Q.How long before new growth of phlox
How long does it take before I see any new growth after planting my Phlox root balls? I planted my Phlox “Boy Blue” in early April and I live in zone 9. How long before I can see if I have successfully planted it? I don’t see any signs of growth or greenery. I bought a box of 10 root balls at Sam’s Club and I’m hoping I wasn’t sold a bad batch. Thank you.

After planting, new growth typically appears in 2-3 weeks depending on soil and air temperature. So, it's a bit too soon to tell yet, I would give it some more time.
For more information on phlox, please visit the following link:
https://www.gardeningknowhow.com/ornamental/flowers/phlox/growing-garden-phlox.htm