What Is This Plant? It Just Popped Up In The Garden
Would this be a weed??
Certified GKH Gardening Expert
Yes. That is an invasive shrub. In fact, it looks to be Solanum aviculare or the Kangaroo Apple. It is quite beautiful, but very toxic.
This article will offer more information on the subject: https://www.gardeningknowhow.com/ornamental/shrubs/kangaroo-apple/kangaroo-apple-growing.htm