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Care Instructions for Your Tall Phlox

Here’s how to get the most enjoyment from the Tall Phlox

  1. Location—Full sun to partial shade.
  2. Planting Distance—18-24" apart.
  3. Soil—Will do well in most well-drained garden soils.
  4. Bloom Time—Midsummer, with reblooming later if spent blossoms are pruned.
  5. Mature Height—24-40".
  6. To Plant—Potted: Dig a hole twice the size of the pot your Tall Phlox came in. Carefully remove the plant from the pot. Score a vertical mark on all four sides of the root ball to encourage roots to grow out into the surrounding soil. Hold the root ball in the hole with the top of the root ball level with the surrounding soil surface and carefully fill in around the root ball. Firm the soil around the plant with your fingers to remove any air pockets.
  7. To Plant—Bareroot: Dig a hole twice as wide and twice as deep as the roots. Remove the roots from the package and spread roots over the surface of the soil at the bottom of the hole. Adjust the depth of the planting so the woody crown (where roots and eye buds join) is about 1" below the soil surface. Carefully fill around and over the roots and crown with soil. Press to make sure each plant is firmly set and all air pockets have been eliminated.
  8. Water thoroughly after planting.
  9. Hardiness Zone: 4-8


Although Tall Phlox do well in average soil, for optimum results you can improve your soil as follows:

  1. Spade or rototill the soil to a depth of 12-15".
  2. Mix in a generous 2-4" layer of dehydrated manure, garden compost or peat moss and Spring Hill’s Advanced Formula Plant Food. (If soil is already rich in garden loam and well drained, the addition of our Advanced Formula Plant Food will provide the ideal conditions recommended by our nursery professionals for superior growth and blooming.)


Tall Phlox should be grown in clean cultivation, and they should be watered once each week in summer whenever rainfall is less than 1" per week. Each spring, apply a surface dressing of Spring Hill’s Advanced Formula Plant Food to your plants, scratch into soil and water thoroughly.

As flower heads fade, cut back old flower stems and, in many cases, you’ll enjoy a second flowering.

After your Tall Phlox have finished blooming in the fall and foliage begins to die back, cut the plants to the ground and remove all foliage. After the ground freezes, apply a 2-4" layer of mulch to protect the roots in areas where the ground tends to heave during periods of alternate freezing and thawing. Remove winter mulch in spring, being careful not to damage young growth.

Have another question? Return to the Customer Service Help page or send an e-mail directly to Customer Service .

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