Passive hydroponic system for seedlings

Use this printed bottle connector to connect two bottles mouth-to-mouth. Thread is universal so should work for both plastic soft-drink bottles and screw-cap wine bottles.

Instructions:

1. Cut the top bottle in half and fill with seedling soil or hydroponic medium like clay pebbles. Don't discard the other part off the bottle.

2. Plant the seeds and moisten the soil/medium.

3. Fill the bottom bottle with water and connect the two bottles using the connecter.

4. Use remaining hal