Add a few drops of liquid fertilizer to the bowl of water, and soak the conifers' roots for 5 minutes.
Cover the container's holes with a fine screen to retain the soil and prevent clogging.
Fill the bottom of the container with a layer of the bonsai soil mix.
Spread the roots of the conifer, and place the plant on the soil. Gently press soil over the roots. Continue adding plants, and cover the roots with more soil. Use a chopstick to gently tap around the plants' roots to fill pockets with soil.
Add a decorative rock. Cover the soil with gravel and sheet moss to keep water from evaporating.