We’re doing an experiment I found in a book called 100 Science Experiments by Usborne.
Set up 3 plates with a few layers of paper towels or toilet paper on them. Place a cookie cutters or playdoh cutter on the toilet paper. Then sprinkle seeds inside, and while holding down the cutter, spread the seeds to the sides so they fill the shape. Carefully remove the cutters, then spoon or pour some water on the toilet paper of 2 of the plates. Write dry on the dry one. Put one wet one and the dry one on a window sill, and one wet one in a dark cupboard. We used 2 different kinds of seeds for the wet one, so we have 2 wet and a dry on our windowsill.
Every day, spo0n some water on the plate, but not directly on the seeds. Ask your kid which one they think will grow the best. The one with sunlight or in the dark? The ones with water or dry? Leave it for a week, and the wet, windowsill ones should grow some nice little sprouts in a cool shape!