Ebb and Flow Hydroponic Systems

Ebb and flow hydroponic systems (sometimes referred to as flood and drain systems) are a fantastic way to grow plants using a moving water source, which is not constantly flowing, as seen in nutrient film technique hydroponic systems.   

The basic principle of ebb and flow hydroponic systems is that of a tidal movement of water around the plants' roots and then back into the reservoir, offering both a feeding and rest period for the plants. 

Above, you can see an example of an ebb and flow hydroponic system where each plant is suspended in a growing medium like rockwool or hydroton. Their roots will then make contact with the hydroponic nutrients in the tray below as the tray is filled with a nutrient solution, either automatically or manually. After a period of time, the nutrient solution is then drained away into a reservoir, ideally to be used again for the next flooding cycle, depending on the setup. 

But why use an ebb and flow system? Why not just have the plants' roots be in constant contact with the nutrient solution? 🤔

Well, every plant has its preferences, and not all plants like being constantly soaked in water, primarily root vegetables. So while ebb and flow is great for most crops, you can allow for greater periods of aeration, which is a benefit for root crops like beets and carrots. 

Video for Understanding Ebb and Flow Hydroponic Systems

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