Lettuce Fertilizer

Home » Hydroponics » Hydroponic Lettuce Nutrient Guide: Optimal EC, PPM, pH & Fertilizer Ratios Last Updated: August 07, 2026 | Reviewed for accuracy, clarity, and safety Quick Answer: During the initial germination and seedling stage, young roots are highly sensitive to salt accumulation. Limit nutrient strength to an EC of 0.6 to 0.8 mS/cm (300 to 400 PPM on the 500 scale) as soon as the first true leaves emerge. This dilute solution prevents osmotic shock while providing the nitrogen and phosphorus needed for early root system architecture. ⏱️ Time: 30 Minutes 💪 Difficulty: Beginner 💰 Est. Cost: $50 – $150 💡 Key Term Hydroponic lettuce refers to a…