Abstract. Young plants of the Impatiens walleriana ‘Spellbound Lilac’ and ‘Spellbound Pink Imtrarepu’ were sprayed with GA₃ at the concentrations of 0, 10, 30, 50, 100 and 150 mg·dm^-3. Gibberellic acid affected plant growth. After the application of GA₃ the main and lateral shoots were much longer. Under the influence of GA₃ plants were flowering more abundantly. In the case of GA₃ the number of buds and flowers increased by 57.4-87.8% in comparison to control plants. However, gibberellic acid had an adverse effect on the appearance of plants and resulted in low chlorophyll index in leaves.

The effect of gibberellic acid on growth and flowering
of Impatiens walleriana Hook. from the Spellbound group

Summary

Young plants of the Impatiens walleriana ‘Spellbound Lilac’ and ‘Spellbound Pink Imtrarepu’ were sprayed with GA₃ at the concentrations of 0, 10, 30, 50, 100 and 150 mg·dm^-3.

Measurements of the plants length of main and lateral shoots and the number of buds and flowers were carried out two weeks after application of gibberellic acid.

Gibberellic acid forced plant development. After the application of GA₃ the main and lateral shoots were much longer. Under the influence of GA₃ plants were flowering more abundantly. In case of GA₃ the number of buds and flowers increased by 57.4-87.8% in comparison to control plants. In the case of GA₃ the number of buds and flowers increased by 57.4-87.8% in comparison to control plants. However, gibberellic acid had an adverse effect on the appearance of plants and resulted in low chlorophyll content in leaves.