My son is two, so he enjoys planting tons of
pea seeds into the same few inches (I give him a pea and then he plants it...usually in the same spot). He also tries to help plant my radish seeds, and takes big pinches and puts them all int the same area...or accidentally dumps the container onto the ground. I've taken to giving him his own container of seeds while I have mine, and then I go back and try to poke in the radish seeds he didn't "tuck in," and move and replant as many of the seeds as I can in the areas where he coated the ground with them.
He also enjoys helping me dig, but usually digs in the wrong place. But, hey, he's interested in the garden, he's learning, he's two, he can't mess things up *that* much, and I can get stuff done while he "helps." He also knows not to dig or play in the gardens once we plant things there, which is a big plus. As he ages, though, there will of
course be higher expectations and responsibilities. But, for now, he's two, and enjoying the wonder of the garden

.