Profile
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.

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
Planting and spacing
Temperature and site
Water, nutrients and care
Container, support and growth
Year plan
Romanesco broccoli Calendar
Indoor sowing
Sow in trays at approx. 18°C; move to a cooler spot after germination.
Direct sowing
Direct sowing only in favorable weather; pre-culture recommended.
Planting
Harden off before transplanting; plant deep up to the cotyledons.
Harvest
Harvest when the head is firm and tight.
Year plan
- Sowing indoors
- 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
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
Both are cultivars of Brassica oleracea.
Both are grown for their edible inflorescences.
Cauliflower
Both are cultivars of Brassica oleracea.
Both are grown for their edible inflorescences.
kohlrabi
Both are cultivars of Brassica oleracea.
Clubroot
All brassicas are susceptible to clubroot.
Cabbage
All brassicas are heavy feeders and require many nutrients.
Internal links
Related plants
Sources
Public sources
- Wikidata entity
Wikidata · 2026-05-15
- GBIF species match
GBIF · 2026-05-15
- Wikidata entity
Wikidata · 2026-05-15
- GBIF species match
GBIF · 2026-05-15
- Deutschsprachige Wikipedia: Gemüsekohl
Wikipedia · 2026-05-15
- English Wikipedia: Brassica oleracea
Wikipedia · 2026-05-15
Details
More public plant data
Names
Common
Romanesco broccoli
Plural
Romanesco broccolis
Scientific synonyms
- Brassica oleracea var. botrytis
- Brassica oleracea Botrytis Group
Synonyms
- Roman cauliflower
- Romanesque cauliflower
- Broccolo Romanesco
Common synonyms
- Romanesque cauliflower
- Roman cauliflower
Regional names
Historical names
Market names
- Romanesco
Misspellings
- Romanescoe
International names
It
- Broccolo romanesco
Fr
- Chou romanesco
Es
- Minarete
- Brócoli romanesco
Search terms
- Romanesco
- Broccoli
- Cauliflower
Taxonomy
Clades
- Tracheophyta
- Angiospermae
- Eudicotyledonae
- Rosidae
Family
Mustards
Related crops
- Broccoli
- Cauliflower
- Kohlrabi
- Brussels sprouts
Classification
Edible parts
- Inflorescence
- Leaves
Calendar
Sowing indoor
Months
- 3
- 4
Notes
Sow in trays at approx. 18°C; move to a cooler spot after germination.
Sowing outdoor
Months
- 4
- 5
- 6
Notes
Direct sowing only in favorable weather; pre-culture recommended.
Planting out
Months
- 5
- 6
- 7
Notes
Harden off before transplanting; plant deep up to the cotyledons.
Harvest
Months
- 8
- 9
- 10
- 11
Notes
Harvest when the head is firm and tight.
Month tasks
3
Start sowing indoors or in the greenhouse.
5
Plant young starts outdoors and protect from slugs.
7
Hoe regularly and water intensively during dry spells.
9
Main harvest season; watch for pests like cabbage white butterflies.
Month tasks structured
3
- Tasksowing
Label
Sowing indoors
PrioritymediumMonths
- 3
- 4
Estimated effortlowNotes
Bright location is crucial to prevent leggy growth.
5
- Taskplanting
Label
Transplanting
PriorityhighMonths
- 5
- 6
Estimated effortmediumNotes
Strictly observe planting distances.
Structured month tasks
6
- Taskmaintenance
Label
Fertilizing & Mulching
PrioritymediumMonths
- 6
- 7
Estimated effortlowNotes
Second application of horn meal or nettle tea.
Cultivation specs
Seed
Spacing
Spacing notes
Closer spacing results in smaller heads.
Growth dimensions
Final size notes
Spreading growth; requires ample space for leaf development.
Temperature
Temperature notes
Light frost is tolerated but can damage head quality.
Water
Critical water phases
- Establishment phase
- Heading stage
Water notes
Consistent moisture prevents premature bolting.
Nutrition
Nutrition notes
Cabbage requires calcareous soil and sufficient Boron/Molybdenum.
Container
Container notes
Only successful in very large pots; high water demand.
Support
Support notes
Hilling up the stems improves stability.
Cultivation modes
Yield density
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
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
Bed planning notes
Good neighbors: Tomatoes, Celery; bad neighbors: other brassicas.
Crop rotation
Successors
- Lettuce
- Spinach
- Peas
Predecessors
- Beans
- Peas
- 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
- Biting insects
- Sucking insects
Common disease groups
- Soil-borne fungi
- Leaf spot diseases
Prevention principles
- Maintain a wide crop rotation (4-5 years).
- Use insect meshes.
- Ensure consistent water supply.
Diagnosis notes
In case of wilting despite moist soil, always check the roots for clubroot.
Disease graph
Profiles
- SlugclubrootSeverityhigh
Conditions
- Acidic soils
- Waterlogging
Affected parts
- Roots
Prevention
- Liming to raise pH level
- Observe crop rotation
Organic control
- Dispose of infected plants in residual waste (not compost).
Diagnostic rules
Symptom
Plant wilts in sun, recovers at night.
Possible causes
- clubroot
- water_stress
First checks
- Check soil moisture
- Examine root neck for swellings
Prevention strategy
Cultural
- Hilling up for stability
- Mulching for moisture
Monitoring
- Weekly check of leaf undersides for eggs.
Organic first response
- Manual removal of caterpillars
- Use of Bacillus thuringiensis
Notes
Nets should be applied immediately after planting.
Diagnosis
Phenology
Stages
- Germination
- Leaf development
- Leaf rosette formation
- Inflorescence development (heading)
- Head maturity
- Bolting/Flowering (in 2nd year)
- 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
- Head has reached desired size
- Individual florets are still tightly closed
- Fractal structure is clearly defined
- 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
- Freezing (blanched)
- Pickling (sweet and sour)
- 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
- Steaming
- Oven roasting
- Raw in salads
- Pan-frying
Safety and edibility
Edible parts
- Inflorescence (head)
- Tender inner leaves
- Stem (peeled)
Inedible or caution parts
- Roots
- 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
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
Notes
Romanesco is an herbaceous plant and does not require woody pruning or grafting details.
Ecology
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.



