The present invention relates to a method for the preservation of fresh ornamental plant parts, such as cut flowers. More particularly, the invention provides a method of preserving ornamental plant parts having a water content of more than 50 wt.%, said method comprising: ∙ contacting the ornamental plant parts with a preservation medium containing 0.5-97 wt.% of liquefied or supercritical solvent, 1-50 wt.% of dissolved non-volatile organic preservation agent, and 0-92 wt.% of co-solvent, the combination of the solvent, the preservation agent and the optional co-solvent representing at least 80 wt.% of the preservation medium; said medium having a pressure of at least 30 bar; and ∙ recovering the preserved ornamental plant parts. These preserved ornamental plant parts retain their attractive appearance for several weeks or even for several months, without the need of any special attention or care. Another aspect of the invention concerns a preserved cut flower having a fresh appearance, said preserved cut flower containing: having a water content of less than 45 wt.% and containing at least 5 wt.% of a preservation agent selected from diols, triols,polyols and combinations thereof.La présente invention concerne un procédé de conservation de parties de plantes fraîches ornementales, telles que des fleurs coupées. Plus particulièrement, l'invention concerne un procédé de conservation de parties de plantes ornementales ayant une teneur en eau de plus de 50 % en poids, ledit procédé consistant : à mettre en contact les parties de plantes ornementales avec un milieu de conservation contenant de 0,5 à 90 % en poids de solvant liquéfié ou supercritique, de 1 à 50 % en poids d'agent conservateur organique non volatile en solution, et de 0 à 92 % en poids de cosolvant, la combinaison du solvant, de l'agent conservateur et du cosolvant éventuel représentant au moins 80 % en poids du milieu de conservation ; ledit milieu ayant une pression d'au moins 30 bars ; et à récupérer