ricstr, the common name Slender Aster refers to 3 different species, Eurybia compacta, Symphyotrichum divaricatum and Symphyotrichum subulatum. Eurybia compacta,(Aster gracilis),doesn't occur in Texas. Your aster could be Symphyotrichum subulatum or Symphyotrichum divaricatum, which is another species of weedy lawn aster. The above link says the weedy, Slender Aster is Aster gracilis, which is now Eurybia compacta. That's not correct. Symphyotrichum divaricatum is commonly called Roadside Aster, but also Slender Aster. Symphyotrichum divaricatum was formerly Symphyotrichum subulatum var. ligulatum. Symphyotrichum divaricatum is easily confused with Eurybia divaricata, a totally different species. Compare your plant to the 2 species in the links below. They are both annuals, and you can get rid of them by not allowing them to drop seeds. It's very confusing with 3 species having the same common name. The photo in your link is really Symphyotrichum divaricatum, and not Aster gracilis,(Eurybia compacta). Normally the species names of old genus name Aster, remain the same except the end changing from us to um. Symphyotrichum divaricatum and Eurybia divaricata have both been named Aster divaricatus at different times in the past. When the most recent change was made Symphyotrichum divaricatum was called Symphyotrichum subulatum var. ligulatum, and it was elevated to species status. https://keyserver.lucidcentral.org/weeds/data/media/Html/aster_subulatus.htm https://www.kswildflower.org/flower_details.php?flowerID=280

I tried to comment earlier but I didn't see it go through, so apologies if this winds up a duplicate. If it is Sage, it is not a variety I'm familiar with. The leaves are a little waxy and have zero fragrance. The plant has more of a tendency to spread out along the ground and creep: it first sends shoots straight up, but they lie down as soon as they reach a certain size (not even a very big size) , then lie flat and continue to grow along the ground. It seems to have a taproot. I took a photo of it next to my sage bush for comparison, it usually grows more flat like pictured. It could be Sage, I just wouldn't be familiar with what variety. Right now it's growing several feet out onto my sidewalk in mat form.

I started getting that weed here in Monterey County about 4 years ago...and it smells faintly like dill to me too!

1. is foliage of Yarrow, Achillea millefolium. 2. is Mullein, Verbascum thapsus. 1. is perennial 2. is biennial.