To add to your gardening theme. Put soil and seeds in the sensory table. At night cover the table and the seeds will begin to sprout roots.
In the spring we did a unit on seeds. In our water table we put flax seeds in. Some light brown some dark brown. In one side it was just seeds and on the other side we put the flax seed with water, it is a great texture and becomes very slimy overnight. The kids will love this! Also we added some funnels (will go through very easily )along with various different shovels and spoons. Great for kids who love to get their hands dirty!