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If you want to be absolutely sure of the plant you’re buying, then remember that the botanical or scientific name, including the cultivar name, is the most exact one. Some common names, like common basil, are very specific. All common basil has the same genus and species, Ocimum basilicum. However, a common name like daisy is so general that it may not be very helpful. This term can apply to plants very faintly related found in various genera (genuses). For instance, a “daisy” can be an African daisy (Arctotis or Gerbera), Dahlberg daisy (Dyssodia tenuiloba), English daisy (Bellis perennis), painted daisy (Chrysanthemum coccineum), Shasta daisy (Leucanthemum superbum), and many others. If you’re shopping by common names, read labels to make sure this particular kind of plant can grow for you.

The biggest problem with common names is that the same plant can have many different common names depending on what part of the United States or the world you live in.