What Size Container Do I Need?
The size of the container will vary depending on what type of plant you are trying to grow. If you are interested in growing a lettuce plant, from my successful experience I recommend that you should use a container that holds at least one gallon of nutrient-enriched solution. This one-gallon size is perfect for putting your plant on auto grow mode. You fill the one-gallon container one time with nutrients and leave it to grow, and never worry about refilling the container. Basically, you set it and forget it! Actually, this is the idea behind the Kratky method. You never change or replenish the nutrients in your reservoir. When choosing a container to grow your specific plant you should follow this simple basic rule. For every one foot of plant growth, you will need one gallon of nutrients. For example, if you are growing a tomato plant and the plant height on the seed pack says five-feet, you need a five-gallon container. Many growers on the internet recommend starting the plant in smaller containers and transplanting the plant as it grows bigger in size. I am afraid I have to disagree with this process because you can easily drown your plant. I have used small containers, and when I tried refilling the reservoir of nutrients, I am thinking that I am leaving enough room for air, and I always end up drowning the plant. Yes, you can actually drown your plants. That is why I do not recommend refilling or changing your nutrients. Do some research if you have questions about container size or how to change your Kratky system's nutrients.