Kuris, A., Division of Medicinal and Spice Crops, Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Israel
Altman, A., Department of Horticulture, Hebrew University of Jerusalem, Rehovot, Israel
Putievsky, E., Division of Medicinal and Spice Crops, Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Israel

Stem cuttings of 3 Labiatae spices, oregano (Origanum vulgare L.), peppermint (Mentha piperita L.) and balm (Melissa offinicalis L.) were analyzed for their rooting- patterns and initial establishment under controlled conditions. Approximately 100% of cuttings from all 3 species rooted, but the number of roots per cutting varied in the order: oregano 〉 balm 〉 peppermint. Treatment of cuttings with IBA, IAA and Hormex increased both the number of roots per cutting and the rate of root formation in all 3 species. This effect was, however, dependent on their natural capacity for root formation, with the greatest effect on the slowest root producer, balm, where root number increased 3-fold. Enhanced root formation was reflected in increased fresh-weight accumulation by both root and shoot systems. Hormone treatment also increased shoot length of peppermint. All the above mentioned effects were concentration-dependent. Thus, hormonal treatment of cuttings of these 3 Labiatae spices clearly aided early establishment, and especially so in cuttings which were initially less vigorous. © 1980, All rights reserved.