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Romanesco broccoliBrassica oleracea

Romanesco is a special cultivar of Brassica oleracea with a unique fractal inflorescence and a more delicate, nutty flavor than cauliflower. It is a heavy feeder and requires plenty of water and nutrients.

Romanesco broccoli (Brassica oleracea): plant portrait for plant portrait - Vegetables, Mustards, Harvest Aug, Sep, Oct, Nov
Romanesco broccoli: plant portrait. harvest: Aug, Sep, Oct, Nov.

Quick profile

Key data

Planting

May, Jun, Jul

Harvest

Aug, Sep, Oct, Nov

Water

high

Good neighbors

CeleryTomatoLettuce

Avoid

Other brassicasStrawberry

Growing data

Romanesco broccoli Growing data

Seed depth

1 - 2 cm

Plant spacing

50 - 60 cm

Row spacing

50 - 60 cm

Germination temp

15 - 22 °C

Sowing and germination

Seed depth1 - 2 cm
Germination temp15 - 22 °C
Germination time6 - 12 days
Seed viability3 - 5 years
Light germinatorNo
Dark germinatorYes
Cold germinatorNo
Stratification neededNo
Pre-soaking recommendedNo
Direct sowing possibleYes
Pre-culture recommendedYes

Planting and spacing

Plant spacing50 - 60 cm
Row spacing50 - 60 cm
Plants per m²3 - 4 per m²
Bed widthfrom 60 cm
Spacing1 per square

Temperature and site

Soil temperature12 - 18 °C
Growing temperaturefrom 8 °C
Optimal temperature16 - 24 °C
Frost sensitiveNo
Late frost sensitiveYes
Heat tolerancemedium
Cold tolerancemedium

Water, nutrients and care

Waterhigh
Critical water phasesEstablishment phase, Heading stage
Watering methodsoil level
Droughthigh
Waterlogging sensitiveYes
Mulching recommendedYes
Nutrient needheavy_feeder
Compost recommendedYes
Fertilizer sensitivitylow

Container, support and growth

Container suitableYes
Pot sizeVolume: from 20 l; Recommended: from 30 l; Diameter: from 40 cm; Depth: from 30 cm
SupportNo
Height40 - 70 cm
Width40 - 60 cm
Root depth30 - 50 cm
Root spread30 - 40 cm
Yield0.5 - 1.5 kg

Year plan

Romanesco broccoli Calendar

All plants
Indoor sowingDirect sowingPlantingHarvest

Indoor sowing

MarApr

Sow in trays at approx. 18°C; move to a cooler spot after germination.

Direct sowing

AprMayJun

Direct sowing only in favorable weather; pre-culture recommended.

Planting

MayJunJul

Harden off before transplanting; plant deep up to the cotyledons.

Harvest

AugSepOctNov

Harvest when the head is firm and tight.

Year plan
  1. Sowing indoors
  2. Transplanting

Growing

Romanesco broccoli Site, soil and care

Spacing

50 - 60 cm

Storage

Fresh storage: In the refrigerator (crisper drawer) wrapped in a damp cloth., Freezing: Divided into florets and briefly blanched, very suitable for freezing.

Pruning

Romanesco broccoli Pruning

not_applicable

Goal

not_applicable

Tools and hygiene

Not applicable for this herbaceous plant.

Companion guide

Romanesco broccoli Companion guide

Companion guide

Good neighbors

CeleryTomatoLettuce

Avoid

Other brassicasStrawberry

Health

Pests, Diseases

Pests

Cabbage white butterfly

Holes in leaves caused by green caterpillars.

Flea beetles

Sieve-like small holes in young leaves.

Diseases

Clubroot

Wilting on sunny days, knotty swellings on the roots.

Deficiencies

Boron deficiency

Hollow stems, brown spots in the head.

Plant health

FAQ

How long does it take for Romanesco to be ready for harvest?

Romanesco is usually ready for harvest 100 to 120 days after sowing, depending on the variety and growing conditions. Harvest when the head is firm and the fractal structure is clearly defined.

Why is my Romanesco bolting?

Romanesco often bolts due to drought stress or excessively high temperatures, especially during head formation. Consistent watering and a cooler location can prevent this.

Can Romanesco be grown in pots?

Yes, Romanesco can be grown in pots, but it requires very large containers (at least 20-30 liters volume) and excellent water and nutrient supply. It is not suitable for small balcony boxes.

What pests most commonly affect Romanesco?

The most common pests are the cabbage white butterfly (caterpillars cause holes in leaves) and flea beetles (small holes in young leaves). Insect meshes are an effective preventative measure.

Related plants

Broccoli

Same familySame crop groupSimilar nutrient needsSimilar water needs

Both are cultivars of Brassica oleracea.

Both are grown for their edible inflorescences.

Cauliflower

Same familySame crop groupSimilar water needs

Both are cultivars of Brassica oleracea.

Both are grown for their edible inflorescences.

kohlrabi

Same family

Both are cultivars of Brassica oleracea.

Clubroot

Shared diseases

All brassicas are susceptible to clubroot.

Cabbage

Similar nutrient needs

All brassicas are heavy feeders and require many nutrients.

Sources

Public sources

  1. Wikidata entity

    Wikidata · 2026-05-15

  2. GBIF species match

    GBIF · 2026-05-15

  3. Wikidata entity

    Wikidata · 2026-05-15

  4. GBIF species match

    GBIF · 2026-05-15

  5. Deutschsprachige Wikipedia: Gemüsekohl

    Wikipedia · 2026-05-15

  6. English Wikipedia: Brassica oleracea

    Wikipedia · 2026-05-15

Details

More public plant data

Names
Common

Romanesco broccoli

Plural

Romanesco broccolis

BotanicalBrassica oleracea
Botanical authorL.
Scientific synonyms
  1. Brassica oleracea var. botrytis
  2. Brassica oleracea Botrytis Group
Synonyms
  1. Roman cauliflower
  2. Romanesque cauliflower
  3. Broccolo Romanesco
Common synonyms
  1. Romanesque cauliflower
  2. Roman cauliflower
Regional names
Historical names
Market names
  1. Romanesco
Misspellings
  1. Romanescoe
International names
It
  1. Broccolo romanesco
Fr
  1. Chou romanesco
Es
  1. Minarete
  2. Brócoli romanesco
Search terms
  1. Romanesco
  2. Broccoli
  3. Cauliflower
Taxonomy
KingdomPlantae
Clades
  1. Tracheophyta
  2. Angiospermae
  3. Eudicotyledonae
  4. Rosidae
OrderBrassicales
Family botanicalBrassicaceae
Family

Mustards

Family idbrassicaceae
GenusBrassica
SpeciesBrassica oleracea
Cultivar groupBotrytis Group
Hybrid statusnot_hybrid
Related crops
  1. Broccoli
  2. Cauliflower
  3. Kohlrabi
  4. Brussels sprouts
Classification
Main groupVegetables
Sub groupBrassicas
Crop groupFlower vegetables
Life cyclebiennial
Perennialno
Woodyno
Treeno
Shrubno
Edible parts
  1. Inflorescence
  2. Leaves
Nutrient groupHeavy feeders
Calendar
Sowing indoor
Months
  1. 3
  2. 4
Earliest month3
Latest month4
Notes

Sow in trays at approx. 18°C; move to a cooler spot after germination.

Sowing outdoor
Months
  1. 4
  2. 5
  3. 6
Earliest month4
Latest month6
Notes

Direct sowing only in favorable weather; pre-culture recommended.

Planting out
Months
  1. 5
  2. 6
  3. 7
Earliest month5
Latest month7
Notes

Harden off before transplanting; plant deep up to the cotyledons.

Harvest
Months
  1. 8
  2. 9
  3. 10
  4. 11
Earliest month8
Latest month11
Notes

Harvest when the head is firm and tight.

Month tasks
3
  1. Start sowing indoors or in the greenhouse.

5
  1. Plant young starts outdoors and protect from slugs.

7
  1. Hoe regularly and water intensively during dry spells.

9
  1. Main harvest season; watch for pests like cabbage white butterflies.

Month tasks structured
3
  1. Tasksowing
    Label

    Sowing indoors

    Prioritymedium
    Months
    1. 3
    2. 4
    Estimated effortlow
    Notes

    Bright location is crucial to prevent leggy growth.

5
  1. Taskplanting
    Label

    Transplanting

    Priorityhigh
    Months
    1. 5
    2. 6
    Estimated effortmedium
    Notes

    Strictly observe planting distances.

Structured month tasks
6
  1. Taskmaintenance
    Label

    Fertilizing & Mulching

    Prioritymedium
    Months
    1. 6
    2. 7
    Estimated effortlow
    Notes

    Second application of horn meal or nettle tea.

Cultivation specs
Seed
Seed depth cm min.1
Seed depth cm max.2
Light germinatorno
Dark germinatoryes
Cold germinatorno
Stratification neededno
Pre soaking recommendedno
Germination temperature c min.15
Germination temperature c max.22
Germination days min.6
Germination days max.12
Seed lifespan years min.3
Seed lifespan years max.5
Direct sowing possibleyes
Pre culture recommendedyes
Spacing
Plant spacing cm min.50
Plant spacing cm max.60
Row spacing cm min.50
Row spacing cm max.60
Recommended density per sqm min.3
Recommended density per sqm max.4
Min. bed width60 cm
Square foot gardening spacing1 per square
Spacing notes

Closer spacing results in smaller heads.

Growth dimensions
Height cm min.40
Height cm max.70
Width cm min.40
Width cm max.60
Root depth cm min.30
Root depth cm max.50
Root spread cm min.30
Root spread cm max.40
Growth speedmedium
Final size notes

Spreading growth; requires ample space for leaf development.

Temperature
Min. growing temperature8 °C
Optimal temperature c min.16
Optimal temperature c max.24
Max. heat tolerance30 °C
Soil temperature for sowing c min.12
Soil temperature for sowing c optimal18
Frost sensitiveno
Late frost sensitiveyes
Heat tolerancemedium
Cold tolerancemedium
Temperature notes

Light frost is tolerated but can damage head quality.

Water
Water needhigh
Critical water phases
  1. Establishment phase
  2. Heading stage
Drought tolerantno
Drought sensitivityhigh
Waterlogging sensitiveyes
Mulching recommendedyes
Water notes

Consistent moisture prevents premature bolting.

Nutrition
Nutrient groupheavy_feeder
Heavy feederyes
Medium feederno
Light feederno
Nitrogen needhigh
Phosphorus needmedium
Potassium needhigh
Calcium needhigh
Magnesium needmedium
Compost recommendedyes
Mulching recommendedyes
Fertilizer sensitivitylow
Nutrition notes

Cabbage requires calcareous soil and sufficient Boron/Molybdenum.

Container
Container suitableyes
Min. pot volume20 l
Recommended pot volume30 l
Min. pot depth30 cm
Min. pot diameter40 cm
Plants per container min.1
Plants per container max.1
Drainage requiredyes
Repotting neededno
Container notes

Only successful in very large pots; high water demand.

Support
Needs supportno
Support recommendedno
Climbingno
Viningno
Trellis recommendedno
Training requiredno
Support notes

Hilling up the stems improves stability.

Cultivation modes
Outdoor bed suitableyes
Raised bed suitableyes
Container suitableyes
Balcony suitableno
Greenhouse suitableyes
Polytunnel suitableyes
Indoor suitableno
Windowsill suitableno
Hydroponic possibleno
Permaculture suitableyes
No dig suitableyes
Yield density
Yield per plant min.0.5
Yield per plant max.1.5
Yield unitkg
Yield per sqm min.1.5
Yield per sqm max.4.5
Yield reliabilitymedium
Yield notes

Yield varies significantly based on weather and nutrient supply.

Site
Exposure

Sunny

Wind protection

Required

Microclimate

Cool, moist maritime climate is ideal.

Soil
Soil type

Loamy, deep

PH range6.5 - 7.5
Humus content

Very high

Watering
Frequency

Frequent, never let soil dry out.

Technique

Water directly at the base, keep leaves dry.

Nutrition
Fertilization strategy

Base fertilization with manure in autumn, top dressing in summer.

Cultivation planning
Succession sowing
Possibleyes
Interval days min.14
Interval days max.21
Bed planning notes

Good neighbors: Tomatoes, Celery; bad neighbors: other brassicas.

Rotation priorityhigh
Interplanting potentialmedium
Mechanization relevancelow
Crop rotation
Rotation period years4
Successors
  1. Lettuce
  2. Spinach
  3. Peas
Predecessors
  1. Beans
  2. Peas
  3. Broad beans
Deficiencies
Boron
Name

Boron deficiency

Symptoms

Hollow stems, brown spots in the head.

Problems
Bolting
Name

Bolting

Cause

Drought stress or excessively high temperatures.

Problem management
Common pest groups
  1. Biting insects
  2. Sucking insects
Common disease groups
  1. Soil-borne fungi
  2. Leaf spot diseases
Prevention principles
  1. Maintain a wide crop rotation (4-5 years).
  2. Use insect meshes.
  3. Ensure consistent water supply.
Diagnosis notes

In case of wilting despite moist soil, always check the roots for clubroot.

Disease graph
ScopeRomanesco specific pathologies
Profiles
  1. Slugclubroot
    Severityhigh
    Conditions
    1. Acidic soils
    2. Waterlogging
    Affected parts
    1. Roots
    Prevention
    1. Liming to raise pH level
    2. Observe crop rotation
    Organic control
    1. Dispose of infected plants in residual waste (not compost).
Diagnostic rules
  1. Symptom

    Plant wilts in sun, recovers at night.

    Possible causes
    1. clubroot
    2. water_stress
    First checks
    1. Check soil moisture
    2. Examine root neck for swellings
Prevention strategy
Cultural
  1. Hilling up for stability
  2. Mulching for moisture
Monitoring
  1. Weekly check of leaf undersides for eggs.
Organic first response
  1. Manual removal of caterpillars
  2. Use of Bacillus thuringiensis
Notes

Nets should be applied immediately after planting.

Diagnosis
Phenology
Stages
  1. Germination
  2. Leaf development
  3. Leaf rosette formation
  4. Inflorescence development (heading)
  5. Head maturity
  6. Bolting/Flowering (in 2nd year)
  7. Seed ripening
Notes

Romanesco is a biennial plant that forms the edible inflorescence in the first year and only flowers after a cold period in the second year.

Flowering pollination
Flowering period

May to July (in the second year)

Flower color

Yellow

Harvest
Main season

August to November

Optimal time

In the morning, after the dew has dried.

Harvest details
Harvest frequency

Single harvest per plant.

Harvest indicators
  1. Head has reached desired size
  2. Individual florets are still tightly closed
  3. Fractal structure is clearly defined
  4. No signs of loosening or flowering
Post harvest handling

Cut the stem with a sharp knife; leave a few wrapper leaves for protection.

Storage
Fresh storage

In the refrigerator (crisper drawer) wrapped in a damp cloth.

Freezing

Divided into florets and briefly blanched, very suitable for freezing.

Storage details
General storage category

Short-term storage / Freezing

Storage life

Fresh: 3-5 days; Frozen: 8-12 months

Processing options
  1. Freezing (blanched)
  2. Pickling (sweet and sour)
  3. Fermenting
Processing use
Industrial relevance

Low; mainly fresh market and frozen foods.

Kitchen usage
Culinary characteristics

Nuttier and more delicate than cauliflower; decorative due to fractal shape.

Preparation methods
  1. Steaming
  2. Oven roasting
  3. Raw in salads
  4. Pan-frying
Safety and edibility
Edible parts
  1. Inflorescence (head)
  2. Tender inner leaves
  3. Stem (peeled)
Inedible or caution parts
  1. Roots
  2. Old, tough outer leaves
Toxicity notes

Non-toxic. May cause bloating in sensitive individuals.

Raw consumption

Very possible; more digestible than many other cabbage types.

Seed saving
Isolation distance1000 m
Minimum plants for diversity20
Method

Plants must overwinter; seed harvest in the summer of the second year.

Seed saving advanced
Crossing risk

High; crosses with all Brassica oleracea species (cauliflower, broccoli, kale, etc.).

Vernalization requirement

Requires a cold period below 10°C for flower induction.

Woody crop details
Rootstock relevancenot_applicable
Renewal pruning relevancenot_applicable
Notes

Romanesco is an herbaceous plant and does not require woody pruning or grafting details.

Ecology
Pollinator valuemedium
Wildlife valuelow
Biodiversity notes

As a biennial plant, Romanesco offers yellow flowers in its second year, which are visited by bees and other insects. In the first year, its ecological value for pollinators is low, as the edible inflorescence is harvested before it flowers.