Magnolia grandiflora 'EXMOUTH'

Magnolia grandiflora
Magnolia grandiflora  'EXMOUTH'
southern magnolia, bull bay
SIZE/TYPE taller shrub
USUAL HEIGHT 3-6m
USUAL WIDTH 3-4m
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
Magnolias
Summer blooms
Exotics
náhled fotonáhled fotonáhled foto
Evergreen magnolias are the queens of flowering trees. We choose the most beautiful and the hardiest varieties at the same time. Exmouth is a bull bay magnolia developed by John Colliton in Devon, UK, already in the 18th century. However, it seems that it did not spread out much then because at that time French admiral Roland-Michel Barrin of Galissonniére introduced his own variety named after himself in France and some time later it was brought to the UK to decorate aristocratic manors and gardens. It had superior foliage and good hardiness. It took maybe a hundred years that a different sensation was born: magnolia Edith Bogue that survived incredible -31°C in New Jersey, USA. That was a signal for other varieties including Exmouth to be tested under harsher conditions. In the USA it proved hardy to -25°C and became a well selling plant though still a little rare.

Exmouth bull bay magnolia is notably different from her sisters for the leaves. They are thinner but tough, undulated, a little larger, with thinner film of rusty brown hairs on the undersides. Flowers appear from the first hot and sunny days of summer. They are beautiful as on any bull bay magnolia, creamy white in colour, 20-25 cm across, very fragrant. One flower lasts for 1-3 days only but they pop up continuously one by one. Well established, mature plants can produce buds and bloom for as long as 2 months if the weather is sunny and warm.

It grows into a large shrub or a small tree of a rounded conical shape when young and more rounded with age. It does not become a giant but some 6m can be expected. It flowers on mature shoots which are usually the ones from previous year so any form of pruning may significantly limit the number of flowers. Pruning for shaping is not recommended in zone 6, anyway, only if you need to rejuvenate or improved badly branched specimens. As an evergreen, summer-blooming plant it is ideal for planting near swimming pools and patios where you can enjoy summer most.

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, protected from cutting winds, and some shade in winter. The soil MUST be well-drained, constantly moist, and preferably acidic to prevent from chlorosis, very rich in humus and possibly 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 end of June. We strongly recommend using mycorrhizal fungi when transplanting.

It is hardy to about -25°C (USDA zone 6) and has survived -27°C with some burnt foliage. Should the temperature drop lower or long-lasting frost is forecast we recommend covering it with white woven only for maximum of a month or so. 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 17-12-2011; 22-02-2017
SIZES and PRICES
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Magnolia grandiflora height of stem 50-70 cm
STANDARD
CHLUMEC BY CAR
Magnolia grandiflora  'EXMOUTH' height of stem 50-70 cm
STANDARD
CHLUMEC BY POST
Magnolia grandiflora  'EXMOUTH' height of stem 50-70 cm
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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.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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