signal that it's time to water. They will wilt and drop their blooms and then languish for a week even after you've watered them. But they won't die without a fight.
indexing. Testing a plant for a virus infection, usually by grafting tissue from it onto an indicator plant.
infection. The entry of a pathogen into a host and establishment of the pathogen as a parasite of the host.
Your plants will require frequent watering if the weather has been sunny and warm, and they may not need a drop if the weather has been cool and cloudy. Make a habit of checking the soil of at least a few indicator plants, ...
They will turn yellow before the escaping gas is detected by household members and are sometimes used in greenhouses as indicator plants for excessive ethylene gas resulting from incomplete combustion in gas furnaces.
 See also: Plant, Soil, Water, Flower, Gardener
  
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