Lagerstroemia in Plant Communities: Ecological Companions

Lagerstroemia, commonly known as crepe myrtle, is a deciduous shrub or small tree celebrated for its vibrant summer flowers, striking bark, and autumn foliage.

Though exotic to Australia, Ozbreed cultivars are drought-hardy, compact, and highly ornamental, making them a reliable choice for urban landscapes needing colour and texture. Crepe myrtles perform well as feature trees, courtyard accents, or street plantings, providing bold colour in the hottest months.

Canopy™

Lagerstroemia spp‘CM02’ PBR Trade Name Canopy™

Vibrant pink flowers, burgundy foliage.

Grande Red™

Lagerstroemia spp ‘CM01’ PBR Trade Name Grande Red™

Compact, red-flowered, drought-hardy tree.

Pinky Pink™

Lagerstroemia spp ‘CM03’ PBR Trade Name Pinky Pink™

Compact, pink-flowered, drought-hardy shrub.

Ecological Role

Crepe myrtles contribute ecological value primarily through their long flowering period. Their blooms attract bees (both honeybees and native species), butterflies, hoverflies, and beetles seeking nectar and pollen during the summer heat when few other trees are flowering.

Nectar-feeding birds such as have been documented visiting Lagerstroemia in Australia, and parrots have been documented feeding upon the dry fruits and seeds.

The insect activity around flowering trees draws insectivorous birds to forage within the canopy. The shedding bark and foliage also offer incidental shelter for predatory insects, spiders, and other beneficial invertebrates. It’s a known host for Lepidoptera (butterflies and moths) overseas, though is not a known host for Australian species as far as I know.

Designing with Guilds

Treat Lagerstroemia as a seasonal colour and pollinator anchor within mixed urban plantings, then layer complementary species to provide a broader range of ecological resources:

• Flowers (nectar & pollen): Crepe myrtle feeds a variety of summer insects. Supplement with complementary successional flowers like Grevillea, Scaevola spp., Chrysocephalum spp., Viburnum spp., Liriope spp., Aloe spp. and camomile for extended nectar and pollen availability across seasons.
• Fruits (for frugivorous birds): Crepe myrtle fruits are dry seed pods accessible only to hard-beaked parrots. Add native fruits such as Rhagodia spinescens, Carpobrotus glaucescens, Dianella caerulea, Hibbertia scandens, Viburbum spp., Rhaphiolepis spp. and Murraya spp. to produce berries and aril-covered seeds.
• Seed: Seeds may not end up being utilised unless parrots such as rosellas or cockatoos decide they’ll have a go. Other large seeds to include for parrots are Hardenbergia violacea and Acacia spp. Integrate native grasses such as Poa poiformis and Cenchrus purpurascens, as well as other small seeds like Chrysocephalm apiculatum and Lomandra spp. to ensure seed resources.
• Habitat / larval hosts: Since Lagerstroemia is not a known host plant for Australian Lepidoptera, add butterfly- and moth-supporting groundcovers and strappy plants such as Lomandra spp., Dianella spp., and Scaevola spp. to complete the insect life cycle.

Specification Summary

• Strengths: Long flowering period in midsummer, vibrant colour, attracts generalist pollinators, compact drought-hardy forms suitable for streetscapes and feature planting.
• Limitations: No direct fruit for birds; parrots often don’t end up using seed pods; not a known larval host plant for Australian Lepidoptera.
• Best Use: As a reliable exotic feature tree or shrub integrated into mixed plant communities where its strong visual presence and warm season pollinator support is balanced by other species providing complementary food and habitat.