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Indicator Plants

Tom Barr kindly wrote:

"Indicator plants are a good idea to keep an eye on nutient levels.
Riccia is good for CO2,most red stem plants for iron, most hygro's act
weird if things aren't to their liking"

Would some of the more experienced plant grower like to add to this list and
elaborate a bit more ?

I think it would be very useful if we got better at actually watching our
plants more to help spot eg. potential nutrient deficiencies rather than
jumping for the test kits at every opportunity.

Andy Moore  -  andy at ascot_u-net.com

Treasurer/BBb Tuba Player Poulton-le-Fylde Brass Band
and Aquatic Plant/Discus collector