MASHKI clay pebbles starting your seeds a try using . You can crush the medium to increase saturation or you can keep them whole, use small net pots, and cover the seed with a couple of pebbles. It seems like you might be referring to the use of clay balls or clay pebbles in gardening. These are often used in hydroponics and aquaponics systems, as well as in traditional potted plant arrangements. Here are ten possible uses for clay balls in gardening Improved Aeration: They enhance soil aeration when mixed into regular potting soil, preventing compaction and improving root health. Soil Amendment: Clay balls can be mixed into garden soil to help break up heavy clay soil, improving drainage and root development.