Oyama Magnolia 'Colossus'

Magnoliasieboldii

Genus
Magnolia (mag-NO-lee-a)
Species
sieboldii (see-BOLD-ee-eye)
Synonym
Sun Exposure
Full Sun
Foliage
Deciduous
Smooth
Height
12-15 ft. (3.6-4.7 m)
Spacing
6-8 ft. (1.8-2.4 m)
Hardiness
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Danger
N/A
Bloom Color
White/Near White
Bloom Time
Late Spring/Early Summer
Other Details
Category
Shrubs
Trees
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Flowers are fragrant
Bloom Size
Other details
Soil pH requirements
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Non-patented
Propagation Methods
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
Seed Collecting
Remove fleshy coating on seeds before storing
Seed does not store well; sow as soon as possible
Regional

This plant is said to grow outdoors in the following regions:

Shawnee Mission, Kansas

Galesburg, Michigan

Great River, New York

Marion, Ohio

Downingtown, Pennsylvania

Easley, South Carolina

Shoreline, Washington

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Featured Videos

Gardener's Notes:

2
positives
1
neutral
0
negative
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B
Easley, SC | November 2018 | positive

This is a wonderful select M. sieboldii form which can grow in the hot & humid conditions of the Deep South if placed in a lightly shaded...Read More

C
ROSLINDALE, MA | January 2015 | neutral

Nodding fragrant globular flowers with a prominent ring of pink stamens, all summer. (After an initial flush, they come in ones and twos....Read More

M
M
Galesburg, MI | September 2011 | positive

Third year in the ground after receiving a 3 ft stick originally. It really took off this year. I have had flowers since early spring, ...Read More

Featured
Red-headed Spider Ant
(Leptomyrmex erythrocephalus)
Common Fiscal
(Lanius collaris)
Featured
Red-headed Spider Ant
(Leptomyrmex erythrocephalus)
Common Fiscal
(Lanius collaris)