My office has recently developed a fungus gnat problem. Since I'm the one who pleaded to replace the dusty fake plants with real ones, everyone is now glaring at me to find a solution
The plants are all mature: snake plants, poytail palms, dracaena, arboricola schefflera. The cinnamon will not likely be touching the plants, but will inevitably get on the roots when applying to the soil... will this burn the plant? I've already read that cinnamon can be used as a substitute root hormone so I was surprised to read about the plants being burnt, but this may only apply to stems and leaves...?
I'm going to put some dishes of soapy water out today, but am confused by all of the mixed reviews and information I found online regarding soil solutions. I found some suggestions of diatomaceous earth, obviously the cinnamon recommended here, hydrogen peroxide (although I'm worried about stripping the soil of good bacteria), and neem oil. Any suggestions for what would be best for large tropical plants in an office?
We've had the plants for years and this is the first time we've had a gnat problem. It could be due to some fresh soil I recently replaced on the top layer and also because I had been underwatering and may have overcompensated by now watering too much