Perhaps Ilex glabra (Inkberry Holly, Appalachian Tea, etc.).

I agree about going with the pitcher plants. Some are quite ornamental, even used in flower arrangements. I'd bet they would love that climate. But it's also true that they won't make much difference in reducing the fly swarms. Your plants will benefit more than the flies will suffer.

I used to never use gravel in the bottom of the pots. Until I started fighting root rot every time we get a week of rain. ProMix holds a lot of water and unless your pot is pretty much root bound, it's going to stay soggy. Even then, plants don't take up enough water when it's cloudy and raining. When you use a couple of inches of gravel, then put the window screen on top of it, you are creating an air pocket under the potting mix. Also, along with the air, the entire bottom surface of the potting mix can drain. I like that, I can flush my pots out a lot faster and better. You can't flush out the area dead center in a pot without elevating the potting mix. Your link is talking about adding gravel to the bottom of a pot - without - covering the gravel with window screen to elevate the potting mix. What you link is talking about is that gravel is denser than the potting mix and will not drain or aerate as well - when it is mixed with the potting mix. Elevating the potting mix above the gravel with window screen is two different things. From your link: "Some have suggested the placement of gravel in the bottom of containers improves drainage. In fact, the gravel decreases the total volume of medium with favorable aeration. The pores at the interface of the container medium and gravel must be saturated before water will move down into the gravel. This means that a layer of medium with near maximum water content is positioned above the gravel rather than on the container bottom. Therefore, the effective height of this container is reduced by the depth of the gravel in the bottom." What I'm talking about is creating a bottomless pot. Because of the window screen, the potting mix is elevated off the bottom of the pot by a couple of inches. There are no pores at the interface of the container medium and gravel, because the gravel and potting mix are not touching and are not mixed together. Make any sense? Corrie

These birds were definitely a distinctly rich yellow. Beautiful birds. My best recollection is that it was spring, though it has been several years since I've seen them. Do orioles travel in pairs? Would it be unusual for two females to be hanging around together like that?