Quote:
Originally Posted by Tom Barr
Sure, these damn weeds:
L pantanal, L cuba, L arcuata
All at high NO3, 30ppm etc
Also note the red color without CO2.
Then look at the lighter color with CO2.
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I've heard that some plants are red not because of anthocyanins, but due to betalains, which contain nitrogen atoms. Maybe L. pantanal, L. cuba and L. arcuata contain betalains, therefore they are red at high NO3?