Oyama MagnoliaÂ
Magnolia sieboldii
Other Names: Siebold Magnolia, Korean Mountain Magnolia
Plant Details
USDA Plant Hardiness Zones:Â 4a-8b (4a-9b in cool-summer climates)Â Â Find Your ZoneÂ
Plant Type:Â Flowering Large Shrub or Small Tree
Height at Maturity:Â 10-15′
Width at Maturity:Â 10-15′
Spacing:Â 18’+ for space between trees
Growth Habit / Form:Â Upright, Vase shaped
Flower Color: Â White with Red stamens
Flower Size:Â 4″
Flowering Period:Â Mid Spring into Summer
Flower Type:Â Single
Fragrant Flowers:Â YesÂ
Foliage Color:Â Green
Fragrant Foliage:Â No
Sun Needs:Â Full Sun or Mostly Sun in cool-summer climates, Morning Sun with Afternoon Shade or Filtered Sun in hot-summer climates
Water Needs:Â Â Average
Soil Type:Â Â Clay (well-drained), Loam, Sand (amend quick draining soil to retain moisture), SiltÂ
Soil Moisture / Drainage:Â Moist But Well Drained
Soil pH:Â 4.5 – 6.0 (Acid to Moderately Acid)
Maintenance / Care:Â Low
Attracts:Â Visual Attention
Resistances:Â Deer, Insect
Description
 An uncommon species of great beauty, Magnolia sieboldii, commonly know as Oyama Magnolia, is a large shrub or small tree that grows to about 15 feet tall and wide beneath the forest’s larger trees in its native habitat of Japan, which makes it a superb selection for woodland borders and other partially shaded settings in the home landscape. We hear it will thrive in full sun in cool-summer climates. In late spring to early summer, and sporadically through the rest of summer, egg-shaped white buds open to display truly picturesque, wonderfully fragrant, slightly nodding, bowl-shaped flowers with white petals surrounding a prominent ring of rose-red stamens. Following the flowers are carmine colored fruits that contrast beautifully with the golden fall foliage. Sure to be a conversation piece in the garden, Oyama Magnolia is easy-easy-to-grow, hardy and long-lived. We’ve seen no serious problems with pests or disease and the deer turn their nose up to it.
Landscape & Garden Uses
Growing 10 to 15 feet tall and equally as wide, the Oyama Magnolia is ideal for use as a large specimen shrub or small tree in partially shaded landscape and woodland borders. Plant near outdoor sitting and living spaces where the beautiful flowers and wonderful fragrance can be enjoyed from close up. A fine addition to white theme gardens, fragrance gardens and the cottage garden.
Growing Preferences
Oyama Magnolia is easy to grow in most any moist but well-drained acidic soil of average fertility, including well-drained clay, and part shade, though it is said to tolerate full sun in cool-summer climates. In hot-summer climates it will appreciate some filtered sun or shade during the afternoon hours. Though many websites list it as cold hardy to USDA Zone 6a, we’ve heard from a reliable source that it has tolerated winters in Zone 4 with no problems. Avoid constantly soggy or wet soils. In alkaline soils, apply soil sulfur and/or chelated iron to increase acidity for deep greening of foliage and heavier flowering. Pruning usually isn’t necessary however stray or damaged branches can be pruned after flowering. Feed in spring with a mild organic plant food or a well-balanced shrub and tree food containing iron and/or sulfur.
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