THERMAL REQUIREMENTS DURING THE GERMINATION STAGE IN SOME NEW ORNAMENTAL SPECIES
Temperature level exerted marked influence on mean germination time, while its influence on percentage germination induced smaller often non-significant differences. Exacum affine was shown to be the species requiring the most elevated temperature (25–27 °C) to achieve highest level of germination, while Schizanthus wisetonensis presented highest low-temperature (12–15 °C) percentage germination. The latter species also presented a phenomenon of dormancy induced by high temperatures. For all other species examined optimal temperature lay around 22.5 °C.