How to Grow and Care for Woodland Phlox

Woodland phlox, also known as wild blue phlox, is an herbaceous perennial prized for its colorful, fragrant flowers. It grows in mild climates, doesn't need much sunlight, and performs well in a variety of well-draining soil types, making woodland phlox a versatile option for your garden.

Woodland Phlox Care

Woodland phlox is a perfect native-plant option for gardens with dappled shade. Most gardeners treat it as a flowering ground cover or edging plant. Here are the main care requirements for woodland phlox:

• Choose a shadier spot that gets dappled sunlight.
• Prepare nutrient-rich, well-draining soil.
• Water regularly but do not let the plant get soggy.
• Fertilize each spring with compost to mimic the natural conditions of the forest floor.

Light

Woodland phlox grows best in checkered shade so do not try to grow it in full sun unless you live in a cool climate. Find a location in your landscaping that will best mimic the flower's natural habitat, providing this perennial with, at most, filtered sunlight.

Soil

Try to mimic the rich, moist soil that you'd find in woodland conditions. The soil should also drain well for best results. The plant, however, is very adaptable and will tolerate dry, clay soil, especially when it is established.

Water

Keep the soil of woodland phlox evenly moist, but never waterlogged at all times. An application of landscape mulch will help retain moisture in the location that you have selected.

Temperature and Humidity

This plant can handle a good deal of humidity but doesn't like overly hot temperatures, so take care to keep it in dappled shade. Anything that mimics the conditions on the forest floor is best.

Fertilizer

In the wild, woodland phlox is naturally fertilized when the leaf litter in the forest breaks down to become leaf mold. Keep it fertilized in your landscape by working compost into the ground around your plant annually in spring.

Types of Woodland Phlox

There are many other attractive types of phlox. Popular cultivars of woodland phlox and other phlox species include:

• P. divaricata 'Blue Moon': a cultivar with large violet-blue flowers
• P. divaricata 'Fuller's White': a cultivar with white flowers
• P. stolonifera (Creeping phlox): a low-growing, mat-forming ground cover.
• P. subulata (Moss phlox): a creeping phlox that forms a carpet of color in the spring
• P. paniculata (Garden phlox, tall phlox): panicles of blooms atop tall stalks in the summer

Pruning

Lightly cut back stems after the plant flowers to clean up the garden's appearance. Prune in the late summer and fall if you do not want the plant to reseed. Be aware that if phlox stems flop over onto the ground, there will be leafy shoots that begin to root at the nodes and grow increasing the colony's spread.

Propagating Woodland Phlox

There are several options for propagating woodland phlox. It can be grown from seed, mature plants can be divided in the spring or early fall, it can be propagated from stem cuttings in the spring, or root cuttings in early fall. 

To divide the plant in the spring or early fall:

1. Use a shovel with a sharp edge and detach a section of rooted stems at the point where you would like to divide the plant. Make sure that each division has a good amount of roots attached to it.
2. Dig around the division until you can easily lift it out of the ground without ripping off any roots.
3. Transplant the divisions in a new location at the same depth as the original plant. Water them well and keep them moist until you see new growth.

To propagate with stem cuttings in the spring:

1. Using clean, sharp pruners or a knife, cut a stem from the base of the plant. Select one that has three or four sets of leaves. Remove the lower leaves from the cutting.
2. Dip the cut ends in rooting hormone. Plant the cuttings in a pot filled with moist potting mix. Place the cuttings in an outdoor location with indirect sunlight.
3. Cuttings should root in four to eight weeks. Check for roots by very gently tugging on them. When you feel resistance, roots have likely formed.
4. Transplant them in the garden soil at the same depth as the original plant. 

Root cuttings taken in the early fall are handled similarly to stem cuttings but you can transplant them into garden soil right away. Keep them evenly moist in the absence of rain and cover them with a layer of mulch for winter protection. Mark the location because you won’t likely see any growth in the fall but the plant should take off the next spring.

How to Grow Woodland Phlox From Seed

The seeds of woodland phlox need 60 days of cold stratification to germinate. Outdoors, this would happen naturally in winter. Here's how to grow woodland phlox from seed on your own, using the fridge:

1. Place seeds and a stratification medium (damp paper towel, coffee filter, sand, or vermiculite) in a sealed plastic bag.
2. Use about equal parts of sand and seed and keep the medium damp but not wet.
3. Store them in the refrigerator at a temperature between 33 and 40 degrees Fahrenheit.
4. As soon as the ground can be worked in the spring, sow the seeds outdoors.
5. Keep the soil moist at all times, and the seedlings should emerge within a few weeks.

Overwintering

Woodland phlox fares well during winter within its hardiness zones without much care, but mulching before the first frost will protect the plants in colder regions.

Common Pests and Plant Diseases

Woodland phlox is susceptible to spider mites and powdery mildew. As with any plant vulnerable to powdery mildew, aeration through appropriate spacing can help. It also helps to give woodland phlox a haircut after it has finished blooming since rampant growth can inhibit air circulation. 

How to Get Woodland Phlox to Bloom

Woodland phlox blooms readily when in healthy conditions. And since it's fairly low-maintenance regarding sun and soil needs, these conditions should be easy to achieve.

Bloom Months

Woodland phlox tends to start blooming in April and continues to bloom until June.

What Do Woodland Phlox Flowers Look and Smell Like?

Woodland phlox puts out a show of dainty, blue-purple flowers. Each of these smalls flowers has five petals, and the blooms are known for their sweet fragrance.

How to Encourage More Blooms

Woodland phlox is unique in that it requires pollination from long-tongued insects to bloom. Therefore, you want to introduce or encourage certain insects, including bumblebees, tiger swallowtails, sphinx moths, hummingbirds, and skippers. It can be helpful to plant a variety of flowers nearby that will draw these creatures to the area.

Caring for Woodland Phlox After It Blooms

Once your woodland phlox has stopped blooming for summer, leave the foliage behind so that it can start storing energy for next year.

Deadheading Woodland Phlox Flowers

Deadheading spent woodland phlox flowers will encourage it to keep putting out more flowers, possibly even extending its bloom season.