The invention discloses to a cultivation method for a specimen tree, crape myrtle, which comprises a routine cultivation method with the steps: a. cultivation seedlings; b. inverted planting seedlings, that is, the top end of seedling is downward and the root is upward; c. sprouting and growing of seedlings, that is, new twigs are growing out from the trunks of the inverted seedlings; d. specimenforming, that is, trees are cared and pruned to lead the peripheral diameter of tree branches at the place 450 - 550mm above the ground to be 250 - 350mm and the peripheral diameter of tree branches at the place 800 - 1200 mm above the ground to be 60 - 150 mm; when overall height reaches 2500 to 3500mm, the trees can be sold. The invention has the advantages that: by adopting inversion cultivation method, the growth cycle are greatly shortened with high enjoyment and comparatively high survival rate.