| Summary: | The aim of the study was to assess the post-harvest life of the leaves of <i>Hemerocallis</i> × <i>hybrida</i> ‘Agata’, <i>Limonium latifolium</i>, and <i>Heuchera hybrida</i> ‘Chocolate Ruffles’ after the application of growth regulators from the group of gibberellins (GAs) and cytokinins (CKs), ionic liquids (2-hydroxyethyl)dimethylethylammonium gibberellinate [Chol][Gib] and acetylcholine gibberellinate [Gib][Ach]), as well as quaternary ammonium salts with the gibberellinate anion (1-ethyl quinine gibberellinate [Q-C<sub>2</sub>][Gib]) and 1-dodecyl acetylcholine gibberellinate [Q-C<sub>12</sub>][Gib]). The leaves were conditioned for 4 h in aqueous solutions of benzyladenine (BA), <i>meta</i>-methoxytopolin (MemT) and its riboside (MemTR), gibberellic acid (GA<sub>3</sub>), [Q-C<sub>2</sub>][Gib], [Gib][Ach], [Chol][Gib], and [Q-C<sub>12</sub>][Gib] at concentrations of 50 and 100 mg·dm<sup>−3</sup>. Conditioning of <i>Hemerocallis</i> × <i>hybrida</i> ‘Agata’ with MemT and [Chol][Gib] at both concentrations, [Q-C<sub>2</sub>][Gib] (100 mg·dm<sup>−3</sup>) and [Gib][Ach] (50 mg·dm<sup>−3</sup>), extended the vase life of the leaves by 7–9 days. The application of [Gib][Ach] (50 and 100 mg·dm<sup>−3</sup>) and [Q-C<sub>12</sub>][Gib] (100 mg·dm<sup>−3</sup>) resulted in the longest vase life of the leaves of <i>Limonium latifolium</i>. Conditioning of the leaves of <i>Heuchera hybrida</i> ‘Chocolate Ruffles’ with BA, MemT, and MemTR (50 and 100 mg·dm<sup>−3</sup>) extended their vase life by 9.5–51.3 days. BA at a concentration of 100 mg·dm<sup>−3</sup> was the most effective. MemT (50 mg·dm<sup>−3</sup>), MemTR (100 mg·dm<sup>−3</sup>), [Q-C<sub>2</sub>][Gib] (100 mg·dm<sup>−3</sup>), [Gib][Ach] (100 mg·dm<sup>−3</sup>), and [Chol][Gib] (50 mg·dm<sup>−3</sup>) inhibited the degradation of proteins in the leaves of <i>Hemerocallis</i> × <i>hybrida</i> ‘Agata’; [Chol][Gib] (50 and 100 mg·dm<sup>−3</sup>)—in the leaves of <i>Limonium latifolium</i>; all the conditioners except for BA—in the leaves of <i>Heuchera hybrida</i> ‘Chocolate Ruffles’. GA<sub>3</sub>, MemTR, [Gib][Ach], [Q-C<sub>12</sub>][Gib] at both concentrations, [Q-C<sub>2</sub>][Gib], and [Chol][Gib] (50 mg·dm<sup>−3</sup>) inhibited the degradation of chlorophyll in the leaves of <i>Hemerocallis</i> × <i>hybrida</i> ‘Agata’. All conditioners except for [Gib][Ach] and [Q-C<sub>12</sub>][Gib] inhibited chlorophyll degradation in the leaves of <i>Limonium latifolium</i>. All conditioners except for MemT and MemTR (50 mg·dm<sup>−3</sup>) inhibited chlorophyll degradation in the leaves of <i>Heuchera hybrida</i> ‘Chocolate Ruffles’. [Chol][Gib] (50 mg·dm<sup>−3</sup>) was the most effective.
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