Topping Up

Short answer: for a head of lettuce, plan on roughly 1 to 1.5 gallons of solution from seed to harvest (UF/IFAS). Larger, longer-lived plants need much more, and fruiting crops usually need topping up along the way. Why volume matters The Kratky method works best when...

Short answer: air roots are the roots that grow in the humid space between the lid and the falling solution. They take in oxygen from the air, which is how a Kratky plant breathes without an air pump. How they form At planting, the solution touches the bottom of the...