Alert: Limited Online Availability

Now that fall is here, we have limited our stock for online purchase. Find Monrovia plants at your local garden center. Pre-order for 2023 will be available later this year. ×

Alta™ Southern Magnolia

Magnolia grandiflora 'TMGH'

A columnar form that remains upright and tight year after year without pruning. Lustrous dark green leaves have rusty undersides. White, cup-shaped fragrant flowers. Valuable for smaller spaces in urban and suburban landscapes. Evergreen.
There are very few rules in gardening, but perhaps the most important one is to work within your zone. Choosing plants that grow and thrive in your particular climate is the very first step toward having a beautiful garden . Learn More

Good to grow! 7


Full sun

Once established, water deeply when dry.


Due to the seasonal nature of plants, availability at your local garden center is not guaranteed. Give them a call before visiting.

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Botanical Pronunciationmag-NOH-lee-uh gran-dih-FLOR-uh
LoreSouthern magnolia is the state flower of Louisiana and Mississippi. It grows in mixed stands of forest in areas of well drained but evenly moist soils and accessible water table. It is also considered the largest native flower in North America.
Average Size at MaturityVery slow growing to 20 ft. tall, 9 ft. wide in 10 years.
Bloom TimeSummer
Design IdeasSuch a tall narrow evergreen is perfect for gaps between multistory homes and buildings. Stands beautifully against tall walls with no windows to fill in space and reduce glare on institutional structures.. Makes a potential windrow along property lines or try as a pair to flank a vehicular entry. Makes interesting contrast in both form and texture against needled evergreens and trees with seasonal spring and fall color.
Deciduous/ EvergreenEvergreen
Flower AttributeFlowers for Cutting, Fragrant, Showy Flowers
Flower ColorWhite
Foliage ColorGreen
Growth HabitColumnar
Growth RateSlow
Light NeedsFull sun
Patent ActAsexual reproduction of plants protected by the Plant Patent Act is prohibited during the life of the patent.
Special FeatureEasy Care, North American Native Selection, Waterwise, Compact Form
Water NeedsLow
Watering NeedsOnce established, water deeply when dry.
Companion PlantsThis beautiful plant works well with Marge Miller Camellia, (Camellia sasanqua 'Marge Miller'), Golden Flare Azalea, (Azalea x 'Golden Flare'), Lady in Red Hydrangea, (Hydrangea macrophylla 'Lady in Red') and Hellikki Rhododendron, (Rhododendron x 'Hellikki'). It's also traditional with Prairie Blue Eyes Top of the Line Daylily, (Hemerocallis x 'Prairie Blue Eyes') and Ruffled Velvet Siberian Iris, (Iris siberica 'Ruffled Velvet').

Follow a regular watering schedule during the first growing season to establish a deep, extensive root system. Watering can be reduced after establishment. Feed with a general purpose fertilizer before new growth begins in spring.

This Plant's Growing Zones: 6-10

USDA Cold Hardiness Zone Map

Your USDA Cold Hardiness Zone: 7

Good to grow!