Red crispy is the red-pigmented counterpart of the green crispy head, sold wholehead and into mixed-leaf packs where its colour is the reason it is there. Colour intensity is part of the specification, not a bonus, and it develops in response to light rather than to nutrition.
What the crop needs
The crop is short-cycle and hydroponic. It carries the same density and tipburn considerations as green crispy, with the added requirement that the head colours evenly. Light reaching the outer leaf is what drives pigment, so spacing and any shading strategy affect the grade directly rather than only the growth rate.
What the greenhouse has to do
Colour is part of the grade here, and colour is a light response. A red crispy head that finishes pale is downgraded whatever it weighs, so the light plan is specified for pigment development as well as for growth, and the screening strategy has to give the crop the light it needs without the heat load that comes with it.
The rest is dense-head lettuce. The crop turns quickly, so density, the recirculating water system and the harvest route decide annual output. Because a batch is cut as one unit, unevenness across the floor shows up as split colour within a single harvest — which makes even transmission worth more here than in a green type.
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.
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.
Colour that has to arrive
Red leaf carries the raw profile of the family with the anthocyanin pigment on top. Both the vitamins and the pigment sit in a leaf that is eaten uncooked, so nothing is prepared out of them and nothing is put back.
Colour is why the head is bought, and colour is the first thing it loses. Red edges dull and brown as the leaf ages, and a head a few days past its best reads as tired long before it reads as spoiled. In a mixed pack the whole pack is judged on it.
That makes the run to the pack house part of the specification. A crop grown near where it is assembled and eaten arrives with the colour it was cut with, and the pack keeps the contrast it was designed around instead of losing it somewhere in transit.
Nutrition facts
Lettuce, red leaf, raw
Per 100 g
- Energy
- 13 kcal
- Fat
- 0.22 g
- Carbohydrate
- 2.26 g
- Sugars
- 0.48 g
- Fiber
- 0.9 g
- Protein
- 1.33 g
- Sodium
- 25 mg
- Potassium
- 187 mg
- Vitamin C
- 3.7 mg
Red crispy 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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