Plants pictured are 4".
Water: Water when the soil gets slightly dry, do not water when the soil is wet. Ensure the entire root mass is wet when watering.
Fertilize: Bonsai can be fertilized around the year. Use a fertilizer with a balanced nitrogen content to promote further growth.
Location: Outdoor bonsai are best places in a bright spot that is protected from the wind. Indoor trees are best placed in a bright position as well; usually in front of a window facing South.