The height that lettuce can grow in an NFT (Nutrient Film Technique) system can vary depending on the specific lettuce variety, growing conditions, and the duration of growth. However, lettuce typically doesn’t grow very tall in an NFT system compared to other crops.
Most lettuce varieties are considered compact and have a relatively short stature. They are often harvested when they reach a certain size, rather than allowing them to grow to their maximum height. In an NFT system, the focus is usually on growing lettuce for its leaves rather than allowing it to bolt and produce a flowering stalk.
On average, lettuce plants in an NFT system typically reach a height of 20 to 30 centimeters (8 to 12 inches) before they are harvested. At this stage, the outer leaves are usually harvested, and the plant continues to produce new leaves from the center.
It’s worth noting that there are different lettuce varieties available, including compact or mini varieties, as well as larger, more elongated varieties. The specific lettuce variety you choose to grow in your NFT system may affect its height and growth characteristics.
Ultimately, the height at which lettuce grows in an NFT hydroponic system will depend on the specific variety, environmental conditions, and the desired stage of harvest. Regular harvesting and pruning of outer leaves will help maintain the plant’s height and promote continued growth.