Leaves of Italian arums were conditioned and kept in vase solution. The conditioning in water solutions of 8-hydroxyquinoline sulphate (8HQS) at concentration of 200 mg‧dm⁻³ and gibberellic acid (GA₃) at concentration of 100 mg‧dm⁻³ lasted for 4 h. Next the leaves were placed in water or in water solutions of benzyladenine (BA) at concentrations of 50 and 100 mg‧dm⁻³. The control consisted of leaves placed in water. The longevity of Italian arums was approx. two weeks. A 4-hour conditioning in gibberellic acid at concentration of 100 mg‧dm⁻³ as well as kept in benzyladenine at concentration of 50 mg‧dm⁻³ extended leaf longevity by 1-2 weeks. The effectiveness of benzyladenine at concentration of 100 mg‧dm⁻³ was only notable after the leaves had been conditioned in a solution of gibberellic acid. Leaf conditioning in an 8HQS solution did not have any effect on their post-harvest longevity except for those which after being conditioned in this preparation were kept in a BA solution at concentration of 50 mg‧dm⁻³. Conditioning of leaves in a solution of gibberellic acid and their kept, without conditioning, in a 50 mg‧dm⁻³ benzyladenine solution inhibited chlorophyll decomposition in them. A drastic loss of weight was recorded in leaves conditioned in 8HQS and kept in water or a BA solution at concentration of 100 mg‧dm⁻³. A considerable weight loss was found to occur in leaves conditioned in GA₃ and kept in water, although it also needs to be emphasized that they retained longevity for over 4 weeks. The smallest weight losses were recorded in leaves conditioned in 8-hydroxyquinoline sulphate and kept in benzyladenine at concentration of 50 mg‧dm⁻³.
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