Let your grandchildren set this up for you.

"Abstract – Plant monitoring is important to ensure the healthiness of the plant. The right moisture and temperature is crucial for the plant to growth. Roses is one of the plant that needs to be monitored closely, such as the healthiest of the leaves, petals of the roses, moisture of the soil and roses environment temperature. This paper implements an embedded system for rose monitoring. The proposed system consist of two main parts: hardware part and software part. The hardware is equipped with temperature sensor, soil moisture sensor, arduino microcontroller and XBee Wifi Module. XBee Wifi Module will act as an intermediate device to communicate the hardware and software. The hardware components will read the water content in the soil and surrounding temperature then wirelessly transfer the reading to interface from laptop. When the water content level is decrease to certain level the software part will alert and this information will be sent to activate the water pump relay. The proposed system manages to read the water content in the soil and environment temperature. The water pump will be activated when the water content in soil is decrease."

See:

https://ir.unikl.edu.my/jspui/handle/123456789/16195

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If you have a greenhouse:

"ABSTRACT

The main objective of this project is to implement a client-server application for soil temperature and humidity control and irrigation control of the flower industry Ecuanrous Ecuadorian, New Roses.SA, due to the fact that at the moment the floricultural plant does not have an automation In their processes for temperature control, which are carried out manually in the collection of information from the greenhouse. For the collection of the information the interview was used to the manager of the flower industry and the person responsible for carrying the data of the greenhouse that found shortcomings to the collection of the information that is carried out daily, monthly and annual. For this reason it is proposed to implement an application to automatize the processes of temperature control and storing the information in a database (All information generated from the greenhouse), thus enabling the floricultural manager to process, store the information and generate appropriate reports to expedite decision-making. "

http://repositorio.uti.edu.ec/bitstream/123456789/374/1/Edwin%20Pa%C3%BAl%20Clavijo%20Toapanta.pdf