SmartGardenWatering is an innovative software tool that advises gardeners on watering schedules and watering use. In this paper we investigate how expert and novice gardeners respond to advice from this piece of computer software. Do they readily accept it and adapt their activities accordingly, or do they override it with their own local knowledge? We describe the project to develop the simulation, including the design of the user interface, and a study of 20 gardeners using the tool. The focus of the study was to identify factors in the design of the software that influence how well it might intervene in ongoing gardening practice. The findings focus on what brings confidence or a lack of trust in the underlying horticultural model and its application to a particular garden. Finally, we consider how these findings might inform ongoing development of the software.
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