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Creeping Phlox Guide: How to Plant and Grow Creeping Phlox

Pink flowers of creeping phlox (Phlox stolonifera)

If you’re looking for a flowering ground cover that’s not only beautiful but also easy to grow, then Creeping Phlox is the one for you. Known for its stunning carpet-like growth and vibrant blossoms, this plant is a favorite among gardeners.

This stunner is so vibrant that its vibrancy is even reflected in its name which refers to the intensity of colors! The genus name phlox is derived from the Greek word phlox, which literally means ‘flame.’

White and purple flowers of creeping phlox in the garden

Photo Credit: Shutterstock.

This vigorous perennial is native to the eastern United States. Native to rocky and sandy areas, ledges, clearings, and slopes, it can be found from Michigan and New York to the Appalachian Mountains in Pennsylvania and Georgia.

It is renowned for its creeping habit and the thick carpet of flowers that bloom from early to mid-spring before becoming sparse until frost. The common name of moss phlox comes from the cushion-like foliage mats, which resemble moss.

This flowering plant can be used in rock gardens, edgings, ground covers in sunny areas of woodland gardens, slopes, native plant gardens, or naturalized areas.

As a master gardener, I love sharing my love for flowering ground covers like creeping phlox. So, in this article, I’ll go over various aspects of growing and caring for creeping phlox, from its light requirements to its common pests and diseases. By the end of it, you’ll be able to easily grow it!

Botanical Name: Phlox stolonifera

Common Name: Creeping phlox, moss phlox, star rock phlox

Family: Polemoniaceae

Plant Type: Herbaceous, perennial

Hardiness Zones: 5 – 9 (USDA)

Sun Exposure: Full sun to partial sun

Soil Type: Loamy, well-drained

Soil pH: Acidic, neutral, alkaline

Height: 6-12 in. tall

Bloom Time: Spring, summer

Flower Colors: Purple, pink, white

Native Area: North America

Creeping Phlox Care

Creeping phlox, also known as Phlox stolonifera, is a low-growing perennial plant that is native to North America. It is highly valued for its beautiful, carpet-like appearance and its ability to spread and fill in empty spaces in the garden.

Focus shot of white and purple flowers of creeping phlox

Photo Credit: Shutterstock.

With its vibrant and fragrant flowers, creeping phlox is a popular choice for rock gardens, borders, and slopes.

Proper care is essential for the health and vitality of creeping phlox. By providing the right conditions, you can ensure that your plant thrives and produces an abundance of blooms year after year.

Let’s dive into the details of how to care for this stunning plant.

Light

Creeping phlox thrives in full sunlight, although it can tolerate partial shade. Ideally, it should receive at least six hours of direct sunlight daily. By placing it in a sunny spot, you will encourage healthy growth and vibrant blossoms.

However, in regions with scorching summers, providing some afternoon shade can protect the plant from heat stress. Monitor the light conditions of your garden and adjust accordingly to provide the optimal environment for your creeping phlox.

Creeping phlox with pink flowers on the edge of the lawn in full sunlight

Photo Credit: Shutterstock.

When it comes to sunlight, it’s important to note that creeping phlox is a versatile plant. It can adapt to a wide range of light conditions, from bright and sunny to partially shaded areas. This adaptability makes it a great choice for different garden settings.

Soil

The soil plays a crucial role in the growth and development of creeping phlox. It thrives in well-draining soil with a slightly acidic to neutral pH level. Before planting, enrich the soil with organic matter such as compost or peat moss to improve its fertility and drainage.

Test the soil’s pH and make any necessary amendments to ensure it falls within the ideal range of 6.0 to 7.0. Remember to avoid excessively compacted soil, as it can lead to root rot and other issues.

Pink creeping phlox with green foliage planted in soil in the garden

Photo Credit: Shutterstock.

When it comes to soil type, creeping phlox is not too picky. It can grow in sandy, loamy, or clay soils as long as they are well-draining. However, if you have heavy clay soil, consider adding some sand or organic matter to improve its drainage.

Water

Watering is a vital aspect of caring for creeping phlox. While it requires regular watering to establish a healthy root system, it is also essential not to overwater, as this can lead to root rot.

During hot and dry periods, water deeply once or twice a week, allowing the soil to dry out slightly between waterings. Avoid watering the foliage to minimize the risk of fungal diseases. As the plant becomes established, it will become more tolerant of dry spells.

It’s always a good idea to check the moisture level of the soil before watering. Stick your finger about an inch into the soil, and if it feels dry, it’s time to water. If it still feels moist, hold off on watering for a few more days.

Temperature and Humidity

Creeping phlox is a hardy plant that can withstand a range of temperatures. It is adaptable to both cool and warm climates, making it suitable for various regions.

However, extreme heat coupled with high humidity can sometimes stress the plant. Provide adequate air circulation by spacing the plants apart and avoiding crowded areas. Additionally, consider mulching around the base of the plant to help retain moisture and regulate temperature.

Creeping phlox or moss pinks under the sun

Photo Credit: Shutterstock.

When it comes to temperature, creeping phlox can tolerate cold winters and hot summers. It is hardy in USDA zones 3 to 9, which covers a wide range of climates. Whether you live in a frosty northern region or a scorching southern area, you can enjoy the beauty of creeping phlox in your garden.

Fertilizer

Applying a balanced slow-release fertilizer in early spring can help promote the growth and flowering of creeping phlox. Choose a fertilizer specifically formulated for flowering plants and follow the manufacturer’s instructions for application rates.

Alternatively, you can use organic options such as compost or well-rotted manure to provide the necessary nutrients. Remember to water the plant thoroughly after fertilizing to ensure the nutrients reach the roots.

Compost in wheelbarrow in the garden filled with phlox flowers

Photo Credit: Shutterstock.

Fertilizing your creeping phlox once a year in spring is usually sufficient. However, if you notice that the plant is not producing as many blooms as usual or if the foliage looks pale, you can give it a light application of fertilizer in mid-summer to give it a boost.

By following these care tips, you can enjoy a stunning display of creeping phlox in your garden. With its vibrant colors, delightful fragrance, and low-maintenance nature, this plant is sure to be a showstopper in any landscape.

Types of Creeping Phlox

Creeping phlox is a versatile and beautiful plant that comes in a variety of colors and cultivars, allowing gardeners to choose the perfect fit for their landscape.  Let’s explore some popular phlox species:

  • Garden Phlox (Phlox paniculata): This type of creeping phlox is a perennial favorite among gardeners. It produces showy clusters of flowers in various hues, including shades of pink, purple, blue, and white. The flowers are known for their fragrance and attract butterflies and hummingbirds to the garden. Garden phlox is a tall variety, reaching heights of up to three feet, making it an excellent choice for the back of flower beds or as a focal point in the garden.
Garden phlox flowers with white petals and on the center

Garden Phlox (Phlox paniculata) – Photo Credit: Shutterstock.

  • Moss Pinks (Phlox subulata): If you’re looking for a low-growing variety of creeping phlox, moss pinks are the perfect choice. As the name suggests, moss pinks form a dense mat of evergreen foliage, creating a carpet-like effect. They are known for their vibrant pink, purple, or white blossoms that cover the plant in spring. Moss pinks are excellent for rock gardens, slopes, or as ground cover in sunny areas.
Moss Pinks blooming with green foliage and pink blossoms

Moss Pinks (Phlox subulata) – Photo Credit: Shutterstock.

  • Annual Phlox (Phlox drummondii): If you want to add a touch of wild beauty to your garden, annual phlox is the ideal choice. This native wildflower displays colorful blooms in shades of red, pink, purple, and white. The flowers have a delicate fragrance and attract butterflies, bees, and other pollinators. Drummond’s phlox is an annual variety, meaning it completes its life cycle in one year. It is perfect for adding a pop of color to borders, containers, or mixed flower beds.
Annual Phlox in the garden with red, pink, and purple flowers

Annual Phlox (Phlox drummondii) – Photo Credit: Shutterstock.

How to Propagate Creeping Phlox

Propagating creeping phlox is a rewarding way to expand your garden and share its beauty with others. There are two primary methods of propagation: division and stem cuttings.

Division

To divide your creeping phlox, carefully dig up an established plant and gently separate the root clumps into smaller sections. This process is best done in early spring or fall when the plant is not actively growing.

Once you have lifted the plant from the ground, use a sharp knife or garden spade to divide the clumps. Ensure each new section has enough roots and foliage to support its growth.

Gardener with orange and black gloves planting creeping phlox in the soil

Photo Credit: Dreamstime.

After dividing the creeping phlox, it is essential to prepare the soil before replanting. Choose a location that receives full sun or partial shade and has well-draining soil. Loosen the soil in the planting area and amend it with organic matter, such as compost or aged manure, to improve drainage and fertility.

Once the soil is prepared, gently place each divided section of creeping phlox into the ground, making sure the roots are spread out and covered with soil.

Space the divisions about 12 to 18 inches apart to allow for proper air circulation and growth. Water the newly planted divisions thoroughly, ensuring that the soil is evenly moist but not waterlogged.

Throughout the growing season, provide appropriate care for the divided creeping phlox.

Stem Cuttings

Another method of propagating creeping phlox is through stem cuttings. This technique is best done in early summer when the plant is actively growing and producing new shoots.

Macro of the stem and leaves of a growing creeping phlox

Photo Credit: Shutterstock.

Select healthy non-flowering stems and cut them into 3 to 4-inch sections, making sure each cutting has at least two sets of leaves.

Before planting the stem cuttings, prepare a well-draining potting mix. Combine equal parts of peat moss, perlite, and vermiculite to create a lightweight and moisture-retentive medium. Fill small pots or trays with the potting mix, leaving about an inch of space at the top.

Remove the lower set of leaves from each cutting, leaving only the top set of leaves intact. This will help reduce moisture loss and encourage root development. Dip the cut end of each stem cutting into a rooting hormone powder or gel to stimulate root growth.

Plant the stem cuttings in the prepared potting mix, burying them about an inch deep. Gently firm the soil around the cuttings to ensure good contact and stability. Place the pots or trays in a location that receives bright indirect light, such as a windowsill or greenhouse.

Keep the cuttings moist but not waterlogged by misting them regularly or placing the containers on a tray filled with water. Avoid overwatering, as excessive moisture can lead to rotting. Within a few weeks, roots will develop from the cuttings, and you will notice new growth emerging from the top set of leaves.

Once the cuttings have established a strong root system, you can transplant them into individual pots or directly into the garden. Choose a well-draining location with full sun or partial shade, and prepare the soil as mentioned earlier.

How to Get Creeping Phlox to Bloom

Blooming white Phlox paniculata flowers in a garden

Photo Credit: Shutterstock.

Creeping phlox is a natural bloomer, but there are a few steps you can take to enhance its blooming potential:

Firstly, pruning is an essential practice to encourage a dense and compact growth habit in creeping phlox. After the plant finishes flowering, it is advisable to trim back the stems.

This process not only helps maintain the plant’s overall shape but also stimulates the development of new blooms for the next season. By removing any leggy growth and shaping the plant, you create an environment that promotes optimal blooming.

Gardener with red gloves deadheading or pruning faded blooms of creeping phlox

Photo Credit: Shutterstock.

Another important technique to maximize the blooming of creeping phlox is deadheading. Deadheading involves removing faded blooms regularly. By doing so, you prevent the plant from diverting energy into seed production.

Instead, the plant can focus its resources on producing more flowers and extending the blooming period. Deadheading also helps maintain a neat appearance in your garden, as it eliminates unsightly spent flowers.

Feeding your creeping phlox with a bloom-boosting fertilizer is a proactive measure to ensure abundant flowering. It is recommended to apply the fertilizer in early spring, providing the necessary nutrients for vigorous growth and profuse blooming.

When selecting a fertilizer, opt for one with a higher phosphorus content. Phosphorus is an essential element for flower production and will help promote the development of vibrant blooms.

Proper light exposure is crucial for creeping phlox to bloom to its full potential. Ensure that your plant receives adequate sunlight, as it plays a vital role in the blooming process. Insufficient light can lead to reduced flowering or even no flowering at all.

Creeping phlox on the edge of a stone wall with purple flowers

Photo Credit: Shutterstock.

Therefore, it is important to position your creeping phlox in a sunny spot where it can receive at least six hours of direct sunlight per day. By providing the right amount of light, you create favorable conditions for the plant to thrive and produce an abundance of beautiful blooms.

Common Pests, Plant Diseases, and Plant Problems for Creeping Phlox

One of the reasons creeping phlox is favored by gardeners is its ability to withstand various environmental conditions. It is drought-tolerant and can thrive in full sun to partial shade. However, despite its resilience, creeping phlox is not completely immune to problems.

Phlox bugs, scientifically known as Adelgidae, are one of the common pests that can affect creeping phlox. These tiny insects feed on the sap of the plant, causing distorted growth and yellowing leaves. If left untreated, they can severely weaken the plant.

To control phlox bugs, you can use insecticidal soap or organic insecticides. Regularly inspect your creeping phlox for any signs of infestation and take action promptly to prevent further damage.

In wet, humid weather, these plants are also susceptible to foliar nematodes. Nematodes cause brown and then black lesions on the leaves of plants. These soil organisms are difficult to manage. As a result, diseased plants must be removed and destroyed, and the ground must be kept clear of debris.

Another issue that creeping phlox may encounter is root rot. This fungal disease occurs when the roots are constantly exposed to excessive moisture due to overwatering or poorly draining soil. The first sign of root rot is wilting leaves, which may eventually turn yellow or brown. A distinct rotten smell from the roots is also an indication of this problem.

To prevent root rot, ensure proper drainage by amending the soil with organic matter and avoiding overwatering. It is important to strike a balance between providing enough moisture for the plant’s needs and preventing waterlogged conditions.

Powdery mildew is a common fungal disease that can affect creeping phlox, especially in humid environments with poor air circulation. This disease appears as a white, powdery coating on the foliage, giving the plant a dull and unhealthy appearance. If left untreated, powdery mildew can weaken the plant and inhibit its growth.

Macro shot of white spots on Phlox leaves caused by powdery mildew

Photo Credit: Shutterstock.

To control powdery mildew, remove affected leaves and treat the plant with a fungicide if necessary. To prevent the disease from occurring, provide adequate spacing between plants to allow for good air movement and reduce humidity levels.

Spacing and overcrowding can also contribute to the overall health and well-being of creeping phlox. When plants are too close together, air circulation is restricted, creating a favorable environment for pests and diseases to thrive. Additionally, overcrowded plants may compete for nutrients and water, leading to reduced blooming and overall vigor.

To avoid these problems, make sure to space your creeping phlox adequately when planting. This will not only promote better airflow but also allow each plant to receive the necessary resources for optimal growth.

Other Guides from Planet Natural:

30 Best Ground Cover Plants (Low-Maintenance Options)

Top Low-Maintenance Grass Alternatives for Your Backyard

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