Sweet Basil — DutchGreenhouses

Sweet basil, including the Genovese types, is the highest-value fresh herb in most European markets. It is sold as a living potted plant and as cut leaf, and those are effectively two crops: one grown to a finished plant the consumer keeps, the other to a harvested weight destined for a pack.

What the crop needs

Basil is sensitive to cold in a way most greenhouse crops are not, and chilling damage appears on the leaf, which is the product being sold. It also responds strongly to light intensity and spectrum, which makes lighting a larger part of the specification than it is for most greenhouse crops. Whether the crop is cut once or cut and regrown follows from the sale form, and it changes the layout.

What the greenhouse has to do

Potted basil and cut basil are two different buildings. A potted crop is grown to a finished plant the consumer keeps alive, which means pot handling, spacing as the plant grows and a bench or moving-gutter system built for moving pots. A cut crop is grown to a harvested weight and runs on density and a pack line. That decision comes first, because almost nothing carries across.

Both are light-hungry and both are fast, so lighting and turnover dominate the economics. Basil wants warmth and will not tolerate a cold floor, which puts an unusual weight on even heat distribution — a cool corner in a herb house does not grow a slower crop, it grows an unsaleable one. Screening, heating layout and lighting are specified together for that reason.

DutchGreenhouses® designs the structure, climate, lighting and irrigation around the herb, its sale form and the local climate, so the crop matches the shelf it is grown for. Get in touch to discuss a basil project.

Coriander

A fast herb that runs to seed the moment it is held too long.

Parsley

A herb that is cut and comes back, which changes how a house is planned.

Spearmint

Perennial, vigorous, and best given its own channel.

Grow lights

Supplemental light for the low-light months.

Hydroponics

Substrate growing with drip supply and drain recirculation.

The plant that finishes in the kitchen

Sweet basil is sold in two forms, and both are sold on freshness rather than on keeping. The Genovese leaf is soft and bruises where it is handled, and its aroma is strongest in the hours after cutting. What a pack of cut basil is worth depends as much on how long ago it was cut as on how it was grown.

The potted form takes that to its limit. The plant leaves the greenhouse alive and is still growing when it reaches the buyer, who picks it leaf by leaf over the weeks that follow. Nothing about that product survives a long journey. A living plant is heavy, fragile, and running on a clock of its own.

Both forms therefore reward proximity rather than scale. A house near its market can cut in the morning for the same day’s pack, and can send out plants that arrive in a condition to keep growing. Distance is not a cost to be absorbed on this crop. It changes what is being sold.

Nutrition facts

Basil, fresh

Per 100 g

Energy: 23 kcal
Fat: 0.64 g
Carbohydrate: 2.65 g
Sugars: 0.3 g
Fiber: 1.6 g
Protein: 3.15 g
Sodium: 4 mg
Potassium: 295 mg
Vitamin C: 18 mg

Source: USDA FoodData Central, FDC 172232

Questions

Sweet basil, asked and answered

Potted or cut?

They are effectively two crops and two buildings. A potted crop needs pot handling and spacing as the plant grows; a cut crop runs on density and a pack line. Almost nothing carries across.

Does this cover purple or Thai basil?

No. Those are separate types with their own growth habit and market, specified on their own terms.

Why does even heat matter so much for basil?

The crop will not tolerate a cold floor. A cool corner in a herb house does not produce a slower crop, it produces an unsaleable one, so heat distribution is specified with the screening and the lighting rather than after them.

From the knowledge base