Are red, yellow and orange peppers the same plant?

No. Ripe colour is a genetic property of the cultivar. Red, yellow and orange are separate genotype classes with separate cultivars, while green is a harvest stage — a green-harvested crop still has a genetic ripe colour that is recorded separately.

Crops · Fruiting vegetable

Sweet pepper.

Q: What kind of climate does sweet pepper ask for?

A steady one. The crop is sensitive to the balance between vegetative and generative growth and responds to that balance over weeks rather than days. A climate system that holds a steady relationship between temperature and light holds a steady set; one that swings produces a crop that flushes and then stalls.

A long crop where colour is the product.

Grow sweet peppers under glass The varieties

Start with the end product

A crop with a market.

Greenhouse sweet pepper cultivation manages a branching crop for a specified fruit shape, colour and grade. Rooted plants are trained into stems; crop balance and ripening determine the pattern of harvest.

Shape and use

Bell, pointed and snack peppers have different pack and handling requirements. Specify shape, size, wall quality and defects with the buyer before selecting a cultivar.

Harvest colour

Green peppers are picked before full colour development. Red, yellow and orange ripe colours depend on the cultivar; they are not a universal sequence through which every pepper passes.

A supply plan with peaks

Developing fruit competes with new flowers for the plant’s resources. Fruit set and harvest can come in waves. A stable climate does not by itself create an identical weekly output.

Climate and season

Start with the growing conditions.

Choose the intended harvest period and location before deciding on heating, screens, ventilation or lighting.

Light and crop balance

Leaf area supplies the developing fruit. Fruit load, pruning and the light available affect the next set. More stems can also mean a denser canopy, so a higher count is not automatically a better crop.

Flowering and temperature

The conditions around flowering influence fruit set and development. Avoid treating a temperature setpoint as a complete climate strategy: plant temperature, humidity, ventilation and the season interact.

Root-zone stability

Drip delivery, substrate moisture and nutrient management need to support the crop through changing demand. Plant stress and calcium movement are relevant to fruit disorders; simply adding more fertiliser is not a complete response.

A greenhouse changes the growing environment; it does not remove seasonal limits.

How to cultivate

Support the canopy.
Manage the roots.

The training system and root-zone system are separate choices. Match both to the crop and the people who will work with it.

Trained stems on strings

Select leaders from the branching plant and support them with strings. Stem number, pruning and fruit-load decisions belong together. Two rooted plants with two leaders each are four stems, not four plants.

Substrate, drippers and drainage

A common Dutch arrangement uses substrate slabs on cultivation gutters with drip irrigation. The substrate holds the roots, while the gutter carries the growing system and collects drain water. Water reuse requires storage, treatment and nutrient management.

Alternative canopy systems

Supported, less-pruned canopies are used in other protected-growing systems. They require their own row arrangement, access and fruit-quality assessment. A stem count cannot establish the capacity of an unpruned canopy.

Soil-grown and organic routes

A soil-based plan starts with beds, drainage, soil condition and crop history. Soil-grown peppers still need crop support and irrigation management. Organic status depends on the applicable certified production system; it cannot be inferred from the substrate or greenhouse model.

Fruit set and crop protection

Sweet peppers can self-pollinate, but fruit set also depends on viable pollen, growing conditions and crop balance. Where pollinators are used, their management must fit the protection programme. Scouting, hygiene and compatible biological control remain recurring work.

From layout to cultivation

Put the crop into a programme.

Use the selected layout to organise the next decisions. Dates and expected harvest need a crop adviser and a location-specific plan.

Specify the plants

Agree planting material, delivery stage and the nursery programme. Reserve any on-site space before setting the production layout.

Build the canopy

Check roots, irrigation and supports; train the crop for the selected system. A planting date is not the start of saleable harvest.

Manage set and colour

Prepare the next crop

Include crop removal, cleaning, system checks and replanting. Agree separate compartment programmes where supply needs continuity.

The people and the systems

Make the daily work possible.

Match crop care, harvest and packing capacity to the growing programme.

Build the canopy

Train the selected leaders and manage side shoots and fruit load. The nursery plant specification must fit that stem plan. A stem count is useful for estimating the scope of crop work, not its labour hours.

Cut, grade and pack

Pick to the buyer’s colour and quality specification. Protect fruit from stem punctures and crushing. Fruit that misses the required grade should not be counted as equivalent saleable output.

Move the crop efficiently

Harvest carts, internal transport, sorting and packing can reduce specific handling tasks. Distinguish those operations from automated fruit picking. Packing capacity must be checked against harvest peaks.

What the extra weeks put in the fruit

Sweet pepper is eaten for vitamin C before anything else, and the fruit does not start out carrying it. The pepper reaches full size first and then keeps working. Through the weeks it takes to turn from green to its ripe colour, sugar and vitamin C keep accumulating, and a fruit carried to colour ends up with far more of both than the same fruit cut early. Colour on the shelf is a record of how long the plant was allowed to keep going.

Those weeks are the grower’s side of the bargain. Fruit held for colour occupies plant capacity, heat and light that a green pick would have released, which is why the ripe classes carry a premium and why harvest stage is settled before a greenhouse is designed.

Neither stage improves after cutting. A pepper is picked at the stage it will be eaten at, so time in a container comes off the shelf life rather than adding to the fruit. A greenhouse near its market can hold the crop on the plant until the order is placed and deliver in the same week, in winter as readily as in summer.

Nutrition facts

Sweet pepper, red, raw

Per 100 g

Energy: 26 kcal
Fat: 0.3 g
Carbohydrate: 6.03 g
Sugars: 4.2 g
Fiber: 2.1 g
Protein: 0.99 g
Sodium: 4 mg
Potassium: 211 mg
Vitamin C: 127.7 mg

Source: USDA FoodData Central, FDC 170108

Which sweet pepper?
The commercial classes.

Colour, size and quality at harvest. The class you sell decides the plant load, the harvest rhythm and the greenhouse.

Green Bell Peppers

Green bell pepper is fruit picked before it colours, a harvest stage rather than a colour genotype.

Orange Bell Peppers

Orange bell pepper is its own genotype class with its own cultivars, not a red pepper picked at a different moment.

Red Bell Peppers

Red bell pepper is the reference block pepper of Dutch production, carried on the plant until it colours fully.

Red Pointed Peppers

Red pointed pepper is a conical, elongated sweet pepper sold for its sweetness and for roasting and grilling.

Snack Peppers

Snack pepper is a market and pack idea more than a defined botanical type: small sweet peppers sold in mixed-colour punnets to be eaten whole.

Yellow Bell Peppers

Yellow bell pepper is its own genotype class with its own cultivars, not a red pepper picked at a different moment.

Yellow Pointed Peppers

Yellow pointed pepper is the yellow-ripening conical sweet pepper, distinct from both the yellow block pepper and the red pointed type.

Sweet pepper is a long-cycle crop planted once and carried through most of the year, and its economics turn on ripe colour. A pepper picked green and a pepper carried to red are the same plant doing different amounts of work, and the extra weeks on the plant are paid for in light, heat and fruit that could have been harvested earlier. The choice of harvest stage is therefore a commercial decision made before the greenhouse is designed, not a picking preference settled later.

What the crop needs

The plant is grown on substrate and carried on a high wire, with a slower set and a heavier fruit than cucumber. It is sensitive to the balance between vegetative and generative growth, and it responds to that balance over weeks rather than days. A climate system that holds a steady relationship between temperature and light will hold a steady set; one that swings will produce a crop that flushes and then stalls.

What separates the varieties

Ripe colour is a genetic property of the cultivar, not a harvest choice, and this is the distinction that most often goes wrong in planning. Red, yellow and orange are separate genotype classes with separate cultivars. Green is a harvest stage, and a green-harvested crop still has a genetic ripe colour that has to be recorded separately. Pointed peppers are a different product again, with their own fruit mass and plant architecture, and they are spaced and supported accordingly.

DutchGreenhouses® specifies the structure, climate, screening and irrigation around the pepper type, its harvest stage and the local climate, so the greenhouse supports the colour being sold rather than pepper in the abstract. Get in touch to plan a pepper greenhouse.

The greenhouse behind sweet peppers