Using Hydroton (Leca Expanded Clay Pebbles) to Grow
#0183;#32;Uses of Expanded Leca Clay Pebbles. Use clay pebbles as Seed starter: You can cover the seed with a couple of crushed pebbles in small net pots. The crushing increases saturation. Set the misters to water for 410 seconds after every 23 hours to set out the germination.