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Magnolia soulangiana 'San Jose' Saucer Magnolia
Magnolia soulangiana 'San Jose' Saucer Magnolia

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Zone
Zones 2B, 3-9, 14-24, 31-41
Full SunPartial Sun
Full, Partial
Regular Water
Moderate

Magnolia x loebneri

Magnoliaceae
Deciduous, Trees

MAGNOLIA

Magnolias are magnificent flowering plants featuring blossoms in white, pink, red, purple, or a more recent development, rich yellow. These plants show a remarkable variety of leaf shapes and plant forms. The following text classifies magnolias by general type; the chart lists them alphabetically. New varieties and hybrids appear every year, but distribution is spotty in local nurseries. Many more kinds are available from mail-order specialists.

Magnolias include both evergreen and deciduous types. Most have large, striking blossoms composed of petal-like segments, but a few are grown for use as foliage plants.

For any magnolia, choose planting site carefully—virtually all these trees are hard to move once established. Magnolias never look their best when crowded. Pick a location where the shallow, fleshy roots won’t be damaged by digging or by soil compaction from constant foot traffic. All magnolias may be used as lawn trees; try to provide a good-size grass-free area around the trunk, and don’t plant under the tree.

Magnolias appreciate fairly rich, well-drained, neutral to slightly acid soil amended with plenty of organic matter at planting time. They will grow in somewhat alkaline soil but may develop chlorosis.

At least in the early years, keep a cooling mulch over the root area.

Irrigate deeply and thoroughly, but don’t waterlog the soil or the tree will drown. Only M. virginiana can take constantly wet soil.

Feed trees if new growth is scanty or weak, or if you see significant dieback despite adequate watering and drainage; use a controlled-release product. Treat chlorosis (lack of iron—common in alkaline soils—that shows up as yellowing between leaf veins) with iron chelates.

Leaf damage can result from excess mineral salts in the soil or salts in irrigation water. The latter is a problem in Southern California and, typically, the factor limiting success of magnolias in desert regions. Frequent heavy waterings will help leach out salts and carry them to lower soil levels—as long as drainage is good.

Magnolia x loebneri

Hybrids between M. kobus and M. stellata, these grow slowly to 15 ft, but can reach 50 ft. tall and two thirds as wide. Blooms appear before leaves, can be pink or white. They have narrow, strap-shaped segments similar to thoe of M. stellata, bur with fewer, longer, wider segments. Some selections are fragrant.

'Leonard Messel'

Grows slowly 15 ft. high and wide, but may eventually reach 50 ft. Narrow, strap-shaped flower segments give these the look of M. stellata flowers, but segments are fewer and longer. Deep pink buds open into lighter pink flowers, appearing before leaves in midspring. Lightly fragrant.

'Merrill'

This is a vigorous, free-flowering form with white blossoms.

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