Do Phlox Flowers Spread. Most phlox need to be divided every two to four years if theyre growing well. Both varieties spread but are not considered to be invasive making them great for borders and garden accents.
When planting position them as you would new plants with the crowns an inch or so below the soil surface. It grows in clumps and its leaves are lance-shaped. It spreads slowly growing in mounds that get 46 inches thick.
In general phlox spreads out as much as it grows up so this species can cover 3 or 4 square feet of soil easily.
The holes should be twice as wide as the plants root balls. The flowers bear a mild fragrance and come in a wide range of colors. 25042019 Creeping phlox or Moss phlox Phlox subulata is a low-growing species that works excellently as a ground cover. There are two main families of phlox.