An educational awards program of the Elisabeth Carey Miller Botanical Garden

Magnolia sieboldii

Oyama magnolia

Image © Lynne Thompson/Great Plant Picks

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Outstanding Qualities Oyama magnolia is a superb plant for the woodland as it is accustomed to growing beneath the forest’s larger trees. Its splendid flowers are produced through May and June, with a trickle of blossoms through the rest of summer. The nodding flowers emerge from egg-shaped buds; a peek inside them reveals their rose-red stamens – and a sniff reveals their fragrance. The oval fruits turn carmine in autumn and are ornamental against oyama magnolia’s golden fall foliage. Combine Oyama magnolia with other woodland shrubs, such as Enkianthus campanulatus ‘Red Bells’, Fatsia japonica and Mahonia nervosa. Consider also shade-loving perennials such as Carex morrowii ‘Ice Dance’, Dicentra spectabilis ‘Gold Heart‘, Hakonechloa macra ‘Aureola’, Hosta ‘June’ and ‘Sum and Substance‘, Polygonatum odoratum var. pluriflorum ‘Variegatum’ and Polystichum polyblepharum.
Culture Oyama magnolia thrives in fertile, humus-rich, well-drained soil and part shade, It does not tolerate poor soil. Water it regularly for its first two growing seasons and during subsequent summer dry spells. Garden gently under magnolias, for they have fleshy roots that can easily be damaged. The best approach for companions plants is to tuck in natural spreaders and let them flourish untouched.
Growing Habit Magnolia sieboldii is a large, vase-shaped, deciduous shrub or small tree. It grows 8 to 10 feet high and wide in ten years and 10 to 15 feet high and wide at maturity.
Hardiness USDA zones 6 to 8