Can you divide garden phlox in the fall?
Yes, these plants can be divided in spring, late summer or early fall.
First - do you deadhead the flowers? Second - next spring when they come up, can I cut the tops off to make them branch out. Mine are one flower on one stalk. Thank you.
You can go ahead and cut them back anytime after flowering has stopped. Deadheading them may even promote additional flowering. Here is more information: https://www.gardeningknowhow.com/ornamental/flowers/fgen/deadheading-flowers.htm
I have had tall garden phlox for 4 years and it grows very tall but has never flowered. There doesn't appear to be any powdery mildew and the plant is healthy. It gets about 6 hours of sun daily. Why doesn't it flower?
I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not bloom well. Bone meal is a great way to add phosphorus.
My phlox is patchy. Shaded areas are ok but the areas exposed to more sun look dead. . . often with growth on long spindly dried out stems. Should I just cut it all back? How much and when?
The stems are normally cut back after flowering to promote a second bloom. Care of creeping phlox also includes cutting the plant back in late winter/early spring prior to new growth to allow for rejuvenation and to produce young, more compact stems.
I would let them be right now. If you cut the plant back now, it will only encourage new growth, which is not a good idea this time of year as the cold weather soon to come will only damage the plant, which should actually be getting ready to go dormant for the season.
Should I cut back garden phlox in the fall after they have flowered?
Yes, you can cut the spent flower stems to the ground at any time, but you should generally wait until spring for pruning back the remainder of the plant, just prior to new growth, as this normally triggers the regrowth process. If it is ginning to look unsightly, however, it will not hurt to give them a light trim.
I have beautiful Phlox planted that has spread across a bank I have. However, there has been hateful broom sage coming up through it. Is there some way to kill the broom sage without killing my Phlox? Please help.
Unfortunately, there are no selective herbicides that will affect only broom sage. The only option would be to hand pull the weed out.
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: