Downtoearthdigs
Answered on July 4, 2015
Yes, you can spilt the Phlox, but I would wait until fall or at least until they are done flowering.
Then make the divisions and water well.
Here are a couple of links for you.
https://www.gardeningknowhow.com/garden-how-to/propagation/propgen/dividing-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/phlox/growing-garden-phlox.htm
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