Summer 2021 - important noticeWe are now accepting pre-orders for delivery from late August for pot grown trees and December for bare-rooted trees. More>
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As the name suggests Colossus is a vigorous fast-growing Magnolia, featuring large pure white rose-like nodding flowers, with characteristically thick petals and red centres.

Most Magnolias flower quite early in the spring, but Colossus is an unusual summer-flowering variety, flowering over a long period from May to July.

The flowers are also strongly scented.

In the autumn Colossus will often produce strange brown fruits with bright red seeds.

Colossus magnolia for sale

  • 3-year pot-grown tree £59.95
    In a 12L pot
    Large size (3m-5m after 10 years)
You can pre-order now for delivery from late August / early September 2021 for pot grown trees (or late November / early December for bare-root). You do not need to pay at this stage - just add items to the basket and checkout as usual.


Colossus was developed in the 1980s by August Kehr, one of the world's leading Magnolia breeders. One of his particular interests was polyploidy. Whereas most humans, and many plants are diploid - they have two sets of chromosomes - some plants have multiple sets. This characteristic often expresses itself in extra vigour, better disease resistance, larger thicker flowers and so on. One of the parents of Colossus is Genesis, a polyploid Magnolia also developed by Kehr.

Colossus characteristics

  • Gardening skillBeginner
  • AwardsRHS Award of Garden Merit
  • Attractive featuresAttractive flowersScented flowers
  • Growth habitUpright-spreading
  • Height after 10 years3m-5m / 10ft-16ft
  • SunlightPrefers full sun
  • PruningPrune after flowering
  • Growth rateFast
  • Site conditionsSheltered siteFree-draining site
  • Flower colourWhite
  • Flower formSingle flower (5-8 petals)
  • Flowering monthMayJuneJuly
  • Leaf colourGreen
  • Leaf colour - autumnGreen
  • Country of originUnited States
  • Annual cycleDeciduous