Abstract
Stock plants of Argeranthemum frutescens `Butterfly' and `Sugar Baby', Brachycome hybrid `Ultra', Helichrysum bracteatum `Golden Beauty', Scaevola aemula `New Wonder', Petunia axillaris hybrids `Purple Sunsport' and `Blue Vein', Sutera cordata `Mauve Mist' and `Snowflake', and Verbena hybrid `Blue' were grown in glass greenhouses under five different temperatures (17, 20, 23, 26, or 29 °C) and a 13-h photoperiod. Cuttings were taken two to three times per week. Total cutting production increased as temperature increased. However, different varieties showed different temperature response patterns. Cutting production in Argeranthmum and Brachycome was relatively insensitive to temperature. For Brachycome, Helichrysum, Scaevola, Petunia, Sutera, and Verbena, cutting production in the 29 °C treatment was double or triple that in the 17 °C treatment. For all tested species, the highest cutting production was in the 29 °C treatment. Although cuttings produced in the 29 °C treatment tended to have a soft stem, rooting was not affected by temperature under which stock plants were grown.
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