I bought two 2 gal. pots of dwarf flame phlox. Can I separate the flowers in the pot to plant in my garden? I am hoping to be able to separate the flowers.
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.
I have two plants, a phlox and a coneflower, planted very near each other. Both are suffering from a similar plight, though I don't know what it is. The phlox is established, but the coneflower is new this spring. Each has a section/stalk that has turned completely black. What could be causing this, and what do I do about it?
Is the black soot-like? This could be sooty mold fungus, which is brought about through insect pests. Treating the plants with Neem oil should help with both the sooty mold and any pests that are contributing to the issue. Even if it's another type of fungal problem, Neem oil should still be effective. Here is more information: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
I have a problem with my tall garden phlox. Can you help? I live near Savannah, Georgia. Tall garden phlox are my favorite thing in my perennial garden. I have nothing that looks like powdery mildew; however, the leaves on my phlox will begin to wilt and then turn yellow and brown and seem to die. I especially have this problem with new plants. My husband thinks this is caused by too much water. We have an irrigation system that waters them (fine spray). I see no canker! Does this sound like over watering? We have had a good bit of rain, especially in the late afternoon. If so, how can I save them?
My tall phlox has done well for years. However, this year the leaves are light in color and are curling up. I believe I might have an insect infestation and have seen little black beetles on the leaves. I am going to spray with neem oil but I want to make sure this is the problem. Thanks!
Yes, treat the insects with Neem OIl. This is a good choice as it acts as both an insecticide and fungicide.
The yellowing leaf patter can indicate an iron deficiency in the soil.
Here is a link with more information.
I have just planted some reasonably sized phlox, approx 12" tall. They have been stripped very quickly by slugs, leaves and flowers and all that is left are the stalks. Are they retrievable, will they come back next year or do I need to do something?
Treat the plants for slugs.
Water sparingly into the fall and there is certainly a chance the roots will survive.
Phlox is generally quite hardy.
How soon can you cut back phlox after they have bloomed? Mine finished blooming about a week ago.
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
When should one prune Phlox? Is the best time in the spring and should they be cut back to about six inches or about halfway down the plant?
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.