Magnolia trees are versatile landscape plants with hundreds of species and cultivars ranging from dwarf types at 6 to 12 feet up to the towering 80-foot Southern Magnolia, M. grandiflora. With a wide range of bloom times and flower size and color, one can be found to fit every yard and garden. When Do Magnolia Trees Bloom? Flowering occurs according to species and climate with blooms in late winter, spring, summer or autumn. Some varieties bloom more than once for two to three weeks. Others produce flowers before they leaf out. Want more gardening tips? Sign up for our free gardening newsletter for our best growing tips, troubleshooting hacks, and more! What to Know About Magnolia Trees Growing Season Magnolias may be deciduous or evergreen with most evergreen types hardy to zone 7. Evergreen varieties are cultivars of the Southern magnolia, blooming from spring to early summer with large, white flowers continuing sporadically throughout summer. Deciduous and semi-evergreen species and their cultivars grow in zones 3 and higher with a wider range of bloom periods and flower color and size. M. grandiflora 'Little Gem': A dwarf evergreen cultivar, Little Gem blooms in May with a primary flush that continues sparser into July. It's a slow grower maturing at 20 to 25 feet tall and 12 to 15 feet wide. Flowers are creamy white up to 12 inches in diameter. M. grandiflora 'Samuel Sommer': This evergreen variety produces some of the largest flowers up to 14 inches across. A spring flush of creamy, white flowers slows in summer with a second autumn flush in ideal climates. Samuel Sommer matures at 35 to 40 feet with a 20- to 30-foot spread. M. grandiflora 'Edith Bogue': An evergreen cold hardy to -15°F, 'Edith Bogue' thrives in zones 6 to 9. Lemon scented, white blooms appear late spring through early August depending on climate. Trees mature at 40 feet tall with a 30 foot spread. M. virginiana 'Sweet Bay': At heights and spreads of 10 to 35 feet, Sweet Bay magnolia and it's cultivars grow as large shrubs or small trees. Native to the eastern U.S., varieties feature smaller 3-inch, white flowers in May and June. This is a semi-evergreen species with some cultivars evergreen as low as zone 4. M. soulangeana 'Saucer Magnolia': This deciduous magnolia and its cultivars are the most commonly grown varieties. They bloom early from March to mid-April with sporadic flowering through summer. 6-inch flowers open before foliage in white, pink, rose, purple, magenta or burgundy. Mature sizes range from 20 to 25 feet tall and wide. M. stellata 'Star Magnolia': Noted for its compact size and star-shaped, white flowers, this magnolia blooms late winter to early spring. It matures at 10 to 20 feet with an 8- to 15-foot spread. Flowers measure 4 inches across in shades of white, pink and purple. Ideal Growing Conditions for Magnolia Trees to Bloom Review care requirements for specific varieties to ensure they'll flourish and bloom in your climate. Certain cultivars adapt well to wetlands, coastal or urban areas. Here are general growing conditions. Moist, well-draining loam with a slightly acidic pH of 5.5 to 6.5 is ideal. Allow soil to dry out slightly in between watering. Sweetbay magnolias can thrive in boggy soil. The majority of magnolias do not like standing water and become drought tolerant when mature. Water newly planted trees two to three times a week. Plants may require additional watering during bloom periods. For finest flowering, provide six hours of direct sun exposure daily. Some cultivars prefer afternoon shade in hot climates, however the better light you give them, the better they'll bloom. Overall health of your tree depends on its hardiness zones. However, late cold snaps can damage buds and reduce flowering. Ideal temperatures for blooming fall between 60°F and and 75°F. Heat stress at 90°F can reduce flowers and shorten the bloom period. 5 Great Magnolia Trees Care Tips Magnolias make up the largest group of plants in the magnoliaceae family with as many as 340 species and numerous cultivars. These flowering trees and shrubs thrive in diverse environments with a wide range of bloom times, sizes, growth habits and flower color. Do your research and choose a magnolia variety suited to your climate and growing zone. Support flowering by adding compost or well-rotted manure in early spring. Or spread a balanced, slow release formula such as an NPK 10-10-10 out to the dripline. Protect early blooming varieties from late frost which may cause bud and flower loss. Lightly prune after flowering to remove dead or crossing branches. Hard pruning reduces flowering. Spent flowers usually drop making deadheading unnecessary. Mulch to protect shallow roots, retain soil moisture and discourage weeds.




