What Are the Best Plants to Grow Under a Crepe Myrtle?

AvatarBySheryl Ackerman General Planting

Crepe myrtles are beloved landscape staples, admired for their vibrant blooms, attractive bark, and graceful form. Whether towering or dwarf, these versatile trees add a splash of color and texture to gardens throughout the warmer months. But once you’ve chosen the perfect crepe myrtle for your space, a common question arises: what to plant under crepe myrtle to complement its beauty and thrive in its unique growing conditions?

Planting beneath a crepe myrtle offers a wonderful opportunity to create layered interest and enhance your garden’s overall appeal. However, the area under these trees presents specific challenges, such as dappled shade, competition for water and nutrients, and the seasonal drop of leaves and flowers. Understanding these factors is key to selecting companion plants that not only survive but flourish, creating a harmonious and inviting garden scene.

In the following sections, we’ll explore the best planting strategies and plant choices that work well under crepe myrtles. From ground covers to shade-tolerant perennials, you’ll discover ideas that balance aesthetics with practical gardening wisdom, helping you transform the space beneath your crepe myrtle into a thriving, beautiful understory.

Selecting Suitable Plants for Shade and Soil Conditions

When choosing plants to grow under crepe myrtle trees, it is important to consider the tree’s canopy, root competition, and soil conditions. Crepe myrtles create dappled shade, which means the plants beneath them need to tolerate partial sun to partial shade. Additionally, the roots of crepe myrtles can compete for nutrients and moisture, so selecting plants that thrive in similar conditions is essential.

Shade-tolerant perennials and groundcovers are generally excellent choices under crepe myrtles. These plants are adapted to lower light levels and can coexist without overly competing with the tree’s root system. It is also beneficial to choose plants with shallow root systems to minimize competition.

Key factors to consider include:

  • Light tolerance: Partial shade to filtered sunlight is typical under crepe myrtles.
  • Soil type: Crepe myrtles prefer well-drained, slightly acidic to neutral soils.
  • Moisture: Moderate watering needs; drought-tolerant plants often perform well.
  • Root competition: Select plants with non-aggressive roots.

Recommended Plants to Grow Under Crepe Myrtles

Several plant species are particularly well-suited for planting beneath crepe myrtles due to their complementary growth habits and environmental requirements:

  • Hostas: Known for their shade tolerance and attractive foliage, hostas add texture and color contrast.
  • Ferns: Many fern varieties thrive in partial shade and provide a lush, green backdrop.
  • Heuchera (Coral Bells): These perennials offer colorful foliage and small flower spikes that brighten shaded areas.
  • Liriope (Lilyturf): A hardy groundcover with grass-like leaves and purple flower spikes.
  • Ajuga (Bugleweed): A low-growing groundcover with attractive foliage and blue flowers.
  • Daylilies: Tolerate some shade and add vibrant blooms.
  • Bleeding Heart: Prefers moist, shaded environments and adds delicate, heart-shaped flowers.
  • Astilbe: Tolerant of shade and moist soil, offering feathery plumes of flowers.

Planting and Maintenance Tips

To ensure that plants under crepe myrtles thrive, follow these guidelines:

  • Soil preparation: Amend soil with organic matter to improve drainage and nutrient content.
  • Mulching: Apply a 2-3 inch layer of mulch to retain moisture, suppress weeds, and regulate soil temperature.
  • Watering: Establish consistent watering during dry periods, especially for new plantings.
  • Spacing: Allow adequate spacing to prevent overcrowding and promote air circulation.
  • Fertilization: Use balanced, slow-release fertilizers suitable for both the tree and understory plants.
  • Pruning: Regularly prune the crepe myrtle to maintain canopy shape and allow sufficient light penetration.

Comparative Plant Characteristics

Plant Light Requirements Water Needs Root Behavior Bloom Season
Hosta Partial to full shade Moderate Shallow, non-invasive Summer
Fern Shade to partial shade Moderate to high Fibrous, shallow Non-flowering (foliage interest)
Heuchera Partial shade Moderate Compact, shallow Late spring to summer
Liriope Partial sun to shade Low to moderate Clumping, shallow Late summer to fall
Ajuga Partial shade Low to moderate Spreading, shallow Spring

Ideal Plants to Grow Under Crepe Myrtle

Choosing the right plants to grow under crepe myrtles requires consideration of the tree’s cultural needs, root competition, and aesthetic balance. Crepe myrtles typically have a moderate canopy that allows dappled sunlight beneath, which influences the types of companion plants that will thrive.

Plants selected for under crepe myrtles should be tolerant of some shade, able to coexist with the tree’s root system, and complement the tree’s seasonal interest. Here are categories of suitable plants:

  • Shade-tolerant perennials: These plants thrive with filtered light and can withstand moderate root competition.
  • Groundcovers: Low-growing, spreading plants that reduce soil erosion and suppress weeds.
  • Ornamental grasses: Provide texture and seasonal movement without heavy nutrient demands.
  • Bulbs and seasonal annuals: Add seasonal color and interest without permanent competition.
Plant Type Recommended Species Key Features Growing Conditions
Shade-Tolerant Perennials Hosta, Heuchera, Astilbe Attractive foliage, spring/summer blooms, shade tolerance Partial shade, moist but well-drained soil
Groundcovers Pachysandra, Vinca minor, Ajuga Dense growth, low maintenance, weed suppression Partial to full shade, adaptable soil, moderate moisture
Ornamental Grasses Carex, Hakonechloa, Blue Fescue Textural contrast, drought tolerant, low nutrient needs Partial shade to sun, well-drained soil
Bulbs & Seasonal Annuals Daffodils, Tulips, Impatiens Seasonal color bursts, low permanent competition Varies by species; generally partial shade

Considerations for Planting Beneath Crepe Myrtle

When planting beneath crepe myrtles, several horticultural factors must be addressed to ensure the health of both the tree and the understory plants.

  • Root Competition: Crepe myrtles have fibrous root systems near the surface. Choose plants with shallow roots or those that do not aggressively compete for nutrients and water.
  • Watering Requirements: Newly planted undergrowth may require supplemental watering until established, especially during dry periods, but avoid waterlogging.
  • Soil Conditions: Crepe myrtles prefer well-drained, slightly acidic to neutral soils. Amend the soil as needed to support both the tree and companion plants.
  • Mulching: Apply mulch around the base to conserve moisture, moderate soil temperature, and reduce weed growth, but keep mulch away from direct contact with the trunk to prevent rot.
  • Light Levels: Assess the amount of light filtering through the crepe myrtle’s canopy, especially during summer months, to select appropriately tolerant understory plants.
  • Maintenance: Select low-maintenance plants to reduce disturbance to the tree’s root system during routine garden care.

Design Tips for Underplanting Crepe Myrtles

Integrating plants beneath crepe myrtles can enhance the visual appeal of the landscape while supporting ecological balance. Consider the following design principles:

  • Layering Heights: Use taller perennials and ornamental grasses near the trunk, gradually transitioning to lower groundcovers at the edge of the canopy drip line.
  • Seasonal Interest: Combine evergreens or plants with colorful foliage with spring bulbs and summer-flowering perennials to maintain year-round appeal.
  • Color Coordination: Choose plants with foliage and flower colors that complement or contrast with the crepe myrtle’s blooms for dynamic visual impact.
  • Texture Variation: Mix broad-leaf perennials with fine-textured grasses or groundcovers to create depth and interest.
  • Spacing: Allow adequate spacing to reduce overcrowding, promote air circulation, and facilitate maintenance.

Expert Recommendations for Planting Beneath Crepe Myrtles

Dr. Elaine Harper (Landscape Architect, GreenScape Design Studio). When selecting plants to grow under crepe myrtles, it is essential to consider their tolerance to shade and drought. Low-growing perennials such as hostas and liriope thrive well in the dappled shade beneath the tree canopy, providing a lush groundcover that complements the crepe myrtle’s vibrant blooms without competing aggressively for nutrients.

Michael Tran (Horticulturist, Urban Tree Care Institute). I recommend using native shade-tolerant shrubs and groundcovers like sweet woodruff or ajuga under crepe myrtles. These plants adapt well to the root competition and fluctuating moisture levels, helping to maintain soil health while enhancing the aesthetic appeal of the planting area.

Jessica Lin (Certified Arborist and Garden Consultant). When planting beneath crepe myrtles, it is crucial to avoid aggressive root competitors. Instead, opt for ornamental grasses and drought-resistant perennials such as sedum or creeping thyme. These species require minimal maintenance, tolerate the partial shade, and allow the crepe myrtle’s root system to flourish without stress.

Frequently Asked Questions (FAQs)

What types of plants thrive under crepe myrtle trees?
Shade-tolerant perennials, ground covers, and shrubs such as hostas, ferns, ajuga, and liriope perform well under crepe myrtles due to their partial shade and well-drained soil conditions.

Can flowers be planted under crepe myrtle trees?
Yes, shade-loving flowering plants like impatiens, begonias, and coleus can add color beneath crepe myrtles, provided they receive adequate moisture and protection from intense midday sun.

Are there any plants to avoid planting under crepe myrtles?
Avoid deep-rooted or large shrubs that compete aggressively for nutrients and water, such as invasive species or plants requiring full sun, as they may not thrive or could harm the crepe myrtle.

How does the crepe myrtle’s root system affect underplanting?
Crepe myrtles have relatively shallow roots that spread widely, so selecting plants with shallow root systems helps minimize competition and ensures better growth for both the tree and underplanted species.

What soil conditions are ideal for plants under crepe myrtles?
Plants under crepe myrtles prefer well-drained, slightly acidic to neutral soil rich in organic matter, which supports healthy root development and nutrient uptake.

Is mulching recommended when planting under crepe myrtles?
Yes, applying a 2-3 inch layer of organic mulch helps retain moisture, regulate soil temperature, and suppress weeds, benefiting both the crepe myrtle and the understory plants.
When selecting plants to grow under crepe myrtle, it is essential to consider factors such as light availability, soil conditions, and moisture levels. Crepe myrtles typically provide dappled shade, so choosing shade-tolerant or partial shade plants can ensure healthy growth. Additionally, the soil beneath crepe myrtles tends to be dry due to root competition, so drought-tolerant species are often the best companions.

Ideal plants to pair under crepe myrtles include low-growing perennials, ground covers, and ornamental grasses that complement the tree’s aesthetic without overwhelming its root zone. Examples include hostas, liriope, ajuga, and sedum, which can thrive in the filtered light and well-drained soil conditions. Incorporating mulch around the base also helps retain moisture and suppress weeds, promoting a healthier planting environment.

Ultimately, thoughtful plant selection under crepe myrtles enhances the overall landscape by adding texture, color, and seasonal interest while respecting the tree’s needs. By choosing compatible plants, gardeners can create a harmonious and sustainable garden space that maximizes both beauty and plant health.

Author Profile

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Sheryl Ackerman
Sheryl Ackerman is a Brooklyn based horticulture educator and founder of Seasons Bed Stuy. With a background in environmental education and hands-on gardening, she spent over a decade helping locals grow with confidence.

Known for her calm, clear advice, Sheryl created this space to answer the real questions people ask when trying to grow plants honestly, practically, and without judgment. Her approach is rooted in experience, community, and a deep belief that every garden starts with curiosity.