Wireweed, Aster-subulatus?

4 to 5 days sounds about right for a Fuchsia. What are the growing conditions-are the pots draining?

The three Sandmats in TX that look similar (glabrous, and relatively dense clusters on long peduncles), are nutans, hyssopifolia, and hypericifolia. Although TX is a bit ahead of my south-central Arkansas location, we see hyssopifolia and hypericifolia in June. C. nutans doesn't show up until July. Nutans' leaves are also more toothed, the plant is often upright, the fruits are typically green with red highlights, and the flowers are single, or occurring in small clusters. Your plant probably isn't C. nutans. C. hypericifolia is difficult, because there are cultivars like Diamond Frost, as mentioned above. Those tend to have flowers with long, white petals. But the wild hypericifolia looks much like the plant in your photo. It has very dense clusters of flowers, and is often reclining in form. C. hyssopifolia also had dense clusters, and flowers about the same time as hypericifolia. That one often has stems rising at 45+ degrees. The ID is most likely hypericifolia or hyssopifolia. They can be identified by minor differences in fruit, etc., but are difficult to determine from photos. If your plant is large (similar in size to nutans) and relatively upright, my best guess is hyssopifolia.

Well fascinating, Buglossoides arvensis (Corn Gromwell) is not native...but is at least apparently one of the richest natural plant-based sources of omega-3 SDA (stearidonic acid) known. Of which the body converts (SDA) to EPA at a rate of up to 30%, compared to a typical conversion rate of ALA (alpha-linolenic acid found in most plants) of 3-6%. So, it's essentially a surprising little superfood plant that carries many benefits, despite being an import.