Cosmos vs Impatiens

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

Cosmos

Cosmos bipinnatus

Asteraceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Impatiens

Impatiens walleriana

Balsaminaceae · flowers

Low Maintenance

Hardiness Zone Range

Cosmos (Zones 2-11)

Impatiens (Zones 10-11)

Overlap: Both grow in zones 10–11

Detailed Comparison

Feature	Cosmos	Impatiens
Scientific Name	Cosmos bipinnatus	Impatiens walleriana
Family	Asteraceae	Balsaminaceae
Category	flowers	flowers
Sun	☀️ Full Sun	⛅ Part Shade to Full Shade
Water	💧 Low	💧💧 Medium
Soil	Well-drained, Poor	Rich, Moist
Height	5'	1' 6"
Spread	2'	1' 6"
Bloom Season	Summer-Fall	Spring-Fall
Bloom Color	Pink, White, Red	Mixed
Growth Rate	Fast	Fast
Native Region	Mexico	East Africa
Maintenance	Low	Low

Special Traits

Cosmos

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Impatiens

No — EdibleNo — Deer ResistantNo — 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.

Impatiens

✓Keep soil consistently moist.
✓No deadheading needed — self-cleaning.
✓Pinch for bushier growth.
✓Watch for downy mildew — choose resistant varieties.
✓Feed monthly.

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 Impatiens if you want a low-maintenance plant. It thrives in part shade to full shade with medium water in zones 10–11.

Plant them together? Both overlap in zones 10–11. However, they have different sun needs, so plan your garden layout carefully.

View CosmosProfile →View ImpatiensProfile →

Frequently Asked Questions

Can Cosmos and Impatiens grow in the same hardiness zone?

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

Do Cosmos and Impatiens have the same sun and water needs?

Cosmos needs full sun and low water, while Impatiens needs part shade to full shade and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Cosmos or Impatiens?

Cosmos grows taller at 5' compared to Impatiens at 1' 6". Cosmos spreads 2' while Impatiens spreads 1' 6".

Are Cosmos and Impatiens deer resistant?

Cosmos is deer resistant, but Impatiens is not. If deer are a concern, Cosmos is the better choice, or protect Impatiens with fencing.

Which is easier to maintain, Cosmos or Impatiens?

Both Cosmos and Impatiens 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	Impatiens
Scientific Name	Cosmos bipinnatus	Impatiens walleriana
Family	Asteraceae	Balsaminaceae
Category	flowers	flowers
Sun	☀️ Full Sun	⛅ Part Shade to Full Shade
Water	💧 Low	💧💧 Medium
Soil	Well-drained, Poor	Rich, Moist
Height	5'	1' 6"
Spread	2'	1' 6"
Bloom Season	Summer-Fall	Spring-Fall
Bloom Color	Pink, White, Red	Mixed
Growth Rate	Fast	Fast
Native Region	Mexico	East Africa
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.

Impatiens

✓Keep soil consistently moist.
✓No deadheading needed — self-cleaning.
✓Pinch for bushier growth.
✓Watch for downy mildew — choose resistant varieties.
✓Feed monthly.

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 Impatiens if you want a low-maintenance plant. It thrives in part shade to full shade with medium water in zones 10–11.

Plant them together? Both overlap in zones 10–11. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

Can Cosmos and Impatiens grow in the same hardiness zone?

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

Do Cosmos and Impatiens have the same sun and water needs?

Cosmos needs full sun and low water, while Impatiens needs part shade to full shade and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Cosmos or Impatiens?

Cosmos grows taller at 5' compared to Impatiens at 1' 6". Cosmos spreads 2' while Impatiens spreads 1' 6".

Are Cosmos and Impatiens deer resistant?

Cosmos is deer resistant, but Impatiens is not. If deer are a concern, Cosmos is the better choice, or protect Impatiens with fencing.

Which is easier to maintain, Cosmos or Impatiens?

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