I went to check on one small pot of mint which I’d added the sugar to.
I noticed potential red spider mites coming back to infect some other mints. But this particular one is still clean.
However, one can smell a very slight pungent smell from the soil, if I hold the pot close to my nose. I suspect it’s the sugar feeding the bacteria which is producing some stuff. It’s a very slight smell, and I’m not bothered about it.
Now, to observe some more…
Edited to say:
I went to check on my sawtooth coriander, since the leaves are large enough for thorough examination (I’ve decided to use this for a more proper test), and it’s placed away from my mints so that I can check on my area for mites as well.
Despite having had sugar placed in its soil a few days ago, I’ve observed no good effects on the plant, since I saw today that it got re-infected with A LOT of spider mites.
I have two guesses:
1. The sugar got washed away from my daily top-watering;
2. The sugar has no effect.
Suspecting #1, I’ve filled the pot with four spoonfuls of sugar again. We’ll see.