These stems might stop growing flowers as the time goes by, so you should trim them occasionally. Do not overfertilize plants. It flowers in the spring (mine is just about hitting it's full flowering capacity right now) and then stays green and slowly spread for the rest of the growing season. They wilt under bright sunlight, or sometimes curl and pucker. I have to keep pulling it out by hand and some of it actually has roots. Phlox stolonifera is also called 'creeping phlox' and spreads in width each year with little runners. It is sometimes nicknamed creeping phlox because it does root as it spreads. These were in my garden with full sun. Creeping phlox produces long stems that are green when new, but turn brown and woody with age. ... Every year long blades of what looks like grass starts growing in my creeping phlox. - After a VERY cold winter, my tree has started turning brown. Last summer my phlox began to yellow, turn brown and die. Spray stubborn infestations with a pyrethrin/pyrethrum insecticide according to label instructions. It got less deep green over the winter but even then was more green than not. It prefers full sun. For most of the year it makes good ground cover. Phlox leaves may turn yellow or brown. A. Pests could be a problem if you live in a very dry or humid place. Spray the insects with an insecticidal soap product as directed on the label. Phlox subulata is 'moss phlox' and grows only a few inches tall with hundreds of flowers. I've never had creeping phlox turn brown on me. I had some at the house in shade that did well. How Do I Care For A Pindo Palm When The Fronds Are Turning Brown? Answered by theficuswrangler on May 30, 2014. There are 3 spring phlox's. Lots of confusion on this one.