The Crop Matron monitors nearby plants in a 9x9x3 area, with the Hydration Cells when available, although these have to be manually added to the Crop Matron.
Seeds, flowers and the like has to be planted on tilled dirt, with a Crops . It is not possible to use bonemeal on the plants. Crossbreeding can occur on tilled dirt with 2 Crops added, it has to be adjacent two plants. Some plants need special conditions to grow, but you should find those on your own.