Brown splotches on older leaves can be a common symptom of fluoride toxicity. This issue is frequently seen in indoor houseplants like corn plants and spider plants (monocot family) that have been Just wanted to show of my rare black ZZ plant! Share your rare house plants in the comments! exBEERiment Sugar Additions: Coconut Sugar vs. Sucrose In An International Pale Lager Brlosophy Types of houseplant bugs: Who they are and what to do about them