In Indonesian, Horticulture is one part of agriculture that is very important for the survival of the Indonesian people. Crops are useful to meet people's food needs. The cultivation of agriculture crop very dependent on climate, weather and external factors. The optimal environment will provide optimal plant growth results, so people must really pay attention to the condition of these crops. To maintain plant growth so that crops can grow well, it is necessary to monitor the crops. To find out how plant growth, which needed a system to monitor plant growth. This paper will discuss about the implementation of a plant growth monitoring system. This system will check the climate, weather, and external factors like air, soil, light, and others, which will affect the crops. Internet of Things (IoT) assumes a significant job in a large portion of the fields. The utilization of IoT expanded in view of the different preferences we can get from that. The horticulture is where a great deal of progress is required because that is one of the fundamental needs and a huge area of individuals is associated with that. All this information is sent by Arduino Uno dev boards to the Ubidots IoT (Internet of Things) cloud platform. Data in Ubidots will be sent to the user's smartphone. [ABSTRACT FROM AUTHOR]