Azalea vs Black-Eyed Susan

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

Azalea

Rhododendron spp.

Ericaceae · shrubs

Low Maintenance

Black-Eyed Susan

Rudbeckia hirta

Asteraceae · flowers

Deer ResistantDrought TolerantLow Maintenance

Hardiness Zone Range

Azalea (Zones 5-9)

Black-Eyed Susan (Zones 3-9)

Overlap: Both grow in zones 5–9

Detailed Comparison

Feature	Azalea	Black-Eyed Susan
Scientific Name	Rhododendron spp.	Rudbeckia hirta
Family	Ericaceae	Asteraceae
Category	shrubs	flowers
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Rich, Acidic, Well-drained	Well-drained
Height	8'	3'
Spread	6'	1' 6"
Bloom Season	Spring	Summer-Fall
Bloom Color	Pink, Red, White, Purple	Yellow
Growth Rate	Medium	Fast
Native Region	Asia, North America	Eastern North America
Maintenance	Low	Low

Special Traits

Azalea

No — EdibleNo — Deer ResistantNo — Drought Tolerant

Black-Eyed Susan

No — EdibleYes — Deer ResistantYes — Drought Tolerant

Care Tips

Azalea

✓Must have acidic soil (pH 4.5-6.0).
✓Plant high — don't bury root ball.
✓Mulch with pine needles or oak leaves.
✓Never cultivate around shallow roots.

Black-Eyed Susan

✓Deadhead spent blooms to encourage reblooming.
✓Divide clumps every 3-4 years.
✓Tolerates poor soil and drought once established.

Which Plant Is Right for Your Garden?

Choose Azalea if you want a low-maintenance plant. It thrives in part shade with medium water in zones 5–9.

Choose Black-Eyed Susan if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 3–9.

Plant them together? Both overlap in zones 5–9. However, they have different sun needs, so plan your garden layout carefully.

View AzaleaProfile →View Black-Eyed SusanProfile →

Frequently Asked Questions

Can Azalea and Black-Eyed Susan grow in the same hardiness zone?

Azalea grows in USDA zones 5-9, while Black-Eyed Susan grows in zones 3-9. Both plants can grow together in zones 5 through 9.

Do Azalea and Black-Eyed Susan have the same sun and water needs?

Azalea needs part shade and medium water, while Black-Eyed Susan needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Azalea or Black-Eyed Susan?

Azalea grows taller at 8' compared to Black-Eyed Susan at 3'. Azalea spreads 6' while Black-Eyed Susan spreads 1' 6".

Are Azalea and Black-Eyed Susan deer resistant?

Black-Eyed Susan is deer resistant, but Azalea is not. If deer are a concern, Black-Eyed Susan is the better choice, or protect Azalea with fencing.

Which is easier to maintain, Azalea or Black-Eyed Susan?

Both Azalea and Black-Eyed Susan 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	Azalea	Black-Eyed Susan
Scientific Name	Rhododendron spp.	Rudbeckia hirta
Family	Ericaceae	Asteraceae
Category	shrubs	flowers
Sun	⛅ Part Shade	☀️ Full Sun
Water	💧💧 Medium	💧💧 Medium
Soil	Rich, Acidic, Well-drained	Well-drained
Height	8'	3'
Spread	6'	1' 6"
Bloom Season	Spring	Summer-Fall
Bloom Color	Pink, Red, White, Purple	Yellow
Growth Rate	Medium	Fast
Native Region	Asia, North America	Eastern North America
Maintenance	Low	Low

Care Tips

Azalea

✓Must have acidic soil (pH 4.5-6.0).
✓Plant high — don't bury root ball.
✓Mulch with pine needles or oak leaves.
✓Never cultivate around shallow roots.

Black-Eyed Susan

✓Deadhead spent blooms to encourage reblooming.
✓Divide clumps every 3-4 years.
✓Tolerates poor soil and drought once established.

Which Plant Is Right for Your Garden?

Choose Azalea if you want a low-maintenance plant. It thrives in part shade with medium water in zones 5–9.

Choose Black-Eyed Susan if you want a low-maintenance plant, need drought tolerance, and want deer resistance. It thrives in full sun with medium water in zones 3–9.

Plant them together? Both overlap in zones 5–9. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

Can Azalea and Black-Eyed Susan grow in the same hardiness zone?

Azalea grows in USDA zones 5-9, while Black-Eyed Susan grows in zones 3-9. Both plants can grow together in zones 5 through 9.

Do Azalea and Black-Eyed Susan have the same sun and water needs?

Azalea needs part shade and medium water, while Black-Eyed Susan needs full sun and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Azalea or Black-Eyed Susan?

Azalea grows taller at 8' compared to Black-Eyed Susan at 3'. Azalea spreads 6' while Black-Eyed Susan spreads 1' 6".

Are Azalea and Black-Eyed Susan deer resistant?

Black-Eyed Susan is deer resistant, but Azalea is not. If deer are a concern, Black-Eyed Susan is the better choice, or protect Azalea with fencing.

Which is easier to maintain, Azalea or Black-Eyed Susan?

Both Azalea and Black-Eyed Susan have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.