Another week has passed, and she is looking better. She is tiny, though, so there's a genuine possibility she will be stunted. But then, I've been surprised by tiny plants before, so I'll let her go for a while longer before deciding whether to keep her.
The nematodes arrived two days ago, and I applied about a million. As they said in Fear and Loathing in Las Vegas, anything worth doing is worth overdoing.
I'll do a second application to deal with any stragglers in a week or two.
In the tent, I've also deployed three Pinguicula vulgaris, a carnivorous plant. One of them does its job exceptionally well. It's always nice to work with professionals.
Switched out the overly manly sticky traps to better gauge population change.
It's fucking GO! time.
DIE GNATS!!!
Finally, I added mulch to the planter. It's long overdue, but hey, better late than never.
Now, we'll wait and see if she can beat the odds...
@Biotabs, It sure looks like she got burnt from too hot soil, but there's only light mix (the Dehner soil you recommended) in that corner of the planter, so I have no clue what is happening. I'll leave her until I have gotten rid of the gnats and only then decide if I should pull her and start over. I'd rather lose some time by starting over than keeping a stunted plant.
@nonick123, I agree 100% that it looks like a nutrient burn, but the thing is that she is growing in the corner of the planter with only lightmix, with no additional nutrients 🤷
@resi_max, What's alarming with an average VPD of 1.1? It should be 0.8-1.0 for seedlings, but it isn't that far off. Besides, I have absolutely no controls besides an exhaust fan, so there isn't much to tamper with.