Knockout Rose vs Southern Magnolia

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

Knockout Rose

Rosa 'Radrazz'

Rosaceae · flowers

Drought TolerantLow Maintenance

Southern Magnolia

Magnolia grandiflora

Magnoliaceae · trees

Deer ResistantLow Maintenance

Hardiness Zone Range

Knockout Rose (Zones 5-10)

Southern Magnolia (Zones 7-10)

Overlap: Both grow in zones 7–10

Detailed Comparison

Feature	Knockout Rose	Southern Magnolia
Scientific Name	Rosa 'Radrazz'	Magnolia grandiflora
Family	Rosaceae	Magnoliaceae
Category	flowers	trees
Sun	☀️ Full Sun	☀️ Full Sun to Part Shade
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained, Acidic
Height	4'	80'
Spread	4'	40'
Bloom Season	Spring-Fall	Late Spring-Summer
Bloom Color	Red, Pink	White
Growth Rate	Fast	Medium
Native Region	Hybrid (US)	Southeastern US
Maintenance	Low	Low

Special Traits

Knockout Rose

No — EdibleNo — Deer ResistantYes — Drought Tolerant

Southern Magnolia

No — EdibleYes — Deer ResistantNo — Drought Tolerant

Care Tips

Knockout Rose

✓Prune by 1/3 in late winter.
✓No spraying needed — highly disease resistant.
✓Deadheading optional but encourages faster rebloom.
✓Feed in spring.

Southern Magnolia

✓Protect from winter winds in northern range.
✓Give space for lower branches to sweep the ground.
✓Leaves are slow to decompose.
✓Large seed pods with red seeds.

Which Plant Is Right for Your Garden?

Choose Knockout Rose if you want a low-maintenance plant, need drought tolerance. It thrives in full sun with medium water in zones 5–10.

Choose Southern Magnolia if you want a low-maintenance plant, and want deer resistance. It thrives in full sun to part shade with medium water in zones 7–10.

Plant them together? Both overlap in zones 7–10. However, they have different sun needs, so plan your garden layout carefully.

View Knockout RoseProfile →View Southern MagnoliaProfile →

Frequently Asked Questions

Can Knockout Rose and Southern Magnolia grow in the same hardiness zone?

Knockout Rose grows in USDA zones 5-10, while Southern Magnolia grows in zones 7-10. Both plants can grow together in zones 7 through 10.

Do Knockout Rose and Southern Magnolia have the same sun and water needs?

Knockout Rose needs full sun and medium water, while Southern Magnolia needs full sun to part shade and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Knockout Rose or Southern Magnolia?

Southern Magnolia grows taller at 80' compared to Knockout Rose at 4'. Southern Magnolia spreads 40' while Knockout Rose spreads 4'.

Are Knockout Rose and Southern Magnolia deer resistant?

Southern Magnolia is deer resistant, but Knockout Rose is not. If deer are a concern, Southern Magnolia is the better choice, or protect Knockout Rose with fencing.

Which is easier to maintain, Knockout Rose or Southern Magnolia?

Both Knockout Rose and Southern Magnolia 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	Knockout Rose	Southern Magnolia
Scientific Name	Rosa 'Radrazz'	Magnolia grandiflora
Family	Rosaceae	Magnoliaceae
Category	flowers	trees
Sun	☀️ Full Sun	☀️ Full Sun to Part Shade
Water	💧💧 Medium	💧💧 Medium
Soil	Well-drained	Rich, Well-drained, Acidic
Height	4'	80'
Spread	4'	40'
Bloom Season	Spring-Fall	Late Spring-Summer
Bloom Color	Red, Pink	White
Growth Rate	Fast	Medium
Native Region	Hybrid (US)	Southeastern US
Maintenance	Low	Low

Care Tips

Knockout Rose

✓Prune by 1/3 in late winter.
✓No spraying needed — highly disease resistant.
✓Deadheading optional but encourages faster rebloom.
✓Feed in spring.

Southern Magnolia

✓Protect from winter winds in northern range.
✓Give space for lower branches to sweep the ground.
✓Leaves are slow to decompose.
✓Large seed pods with red seeds.

Which Plant Is Right for Your Garden?

Choose Knockout Rose if you want a low-maintenance plant, need drought tolerance. It thrives in full sun with medium water in zones 5–10.

Choose Southern Magnolia if you want a low-maintenance plant, and want deer resistance. It thrives in full sun to part shade with medium water in zones 7–10.

Plant them together? Both overlap in zones 7–10. However, they have different sun needs, so plan your garden layout carefully.

Frequently Asked Questions

Can Knockout Rose and Southern Magnolia grow in the same hardiness zone?

Knockout Rose grows in USDA zones 5-10, while Southern Magnolia grows in zones 7-10. Both plants can grow together in zones 7 through 10.

Do Knockout Rose and Southern Magnolia have the same sun and water needs?

Knockout Rose needs full sun and medium water, while Southern Magnolia needs full sun to part shade and medium water. Their differing requirements mean you may need separate garden areas for each.

Which grows taller, Knockout Rose or Southern Magnolia?

Southern Magnolia grows taller at 80' compared to Knockout Rose at 4'. Southern Magnolia spreads 40' while Knockout Rose spreads 4'.

Are Knockout Rose and Southern Magnolia deer resistant?

Southern Magnolia is deer resistant, but Knockout Rose is not. If deer are a concern, Southern Magnolia is the better choice, or protect Knockout Rose with fencing.

Which is easier to maintain, Knockout Rose or Southern Magnolia?

Both Knockout Rose and Southern Magnolia have low maintenance requirements. They need a similar level of care including regular attention to watering, pruning, and soil health.