Wheat flower opens when self-pollination fails. The unfertilized ovary pushes the palea and lemma apart by increasing radial size associated with cell enlargement and suppression of pericarp degradation, therefore facilitating cross-pollination.

Three biostimulators are applied on stockplants (named Prunus mahaleb 'GF 8-1', Prunus mahaleb 'Egervár' and Prunus mahaleb 'Bogdány') three times before taking cuttings. Kelpak® (brown kelp extract) contains auxin-like and cytokininlike substances. Wuxal Ascofol® is a leaf fertilizer with seaweed extract. There is 5-aminolevulic-acid in Pentakeep®-V, which increases chlorophyll-content in leaves. Control stockplants remained untreated. Five growth regulators are applied on cuttings. Except for the above three biostimulators Yeald Plus®, and benzyladenine was sprayed onto the leaves of cuttings, one week after cuttings were inserted into the cell trays. Control and stockplants were not treated when biostimulators were applied on cuttings. The treatments were applied once a week during four weeks. The cuttings of 'GF 8-1' were soaked at first treatment in solution of given growth regulator. On each treatment IBA was used in rate 0.2% in 50% ethanol solution for 5 seconds except for control. The cuttings of 'Egervár' were treated without soaking only spraying; and the cuttings of 'Bogdány' were treated both methods separately. The rooting period has been taking for six weeks. On stockplants number and weight of shoots and cuttings, the leaf chlorophyll content and the number of rooted cuttings are measured. Number of rooted cuttings, the roots' and shoots' fresh and dry weight are measured. The number of new shoot under rooting period was counted. Kelpak® and Wuxal As-cofol® increase the shoots' number and weight, cuttings' weight. This means that the shoots of treated stockplants reach earlier the optimum size and quality for cutting. Kelpak® on stockplants resulted at both cultivars the highest rooting rate and cutting quality. Kelpak® by soaking at treated cuttings was the most effective at 'GF 8-1' and 'Bogdány'. Kelpak®, Pentakeep®-V and Yeald Plus® by spraying had given the best results at 'Egervár'. Pentakeep®-V treatment by spraying was better comparing control.

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