Cosmos vs Crepe Myrtle

Side-by-side plant comparison — which is right for your garden?

Cosmos

Cosmos bipinnatus

Asteraceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Crepe Myrtle

Lagerstroemia indica

Lythraceae · trees

Deer ResistantDrought TolerantLow Maintenance

Hardiness Zone Range

Cosmos (Zones 2-11)

Crepe Myrtle (Zones 7-10)

Overlap: Both grow in zones 7–10

Detailed Comparison

Feature	Cosmos	Crepe Myrtle
Scientific Name	Cosmos bipinnatus	Lagerstroemia indica
Family	Asteraceae	Lythraceae
Category	flowers	trees
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧 Low	💧💧 Medium
Soil	Well-drained, Poor	Well-drained
Height	5'	25'
Spread	2'	15'
Bloom Season	Summer-Fall	Summer
Bloom Color	Pink, White, Red	Pink, Red, White, Purple
Growth Rate	Fast	Fast
Native Region	Mexico	Southeast Asia
Maintenance	Low	Low

Special Traits

Cosmos

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Crepe Myrtle

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Care Tips

Cosmos

✓Direct sow after frost.
✓Don't fertilize — rich soil produces leaves not flowers.
✓Deadhead or let self-seed.
✓Tall varieties may need staking in wind.

Crepe Myrtle

✓Don't 'crepe murder' — avoid topping/severe pruning.
✓Thin interior branches for air flow.
✓Full sun is essential for best blooms.
✓Remove suckers at base.

Which Plant Is Right for Your Garden?

Choose Cosmos if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with low water in zones 2–11.

Choose Crepe Myrtle if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 7–10.

Plant them together? Both overlap in zones 7–10. They share similar sun requirements (full sun), making them potential garden companions.

View CosmosProfile →View Crepe MyrtleProfile →

Frequently Asked Questions

Can Cosmos and Crepe Myrtle grow in the same hardiness zone?

Cosmos grows in USDA zones 2-11, while Crepe Myrtle grows in zones 7-10. Both plants can grow together in zones 7 through 10.

Do Cosmos and Crepe Myrtle have the same sun and water needs?

Cosmos needs full sun and low water, while Crepe Myrtle needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Cosmos or Crepe Myrtle?

Crepe Myrtle grows taller at 25' compared to Cosmos at 5'. Crepe Myrtle spreads 15' while Cosmos spreads 2'.

Are Cosmos and Crepe Myrtle deer resistant?

Yes, both Cosmos and Crepe Myrtle are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Cosmos or Crepe Myrtle?

Both Cosmos and Crepe Myrtle have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.

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Detailed Comparison

Feature	Cosmos	Crepe Myrtle
Scientific Name	Cosmos bipinnatus	Lagerstroemia indica
Family	Asteraceae	Lythraceae
Category	flowers	trees
Sun	☀️ Full Sun	☀️ Full Sun
Water	💧 Low	💧💧 Medium
Soil	Well-drained, Poor	Well-drained
Height	5'	25'
Spread	2'	15'
Bloom Season	Summer-Fall	Summer
Bloom Color	Pink, White, Red	Pink, Red, White, Purple
Growth Rate	Fast	Fast
Native Region	Mexico	Southeast Asia
Maintenance	Low	Low

Care Tips

Cosmos

✓Direct sow after frost.
✓Don't fertilize — rich soil produces leaves not flowers.
✓Deadhead or let self-seed.
✓Tall varieties may need staking in wind.

Crepe Myrtle

✓Don't 'crepe murder' — avoid topping/severe pruning.
✓Thin interior branches for air flow.
✓Full sun is essential for best blooms.
✓Remove suckers at base.

Which Plant Is Right for Your Garden?

Choose Cosmos if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with low water in zones 2–11.

Choose Crepe Myrtle if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 7–10.

Plant them together? Both overlap in zones 7–10. They share similar sun requirements (full sun), making them potential garden companions.

Frequently Asked Questions

Can Cosmos and Crepe Myrtle grow in the same hardiness zone?

Cosmos grows in USDA zones 2-11, while Crepe Myrtle grows in zones 7-10. Both plants can grow together in zones 7 through 10.

Do Cosmos and Crepe Myrtle have the same sun and water needs?

Cosmos needs full sun and low water, while Crepe Myrtle needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Cosmos or Crepe Myrtle?

Crepe Myrtle grows taller at 25' compared to Cosmos at 5'. Crepe Myrtle spreads 15' while Cosmos spreads 2'.

Are Cosmos and Crepe Myrtle deer resistant?

Yes, both Cosmos and Crepe Myrtle are considered deer resistant, making them excellent choices for gardens in areas with deer pressure.

Which is easier to maintain, Cosmos or Crepe Myrtle?

Both Cosmos and Crepe Myrtle have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.