--- title: "Green Oakleaf Lettuce" description: "Green oakleaf lettuce is a lobed, soft-leaved head grown for leaf shape rather than for weight. Reference values with their Dutch sources, and what the crop asks of a greenhouse." canonical: "https://dutchgreenhouses.com/crops/lettuce/green-oakleaf-lettuce" locale: "en" updated: "2026-08-11" --- # Green Oakleaf Lettuce > Part of: [Lettuce](/crops/lettuce.md) · Provider: [DutchGreenhouses](/) Green oakleaf lettuce carries a distinctively lobed leaf on an open, soft head, grown for leaf shape rather than for mass. The open structure limits inner-leaf problems, while the soft leaf makes handling a larger share of the grade outcome than it is for denser types. Production is short-cycle and hydroponic. Lettuce # Green oakleaf lettuce. A lobed, soft leaf grown for shape rather than for weight. Green oakleaf has a distinctively lobed leaf and an open, soft head. It is grown for leaf shape, which is what it contributes to a mixed pack or a wholehead display, rather than for mass. The softer leaf limits how far it travels well. ## What the crop needs The crop is short-cycle and hydroponic. The open head structure makes it less prone to the inner-leaf problems that affect dense types, but the soft leaf is easily damaged in harvest and packing. Handling is therefore a larger share of the grade outcome than it is for a crispy head. ## What the greenhouse has to do Oakleaf is grown for shape, and shape is easier to damage than weight. The lobed leaf catches on handling and the head does not protect itself the way a dense type does, so the harvest route, the internal transport and the pack area are laid out to move the crop with as few transfers as possible. Cycle and uniformity do the rest. The crop turns many times a year, so density and the recirculating water system decide annual output. A soft, open leaf transpires freely, which helps at the margins but leaves the canopy sensitive to still air, so ventilation and air movement are specified for the whole floor rather than for the average. DutchGreenhouses® designs the structure, climate, screening and irrigation around the lettuce type, its system and the local climate, so cycles turn at the head quality the market grades on. Get in touch to plan a lettuce greenhouse. ## Crop data Green oakleaf lettuce ### Day climate1 Air temperature 21–22.7 °C Relative humidity 60–80 % Daily light integral 11.5–13.2 mol/m²/d CO₂ concentration 1000–1100 ppm ### Irrigation and root zone1 Supply EC 1.6–1.8 mS/cm Supply pH 5.5–6 pH Sources (1) - WUR, 2018, WPR-813 — Lettuce on water under glass with LED E067 Reference values, not a specification. Setpoints are calculated per greenhouse, crop and location. Related ## Other lettuce varieties and the systems behind them ### Butterhead lettuce Soft, loosely wrapped leaves, and the type least tolerant of handling. ### Greenleaf / Batavia lettuce A firmer, more robust head than butterhead, and it travels better. ### Romaine lettuce The upright head, and the tipburn risk that comes with it. ### Hydroponics Substrate growing with drip supply and drain recirculation. ### Climate Heating, cooling, humidity control and carbon dioxide dosing. ## Shape is the product Green oakleaf is a soft green leaf with the raw content of the family, grown for its lobed outline rather than for its mass. The shape is what it contributes to a mixed pack; the eating is what it shares with every other salad leaf. A soft leaf grown for its outline has almost no margin. Lobes catch and tear where they are handled, and the edges go limp before the head does, so the feature the crop exists for is the first part of it to be lost. Every transfer between the cutting and the pack takes a share. Distance is the sum of those transfers. A house near its pack house and its market takes them out of the chain and leaves the leaf whole at the point where it is looked at, which is the only point that matters for a type sold on shape. ### Nutrition facts Lettuce, green leaf, raw Per 100 g Energy 15 kcal Fat 0.15 g Carbohydrate 2.87 g Sugars 0.78 g Fiber 1.3 g Protein 1.36 g Sodium 28 mg Potassium 194 mg Vitamin C 9.2 mg Source: USDA FoodData Central, FDC 169249 Questions ## Green oakleaf lettuce, asked and answered Is head weight or head count the right target? Lettuce is sold by the head, so the count reaching grade in a year decides revenue. A heavier head grown more slowly can earn less than a lighter head on a shorter cycle. Does the cultivar matter more than the type? For head mass, density tolerance and tipburn risk, yes. Those are cultivar properties, which is why a lettuce project is planned around a named cultivar rather than around the type alone. What causes tipburn? Calcium not reaching the fastest-growing leaf margins, driven by transpiration and root pressure rather than by supply. Climate control addresses it; adding calcium to the solution generally does not. 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