Even though this is an older thread, I thought I'd comment on my experience with these plants, since it came back up. My Alocasia amazonica 'Polly' haven't been finicky for me. Mine have tolerated some neglect last year. Two of the bulbs went dormant through the winter, while the other two kept their leaves. Despite not getting watered as often as they should have. Now that spring is just around the corner, the two dormant bulbs are sending up leaves, while the the two active ones are shedding theirs. They may be going dormant, but I suspect it won't be for very long. I have since bought yet another one that my local garden center had just gotten in their latest shipment. I was planning on repotting my Alocasias anyways. So I'll be adding the newer plant in along with them into a larger pot. I absolutely love their interesting foliage. I haven't found them to be difficult to grow either. They have been very tolerant of my neglect. As for Anthuriums, they don't have any form of bulbs, tubers, or rhizomes. So they do not go dormant and continue actively growing throughout the year.

Does the container have drainage? This Summer, re-pot into a fast-draining mix that allows thorough watering. Josh

If you can post some photos you'll get better help here.

I am in the same area as you. I have a ton of Thuja Emerald & Green Giants that we planted in a new build landscape. I've not had this problem but did notice some sun scorch on a couple when we had those crazy temperatures in the 90's last season. I kept them on a deep watering schedule while keeping up with any rain, but as you may know, we had no rain for about a month and a half during that time period. I also make sure that when I plant in our area with hard clay, I add soil conditioner, which was first recommended to us by RiverBend Nursery. I've also used peat moss as well. We have never had trouble growing anything so far. I'm in a neighborhood with a lot of new builds. Luckily our builder had a great landscape company that planted actual trees & shrubs that flourish in our area. Another builder just threw in every possible plant that has issues in our area. Our neighbor is already unhappy with a Leyland Cypress they planted up against the front of their house. Those are the ones you will see busting out wooden fences that people planted too close around our area. I mean they are cheap. I saw them at Costco last week, about 6 feet in the pot for $60. I love Thuja's in our area. I just clean out the insides during the first of Spring to open them up to "breathe" better. They seem to grow taller after doing just that. I agree with gardengal about the dryness. It may be that they just plopped it down in the clay without adding anything else. Just know that whatever you decide to plant, make sure to add something to the soil to help the plants roots. And the other things I've learned is to check with the local extension to make sure of problem trees, shrubs, and plants that cause issues in our area because the big box stores will still sell them. I see them every season.