Second one might be Deerberry, a blueberry relative. But if it is, the flowers in your photo are only just starting to open. WW Here is a link that might be useful: Deerberry

The first one looks like Chinese Forget-Me-Not (Cynoglossum amabile). HTH Chris

It depends on your site and what your ultimate goal is for the area. Eliminating existing competition from whatever is growing there now will most often give you the best results if you want to promote a dense planting of native wildflowers and grasses. Think about this way. Whatever is growing there now has already proven its ability to outcompeted native vegetation. That's why those species are flourishing there instead of native plants. If on the other hand, you have a significant amount of native species, then it might be reasonable to work with what you have. It is also possible that you may be satisfied with not going totally native and to just have a meadow look with the option of introducing additional species to add color and interest; albeit, hoping that those introduced species can coexist with the existing vegetation. The advantage of going the later route is that it will be a lot less work. You have to check with local weed laws to see if any of the above options are viable.

The crinum by the ditch is a good example that others may also enjoy it, and would be saddened to see that one day, it disappeared. Of course, we can't stop someone else from doing it, so it might very well be us who have lost the enjoyment of seeing it. In my case, I had a recent situation about this, too. A neighbor's brugmansia grows on the outside of his fence, accessible by the sidewalk. Last fall, I had thought to snip off a branch or two and try to root them for my own plants, but I thought how the owner might feel to see his branches snipped off, even if I thought I was careful in making it inconspicuous. Well, a few weeks ago, I noticed that he had cut it all the way down to the ground. So now I regret not asking or taking a few small cuts. Of course, just because he got rid of it doesn't mean I had any reason to take some for my own, but it's definitely one of those situations where you think how you could have taken a bit of the plant earlier and no "apparent" harm would have been done. But often times, we think there is no harm, except for the fact of sometimes not asking the owner first, who might very well notice and exclaim, "Hey, someone cut my plants!"