In this study, the potential to manipulate flower induction in carrot with plant growth regulating chemicals was investigated. 2,2-dichloropropionic acid (2,2-DPA) was shown to strongly promote flowering in environments that were marginal for natural flower induction by reducing the requirement for winter chilling. Using data collected during field and glasshouse trials, models were developed to predict the effects of 2,2-DPA on chilling requirements and the most effective times for 2,2-DPA application in different production environments. It is anticipated that these models will assist producers to effectively use 2,2-DPA in carrot seed production.