Note the milky sap flowing from the cut stem.  Also note the pubescense on the stem, another common characteristic of prostrate spurge (Chamaesyce maculata).

Below are two weeds that also have prostrate growth habits.  Neither prostrate knotweed nor common purslane are a concern in container production, but all three weeds are common in the landscape.  By looking for the milky sap you can easily discern which is prostrate spruge.

Prostrate knotweed
Common purslane

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