Benjamina leaves turning purple then curling

BonsaiManic

Shohin
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Location
SE New Mexico
USDA Zone
8a/
I don't want to panic, but there's definitely something going on here. I'm keeping these little guys in a homemade terrarium made of a large cheeseball jar with a thin layer of aquarium gravel in the bottom to hold just enough water to keep the humidity high. They've been healthy and vigorous since I got them at the end of May, and transplanted them into larger pots early June. Noticed this yesterday, leaves drying and dying today. Any suggestions?20240714_134634.jpg
 

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These spend all day and night on my north-facing front porch. Early morning sun, late afternoon filtered sun, shade most of the day. Temperatures usually in the mid 90°s to 105°.
 
Photo 2 looks like either the leaves are burning or you have some kind of pest. At those temps, I can't imagine it takes very long for the soil to dry out, so also make sure you're not underwatering
 
These can handle a lot of moisture… If you have good draining soil, it’s hard to overwater them. The pictures are tough to tell exactly what’s going on. Looks like it might be sun scorching. If the leaves grew originally with low indoor light, and now they’re outside sometimes they can’t handle the transition very well and will drop the old leaves. You have new leaves pushing which is a great sign.
 
Looks to me like you're cooking your trees. Enclosing them in a transparent jar that allows heat in, but doesn't allow it to exit (which is how a terrarium works), allows heat to build up, especially in the soil. If it's 100 F outside, it's hotter inside the jar.
 
They've been healthy and growing like crazy in this situation for 6 weeks, and suddenly leaf scorch. I keep reading where people are overwatering F. benjamina, so I've been careful not to do the same thing. But if you are correct, then I probably did let them dry out too much. I have a F. triangularis in the same container, but it has much more water retaining soil. Considering it is unaffected, it is most likely a lack of water issue.
I appreciate all ya'lls advice. Maybe I will cut some holes in the lid to allow some heat out while still keeping the humidity high.
I dunked them in a shallow bucket for a good soaking yesterday and then let them drain. The substrate is crushed brick, so it drains right away. Last week I found roots growing out the bottoms of the pots, so I assumed I was doing everything right. But a rookie who refuses to learn will always be a rookie. I'm looking to grow with my pet trees, so, I humbly thank you for your help.
 
They have recovered and put on strong growth; you'd never know they suffered. I found this baby assistant a couple days ago on my F. triangularis. Nothing wrong with organic pest control!
(You have to find Waldo)
 

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We had a population explosion this year; we've been seeing them everywhere, to the point we have to watch our step. I love geckos!
 
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