Hope Philodendron half yellow and translucent
I inherited a neglected Hope Philodendron with one leaf. I was super happy when it rallied and put out three new leaves. But then suddenly the main leaf turned yellow, drooped, and died off. I thought perhaps I had overwatered so I let it sit for longer and the plant seemed fine -- until a few days ago when one of the leaves very suddenly went half yellow. 

I had a look at the roots and there's no root rot but it did seem like the roots needed more space, so I repotted it. I also looked at nutrient deficiency charts since the way the leaf was yellowing was sort of an odd pattern, and deduced it might be nitrogen or phosphate, so I put a bit of coffee and also citrus rinds in the soil as suggested. 

The leaf is still yellowing (and looking oddly translucent?!), but it's not drooping so far... and the very tiny yellow circles/tip on one of the other leaves don't seem to be spreading, or at least not quickly, so that's good... 

I'm just curious if anyone knows what's actually wrong with the plant (since it's not the usual under/overwatering suspects), and if I did the right thing? 

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    Julia Barry [278958,Pei] & [286271,Paris Lalicata] -- Thanks for your help so far. This plant continues to be mysterious. After I repotted it with coffee grinds and citrus peels in July the plant was super happy, even put out new leaves, and the yellowing on the other leaf stopped.

    But yesterday I watered it after a *month* of letting it dry out, and instantly this morning all three leaves have that weird discoloration/going-transparent thing happening around the edges, and one of the leaves is already starting to droop. :/ Pic attached.

    I did water it with a tiny bit of fertilizer -- could that be it? Or what else could be happening? (I really don't think it's bugs since the plant's been totally fine until literally immediately after I watered it.)

    Thanks for your help!!
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      Pei Hi [291378,Julia Barry] What was the water temperature? I suspect it's a combination of the coffee grid + peels + fertilizer is shocking it? From my experience, Alocasia tbh is not the easiest plant and they go through a self-pruning period too. I'd give it a few days and keep an eye on it. I would keep an eye on it.
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    Julia Barry So far so good! The slight yellow spots on the other leaves have not spread or changed, and the plant it putting out a new leaf! So far it seems like it just needed to be repotted so the roots stopped poking out the bottom of the pot, and the coffee/citrus peels are providing it with some nice nutrient-rich soil. Fingers crossed, thanks for your help!
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    Julia Barry Thanks [286271,Paris Lalicata], so much good advice in there! [278958,Pei] I don't think it's mushy.

    Someone else told me that the fact that it's going translucent means it has bugs that are sucking the life out of it, but I don't see anything under the leaves...
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    Pei does it feel mushy or dry to the touch?
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    Paris Lalicata Hi [291378,Julia Barry] ! How long did you have the plant before the oldest leaf passed? I don't think the main leaf dying back is a concern as it's perfectly natural for older leaves to die back overtime, especially considering it was neglected for so long and then had the energy to put out 3 new leaves! It seems like it simply ran its course. However, one of the newer leaves yellowing does sound concerning. As long as the plant is receiving plenty of bright indirect light, and you only water once the soil has dried out completely then it shouldn't be an indication of over watering. Especially if the leaf has only chlorotic damage and isn't actually dying back (I myself have had a pinstripe Calathea display this). Did you replenish the plant with fresh soil since it arrived, or when you re-potted? If not, or if the plant has not been fertilized in quite awhile then this could be a nutrient deficiency. Nitrogen and Phosphorus are the two elements that are most likely to become deficient and symptoms for each both occur in older leaves first. However, Phosphorus deficiency displays a more purpling/reddening hue which doesn't seem to be the case here. I would say moving forward, if you haven't given the plant new soil, which already has some of the macro-nutrients plants need then I would go ahead and do so! Every time you water the plant these nutrients will dissolve into soluble salts (basically a form easier for the plant to absorb) and "feed" the plant. I would monitor the yellowing leaf in the road ahead, but there is a chance it will either remain this color or die back. As long as it's not continuing to spread to the other leaves it should be good to go! Once you believe the plant is more stable and growth isn't stunted I would fertilize the plant but would cut the recommended ratio in half diluted in the water you water the plant with. This way you're giving the plant a little nutrient boost as it's actively growing during the Spring/Summer. I hope this helps!:)
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      Julia Barry Yeah this does seem to be part of the way this plant does life... pretty much every time a new leaf sprouts, an older one dies off after. I'm curious to see how this plant will ever grow in that case! But for now, it's still alive and doing pretty well -- adding coffee to the soil seems to stop the yellow spots and make the plant happy, but now that it's not growing season, I'm wondering if it's ok to add coffee with watering or not?
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        Paris Lalicata I would recommend holding on adding coffee to the soil during the Fall/Winter, unless it's used coffee grounds which are more neutral in pH. However, since daylight hours will decrease the plant is going to take up less water and nutrients during this period so providing extra may harm it! That said, when was the last time the plant was repotted? Sometimes if leaves die keep dropping after new ones develop it could be a sign that the plant has outgrown its container. Or it's just an indication that the plant can only care for the amount of leaves present at the time with its given environmental conditions. Therefor, if the plant is freshly repotted then creating more optimal conditions for the plant may help prevent further leaf drop!