Agree with Floral_uk, it looks like one of the black nightshades, probably S. douglasii given your location. There are several very similar species, and they grow wild pretty much everywhere. I take great pains to ensure that they never go to seed in my gardens, and they still crop up from dormant seed or from bird droppings. When I lived in San Diego, the local Hmong community cultivated one of the black nightshades extensively. There is a pretty god write up of the various species & their properties in the link below. Personally, I would just treat it like the weed that it is & dispose of it. Really nice jade plant bush behind it, by the way. Here is a link that might be useful: Black nightshade

Chamaedorea elegans, PARLOR PALM Joe

Those dead woody stalks may be cut off now with shears. It sends up new ones each year. It is not a houseplant. Place it outside in bright full sun in rich soil. In the summer it will have crowns of tiny pink flower clusters which attract butterflies and moths. Then the flowers fade to a nice cinnamon in the fall and dry out. Cut the stalks down in December when they look like tan wood. I was given a sprig when I was 17 and now I am 60 and have given away many new divisions from mine. In 2 or 3 years when yours gets large, you may cut out 3 inch tall stalks in the spring to root easily in moist soil. The root base is woody too and the leaves hold lots of moisture so do not plant in a boggy area nor over water. Grow it on the dry side and feed with fertilizer twice during spring and summer. Good luck with it. They are very easy.

And for removal of invasives (which this isn’t), I use large adjustable pliers to pull ones that are smaller. The looser the soil, the larger the plant you can pull. For large ones there a few choices: - Get a weed wrench or similar tool to pull midsized plants. https://www.theuprooter.com/tool-features/weed-wrench-alternative/ - Cut to ground level and then revisit each plant about every other week for a couple of seasons to remove all new sprouts so the roots use up all stored energy. This takes both consistency and persistence because if leaves get a chance to form the plant will start making and storing energy again. - Cut to ground level and then paint the cut with a short lived brush strength herbicide. I use this option along with the first because I live on 200 acres and it is my only hope of decreasing my invasives. I like it as the lesser of two evils because it is very targeted to individual plants, and it uses the least possible amount. I do recheck certain invasives even after this treatment once because sometimes buckthorn repsprouts, but IME recutting will kill it.