That's typically a sign of over watering, made worse in hot weather. Make sure your pots are draining freely, if the bottom roots are sitting in water for a long time they will do this. Your moisture meter probably doesn't reach down that far. My Meyer is bigger and older than yours, in a 5 gallon pot, and I find that watering twice a week does well in sunny 80F temperature outdoors, and now that it's inside for the winter, once a week.

I have a tangerine and a grapefruit buth in ground with same issue...i don't think water just sits there, but it rain all the time here, so not sure what to do

Thanks hemlock

I think there’s free drainage as if I water too much it’ll eventually drip out the bottom. What do I do about these leaves? Should I cut them off or is it just aesthetics?

when the weather warms up here should I repot with some new soil? I had use a premium citrus soil but hadn’t mixed in anything for drainage like vermiculite, etc. given the tree is relatively young is it ok to repot it now? The weather will start to get really hot in about a months time in australia, like high 30°C/86F so I don’t really want to repot in that heat

thanks for your tips

Look in the drain hole, do you see roots? If root bound they can stop the water from draining out. Ideally you should see water come out the bottom withing about 10 seconds of pouring it on. Repotting will allow you to add some grit but with these timing is important, it should be done in spring before the heat, but when it starts to show new growth. If not rootbound I would wait another year.

Nah no roots, it's a half wine barrel that is pretty big and the tree itself is quite small so I think there is time still for the plant to grow roots.

I've taken the top mulch layer off and an attempt to let the soil dry out. I think over the winter we got so much rain and the mulched top prevented it from drying out before it got soaked again.

I'm considering mixing in some vermiculite into the pot (somehow without repotting the whole thing) to help with draining to prevent it getting waterlogged. It was planted in Osmocote premium citrus which is supposed to be a premium citrus soil but who knows. There is something about its environment it does not like right now...

Any thoughts as to why the lime tree leaves look weird? Surely overwatering wouldn't cause distorted leaves in one and downwards curl in another?