The oldest leaves will always do that, they have a limited life time. As long as the newer leaves look good and any new ones emerging are looking healthy there's nothing to worry about.

Thanks for your input! I might be wrong but I thought since the yellowing leaves are smaller, then they are also younger than the big ones on top?

In a young plant you'll find the first leaves are quite small and successive ones come out larger until the plant matures. But if you take a close along the stem you'll see the sequence of leaf growth.

Thank you very much, I greatly appreciate your help! Glad to hear that this is normal. I was worried that it seemed three leaves were suddenly dying off around the same time. I may get a bit more life out of this one yet!

The soil looks like all peat to me and the cache pot (I dont think is allowing enough drainage), what is your location? Knowing that will let us know weather you can re-pot or not.I'm in NY and we only re-pot in the Spring when all the plants are starting to come alive again after their Winters rest...

I'm in the PNW, Seattle specifically. There's about half an inch of space between the cachepot and bottom of the nursery pot inside it. I thought that might be enough for drainage but perhaps not?

1/2 inch is good, the photo is deceiving or I need better glasses LOL

The photo is indeed deceiving! The smaller pot sits a little higher than the cache pot.

However, I am sad to report that a fourth, larger leaf is yellowing and about to drop off as well. It is still one of the smaller leaves overall (I suppose older leaves of the younger plant), so I'm hoping that this trend of dying leaves will end soon before there are none left!

Last winter I had 3 small Colocasias indoors and they would only hold a 3rd leaf for 1-2 days after the newest leaf unfurled. So maybe yours is just getting acclimated to the winter light...which will increase after tomorrow. But the correct amount of water is a challenge. It seems I may be giving mine too much even with being mindful of not overwatering. Here are my indoor EE leaf statuses which I hope will help you gauge how your Amazonica is doing:

Large Colocasia- 4 not so impressive leaves

Large Alocasia m. 'Borneo Giant' pup - 2 nice leaves

Small Alocasia. m. 'Black Stem' pup - 1 nice leaf

Small Alocasia calidora pup - only 1 petiole whose leaf browned & died as a spike (so nothing coming out of the pot but a single green stem)

Small Colocasia e. 'Mojito' - main plant rotted at base from too much water and attached are 2 sickly pups. It smelled like a damp cellar yesterday so I took it out of the pot to look at it and saw the rot. I re-potted it with a more aerated soil and will back off the water.

Small Yautia - keeps 2-3 good leaves...this is the only EE that was potted before bringing indoors

Alocasia amazonicas are heat-loving plants. This is why they don't make the best houseplants. I grow mine outdoors for most of the year, and during the summer, mine grows like a weed. I may not tolerate the heat and humidity down here in the South, but these plants crave it.

If you want it to do better, then move it to a warm location and use a plant heating mat to give it some bottom heat.

I agree with Photo that Amazonicas do not make very good houseplants. They are very sensitive to heat, humidity, and water conditions especially in the peat heavy nursery mixes. It's kind of hard to tell with the picture you posted, but that doesn't look like an Amazonica. Maybe something from the Safari line? The hybrids tend to get even more finicky in my experience. Good luck!

I believe yours is the hybrid “Morocco”. You’re in Seattle? Did the plant come from Homestead Plant shop?

I have an Amazonica and I haven’t lost any leaves this fall or winter so far. I do wait to water until the first few inches feel dry and then I water thoroughly until water comes out of the holes. I wait a few minutes and then tip at a 45 degree angle to get any remaining water out. I have mine sitting in a southern facing window that is a little shaded due to a large cedar tree. But because it’s the PNW, the southern window is still the most sun. In summer I had it in a Northern window and it was happy.

That being said some of my larger colocasias are down to three leaves or so per plant.

Whats the light situation for the plant? How do you water when you water?

I think mine is doing the same. I actually came here to ask the same question! I repotted recently and a leaf dropped. I trimmed it off bc the stalk got super mushy and now two more have dropped a week later. Looks like it sprouted some new ones though. I'm in northwest Arkansas and its dryer in the winter. Should I put her in the bathroom window where the humidity from showers will help? Or nah?

These are heat-loving plants. These plants crave it. Which is why they don't make the best houseplants. Room temperature just won't cut it for them. If that's not enough to convince you, then check out how well my Alocasia Amazonica grew back during the summertime...

Hello everyone, I am so grateful for all the advice everyone has contributed. This is a supremely wonderful community! I wanted to report back that my plant was indeed suffering from lack of heat. It went into dormancy and by the end of winter, it has lost all but one small leaf.

However, as spring rolled around and the weather started warming up again, the plant grew two new shiny leaves. One of them is comically enormous and while the plant is nowhere near as bushy as it used to be, I'm glad it is not dead. I may consider investing in a heating lamp for this plant once winter is here again.