Summary
The sterility of double-flowered freesia is caused by the abnormal structure of the flower. It proved possible, by cultivation at higher temperatures, to induce fertile single flowers in a double-flowered variety. In winter, under natural light conditions, the most favourable temperature range is 18–20°C.
In this way progeny can be obtained from seed and the application of the usual breeding methods to double-flowered freesias is made possible.
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References
Hartsema, Annie M., 1962. Bloemaanleg en bloei van freesia hybride Buttercup na verschillende temperatuurbehandelingen. Meded. Landbhogeschool 62 (13): 1–26.
Mansour, B. M. M., 1968. Effects of temperature and light on growth, flowering and corm formation in freesia. Meded. Landbhogeschool 68 (8): 1–74.
Sparnaaij, L. D., Kho, Y. O., & Baër, J. 1968. Investigations on seed production in tetraploid freesia. Euphytica 1968: 289–297.
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Baër, J., Kho, Y.O. An investigation into the cause of sterility in double-flowered freesia varieties and the possibility of restoring fertility. Euphytica 20, 493–497 (1971). https://doi.org/10.1007/BF00034203
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DOI: https://doi.org/10.1007/BF00034203