Spider mites and the webbing I found by accident
Okay. So we've done water, we've done crust, we've done light, we've done checking the undersides of your leaves like it's a hobby. New topic. Let's talk about what you're actually looking for down there.
Spider mites.
I found mine by accident. Morning light was coming in low and hit my calathea at some angle it doesn't usually hit it, and I saw this fine webbing between the stems, like the plant had been visited by the world's smallest, laziest spider overnight. I got right up close and it wasn't one web, it was a bunch of tiny ones, and the leaves underneath had this dusty stippled look, like someone had taken a pin and scratched little pale dots all over them.
I felt genuinely betrayed. This plant looked fine from three feet away. Fine from across the room. It was only up close, underside, weird light, that I caught it.
That's the thing about spider mites. They're not a "notice from the doorway" problem. They're a "get your face six inches from the leaf" problem.
What you're actually looking for
- Fine webbing, usually where a leaf meets the stem, or between leaves that are close together. Not always obvious. Sometimes it's two or three strands, that's it.
- Stippling on the leaf — tiny pale or yellow dots, like the green's been scratched away in pinpricks. Underside of the leaf usually looks worse than the top.
- A dusty, dry look to the leaf overall, almost like it needs a wipe down.
- If you've got a hand lens or even just good eyesight and patience, you might see the mites themselves. They're tiny, reddish or pale, and they move slow. Most people never actually spot the bug. They spot the damage first.
Spider mites love it dry. Which, hello, that's our whole climate out here. Dry air, dry soil corners, heater vents running half the year. They are built for exactly the conditions Utah houses provide. So this isn't a rare, unlucky thing. It's common, and it's more common in winter when the furnace is going.
What to do if you find it
First, don't panic and throw the plant away. I know that's the instinct. Most of the time you can save it.
- Isolate the plant. Move it away from your other plants immediately. Mites walk, and they will absolutely relocate to the plant next door given the chance.
- Rinse it off. Take it to a sink or shower and rinse the leaves, top and bottom, with lukewarm water. This physically knocks a lot of them off. Sounds too simple to work. Works anyway.
- Wipe down the leaves with a damp cloth or paper towel afterward, especially the undersides, where they cluster.
- Treat it — insecticidal soap or neem oil, follow the bottle, usually every week or so for a few weeks because you're trying to catch new generations, not just the ones you can see. Do this away from your good furniture, it can stain.
- Keep checking. This is where the habit of turning leaves over pays off. Once a week for the next month, minimum.
A real caution here: don't reach for something stronger than you need just because you're mad at the bug. I get it, I was mad too. But a strong chemical treatment indoors, around kids or pets, is its own problem. Read the label, use it in a ventilated spot, and don't improvise mixtures you found in a comment section somewhere.
Why this ties back to the room you keep the plant in
This is where I'll say the opinion again because it fits here too: light is the thing nobody measures and everybody guesses wrong, and dry corners near heat vents are usually also the dim, forgotten corners of a house. Mites show up where a plant is already stressed. A plant that's getting good light, reasonable humidity, and isn't parked directly under a heater duct is a much harder target.
Which brings me to Jeremiah's fiddle-leaf fig. He got me one for my birthday, the big trendy one everyone wants, gorgeous glossy leaves, and I was thrilled for about three weeks. Then it started dropping leaves. Not spider mites, as it turned out, just general fiddle-leaf drama, they do that at the slightest change in light or draft. But I remember standing there checking every leaf for pests because surely something was attacking it, and no, it was just being a fiddle-leaf fig, which is what they do. I was mad about that plant for way longer than I'll admit to. That's part of why I tell people to skip them. Great look, rough plant, and if something even mildly stressful happens to it — like, say, a mite outbreak — it'll drop leaves out of spite on top of everything else. There are ten easier plants that look just as good on your shelf.
Point is, a stressed plant attracts trouble. Fix the conditions and you're fighting fewer fires to begin with.
Before next time: pick two plants tonight, get right up close, and check the undersides of the leaves. Takes two minutes. If you see webbing, don't panic, just isolate it and come tell me what it looked like.