Magnolia grandiflora ALTA® ('T.M.G.H.')

Magnolia grandiflora
Magnolia grandiflora ALTA® ('T.M.G.H.')
southern magnolia, bull bay magnolia
SIZE/TYPE taller shrub
USUAL HEIGHT 3-6m
USUAL WIDTH 1-2m
LEAVES evergreen broadleaf
COLOUR OF LEAVES green
FLOWERS showy
COLOUR OF FLOWERS white
BLOOMING TIME July - August
LOCATION full sun
USDA zone (lowest) 6   (down to -23°C)
WINTER PROTECTION  
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Evergreen broadleaf
Summer blooms
Exotics
Magnolias
Hedging plants
náhled fotonáhled fotonáhled foto
Evergreen magnolias are the queens of flowering trees. We choose the most beautiful and at the same time hardiest varieties. ALTA® is a fantastic introduction from the USA where it was found as a chance seedling of a columnar variety called Hasse in 1993. Its inventor Thomas Julian Strickland noticed a plant of a different shape and with and dense, fibrous root system among other Hasse plants and further propagations proved its characteristics to be stable. It was patented in 1998 as TMGH under PP11,612.

ALTA® is a gorgeous southern magnolia of dense habit and narrowly columnar, very elegant shape that looks like a candle flame. From the first hot days of summer large – 20-24 cm across, creamy white, strongly sweet-scented flowers are produced singly and continuously for 2 months or a little longer depending on plant’s age. Evergreen leaves are narrower than on the species, deep green, extremely glossy, covered with rich rusty brown indumentum beneath.

Pruning is not necessary to keep its compact shape. Should you need to cut it in any way do so as early as possible after frosts and beware that it will not flower for one year. As an evergreen, summer-blooming plant it is ideal for planting near swimming pools and patios where you can enjoy summer most. Thanks to its narrow shape and reduced size it can be grown in small gardens, too. ALTA® magnolia exhibits improved root system which ensures safe transplanting and early establishment.

Finding it a good location is a crucial key to healthy life of bull bay magnolias. Ideal spot is the one with plenty of direct sunlight in summer, and in winter protected from cutting winds and constant sunlight. The soil MUST be well-drained, evenlyy moist, and preferably acid to prevent from chlorosis, very rich in humus, possibly with some clay in lower parts. It needs a lot of nutrients so fertilizing is suggested in the first few years after transplanting. Use organic matter or slow-release fertilizers with balanced levels of nitrogen. Solely nitrogen-based solutions are only advisable during regeneration phases and should not be used later than the end of June.

In the USA it proved hardy to USDA zone 6 (-23°C) and is expected to take short spells of a little deeper frost. Should the temperature drop lower than -23°C, or long-lasting frost is forecast we recommend covering it with white woven only for the coldest days FOR MAXIMUM 2 WEEKS. It should be removed during cloudy weather. In winter provide careful watering in frost-free periods if the ground is not dry and not frozen.

Last update 21-02-2012
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Magnolia grandiflora ALTA® ('T.M.G.H.') height 120-140 cm
STANDARD
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Magnolia grandiflora
GLOSSARY
  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
  • HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
  • FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
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