It is a good idea to divide your phlox every 3 to 4 years. It will reinvigorate your plants.
Since tall phlox produces flowers in mid- to late summer, you can divide it in the spring before new growth begins. But since that time has already passed, you can divide it in the fall after the flowers have faded, but well before the threat of frost to give it time to establish.
When dividing, make sure each division has at least 2 or 3 shoots with roots attached.
Hi Edna,
It is a good idea to divide your phlox every 3 to 4 years. It will reinvigorate your plants.
Since tall phlox produces flowers in mid- to late summer, you can divide it in the spring before new growth begins. But since that time has already passed, you can divide it in the fall after the flowers have faded, but well before the threat of frost to give it time to establish.
When dividing, make sure each division has at least 2 or 3 shoots with roots attached.