Verbesina encelioides for number 1, but please from now on only put 1 plant for each post. This many plants makes it very confusing.

#2 There are 2 different species of vines. One is in the Morning Glory family. Perhaps Ipomoea hederacea. The 2nd vine is Passiflora mexicana.

The vines look the same to me. They’re showing the typical butterfly leaves of immature Ipomoeas and also the mature ivy like foliage.

no. 4 appears to be a Juniper.

The corn like plant looks like a reed. Perhaps Arundo donax. If so I’m wondering if the fencing is to protect a boggy seep rather than the plant itself. Did you investigate the soil inside the fence?

In all my decades of growing every morning glory imaginable, I have never seen these 'immature butterfly leaves' ever. Check out the veins, they are totally different.

3. This weird tree looks like curry tree. Pick its leaves and smell them to be sure.

Agree the fluffy little blue thing is a cypress family conifer such as a juniper and the blue corn plant is an example of Arundo donax. One that is apparently drought stressed, due to its leaves being rolled.

Ipomoea hederacea showing both shape leaves here morning glory leaves “ Cotyledons are butterfly-shaped and usually narrower at the base. Leaves are alternate with erect hairs on both surfaces. The first leaf may be unlobed; all other leaves are three-lobed and ivy-shaped.“

OPs photo shows a mass of seedlings.

Yes you are right floral. I hadn't noticed they were cotyledons.😬

The Passiflora was wishful thinking.😂

First, my apologies for posting multiple plants in a single post.

Thanks for the help in identifying things. This is by far one of the most consistently useful spots on the internet. :-)

#1 - Crownbeard - got it, thanks! These are planted over the leach field. They were a pleasant surprise when they appeared.

#2 - Morning glory - Definitely only one type of vine...they literally just showed up days ago, and definitely still showing seed leaves. But...I'm still not sure how they showed up, haha. No sign of them anywhere else on the property, just on this rock-filled slope. Where they might make sense as a ground cover. (We've planted some creeping thyme here for the same purpose.) But they weren't there last fall. Weren't there this spring. Literally, no signs of any vines, living or dead. Just some irises planted in some spots within the rocks. These sprouted completely out of the blue about a week ago, all over the rock area, and then immediately started to die back for lack of water.

#3 - Still a weird little tree...I'll get some additional photos and make a new post.

#4 - Wee juniper. It'll be interesting to see how this grows out. The property is expectedly full of singleseed juniper (and gray oak), and this doesn't look anything like that. Fun surprise. :-)

#5 - Does look like arundo. NO clue why it's where it is, haha. I can't detect any dampness to the ground there. It's on the uphill side of the property, well away from the leach field area. I'm sure it's quite drought stressed, and not sure how it's survived unless there is some water there that I just can't detect without clearing that area. Interesting mystery.

Thanks again everyone.