To teach about nourishing the word of God after it has been planted in our hearts (see Alma 32:28–43), draw pictures of two plants—one that is healthy and has moist, rich soil and one that is unhealthy and has dry, poor soil.
(Source: Teaching, No Greater Call, F: Methods of Teaching, Comparisons and Object Lessons)
(One time when I taught the importance of nourishing a testimony, I brought a fan palm that I hadn't been watering into Relief Society and left it in the hallway. At the appropriate time, I brought in the sickly plant and we discussed what the owner (me) could do to take better care of her plant in the future, and applied it to nourishing the seed.)