Question 1

Have known cultivars or crops
disappeared as the suspect grows?

We often remove weeds because they out-compete planned lawn grasses, garden bed plantings, and food crops. When you know you planted Kentucky bluegrass, a Rose, or Tomato just there, and when you see something there that looks nothing like Kentucky bluegrass, a Rose, or Tomato it may meet the criterion for weed-hood.

When you plant a whole new garden with wide varieties of plants and when little seedlings or simple foliage emerge, it’s hard to differentiate the chosen plants from the weedy volunteers. If you plant a mono-culture, anything that is not that sole and only plant is clearly out of place. Not so with mixed borders. Please, if you’re new to gardening, be patient and learn to recognize the shapes and performance of your special plants. I know it sounds too elementary, but a little study goes a long way. It takes time, and you’ll pull some cultivars out accidentally, but hey, who’s perfect.