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pattypan squashCucurbita pepo var. clypeata

The Pattypan squash, often called 'UFO squash', is a fascinating summer squash with a characteristic scalloped shape. It grows in a compact, bushy habit, making it ideal for smaller gardens or large containers. The fruits should be harvested young when the flesh is most tender and the skin is still soft. In the kitchen, it impresses with its versatility – whether stuffed, grilled, or pickled.

pattypan squash (Cucurbita pepo var. clypeata): plant portrait for plant portrait - Vegetables, Gourd family, Harvest July
pattypan squash: plant portrait. harvest: July - October.

Quick profile

Key data

Planting

May - June

Harvest

July - October

Water

high

Good neighbors

CornPole beanNasturtium

Avoid

Cucumber

Growing data

pattypan squash Growing data

Seed depth

2 - 3 cm

Plant spacing

80 - 100 cm

Row spacing

100 - 120 cm

Germination temp

18 - 25 °C

Sowing and germination

Seed depth2 - 3 cm
Germination temp18 - 25 °C
Germination time7 - 14 days
Seed viability4 - 6 years
Light germinatorNo
Dark germinatorYes
Cold germinatorNo
Stratification neededNo
Pre-soaking recommendedYes
Direct sowing possibleYes
Pre-culture recommendedYes

Planting and spacing

Plant spacing80 - 100 cm
Row spacing100 - 120 cm
Plants per m²1 - 1.2 per m²
Bed widthfrom 100 cm
Spacing1 per 4 squares

Temperature and site

Soil temperature15 - 20 °C
Growing temperaturefrom 12 °C
Optimal temperature20 - 28 °C
Frost sensitiveYes
Late frost sensitiveYes
Heat tolerancehigh
Cold tolerancevery_low

Water, nutrients and care

Waterhigh
Critical water phasesFlowering, Fruit set
Watering methodbase-only
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 40 l; Diameter: from 40 cm; Depth: from 30 cm
SupportNo
Height40 - 60 cm
Width80 - 120 cm
Root depth30 - 50 cm
Root spread40 - 60 cm
Yield2 - 5 kg

Year plan

pattypan squash Calendar

All plants
Indoor sowingDirect sowingPlantingHarvest

Indoor sowing

April - May

Indoor pre-culture in pots shortens time to harvest and protects against slugs.

Direct sowing

May - June

Direct sowing only after the last frost once soil has warmed up.

Planting

May - June

Transplant after the last frost; handle the root ball with care.

Harvest

July - October

Harvest fruits young (5-10 cm diameter) for the best flavor.

Year plan
  1. Indoor pre-culture
  2. Planting out

Growing

pattypan squash Site, soil and care

Spacing

80 - 100 cm

Storage

Storage temperature c: 10, Humidity requirement: medium, Storage duration days: 7

  • Regular harvesting is key: the more you harvest, the more flowers and fruits the plant will produce.
  • Always water at the base of the plant to keep leaves dry and minimize fungal diseases.

Pruning

pattypan squash Pruning

bush_management

Goal

bush_management

Pruning timing

Summer

July - September

Yield optimization and plant health Regular cleaning prevents diseases and extends the harvesting period.

Remove

  • Dead or heavily mildew-infested leaves
  • Overripe, hardened fruits (to encourage new fruit set)
  • Competing side shoots if space is limited

Preserve

  • Main stem in bush-type varieties
  • Healthy, large foliage leaves for photosynthesis
  • Young fruit sets

Avoid

  • Radical pruning of healthy plants
  • Damaging the main stem during harvest
  • Defoliating the plant during midday sun

Tools and hygiene

Use sharp knives; disinfect after contact with mildew-infected plant parts.

Companion guide

pattypan squash Companion guide

Companion guide

Good neighbors

CornPole beanNasturtium

Avoid

Cucumber

Health

Pests, Diseases

Pests

Slugs

Holes in young plants and small fruits.

Aphids

Curled leaves, honeydew.

Diseases

Powdery mildew

White, powdery coating on the upper leaf surface.

Downy mildew

Yellow spots on the upper leaf surface, grey fungal growth underneath.

Deficiencies

Nitrogen deficiency

Yellowing of older leaves, stunted growth.

Plant health

FAQ

Do you need to peel pattypan squash?

No, for young fruits (up to approx. 10 cm), the skin is very tender and edible. The skin only becomes hard in very large, fully ripe fruits.

Why are the small fruits falling off?

This is usually due to lack of pollination or extreme stress (drought, cold). Attract more insects or try hand pollination.

Related plants

Cucumber

Same family

Both are Cucurbitaceae.

Zucchini

Same crop group

Both are harvested as summer squash in their immature state.

Powdery mildew

Shared diseases

Typical disease for almost all cucurbits.

Tomato

Similar nutrient needs

Both are heavy feeders with high nitrogen and potassium requirements.

Pumpkin

Similar water needs

High water requirement due to large leaf surface area.

Sources

Public sources

  1. Wikidata entity

    Wikidata · 2026-05-14

  2. GBIF species match

    GBIF · 2026-05-14

  3. Deutschsprachige Wikipedia: Patisson

    Wikipedia · 2026-05-14

  4. English Wikipedia: Pattypan squash

    Wikipedia · 2026-05-14

Details

More public plant data

Names
Common

pattypan squash

Plural

pattypan squashes

BotanicalCucurbita pepo var. clypeata
Botanical authorAlef.
Scientific synonyms
  1. Cucurbita pepo var. clypeiformis
  2. Cucurbita pepo Patisson Group
Synonyms
  1. scallop squash
  2. sunburst squash
  3. button squash
  4. custard marrow
Common synonyms
  1. white bush scallop
Regional names
Historical names
Market names
Misspellings
  1. patty pan squash
International names
Fr
  1. pâtisson
  2. bonnet de prêtre
Es
  1. calabaza bonetera
It
  1. zucca patissone
Pl
  1. patison
Ambiguous names
  1. NameBischofsmütze
    Languagede
    Shared with
    1. Cucurbita maxima 'Turbaniformis'
    Clarification

    The name is regionally used for both pattypan and turban squash.

Search terms
  1. pattypan squash
  2. summer squash
  3. scallop squash
Taxonomy
KingdomPlantae
Clades
  1. Tracheophyta
  2. Angiospermae
  3. Eudicotyledoneae
  4. Rosidae
  5. Fabidae
OrderCucurbitales
Family botanicalCucurbitaceae
Family

Gourd family

Family idcucurbitaceae
SubfamilyCucurbitoideae
TribeCucurbiteae
GenusCucurbita
SpeciesCucurbita pepo
SubspeciesCucurbita pepo subsp. pepo
Botanical varietyCucurbita pepo var. clypeata
Cultivar groupPatisson Group
Hybrid statusnot_hybrid
Related crops
  1. Zucchini
  2. Ölkürbis
  3. Spaghettikürbis
Classification
Main groupvegetable
Sub groupfruit_vegetable
Crop groupsquash_pumpkin
Life cycleAnnual
Perennialno
Woodyno
Treeno
Shrubno
Edible parts
  1. fruit
  2. flowers
Nutrient groupheavy_feeder
Calendar
Sowing indoor
Months
  1. 4
  2. 5
Earliest month4
Latest month5
Notes

Indoor pre-culture in pots shortens time to harvest and protects against slugs.

Sowing outdoor
Months
  1. 5
  2. 6
Earliest month5
Latest month6
Notes

Direct sowing only after the last frost once soil has warmed up.

Planting out
Months
  1. 5
  2. 6
Earliest month5
Latest month6
Notes

Transplant after the last frost; handle the root ball with care.

Harvest
Months
  1. 7
  2. 8
  3. 9
  4. 10
Earliest month7
Latest month10
Notes

Harvest fruits young (5-10 cm diameter) for the best flavor.

Month tasks
4
  1. Start sowing in pots indoors or in a greenhouse.

5
  1. Move young plants outdoors after night frosts have passed.

6
  1. Mulch plants and water regularly during dry spells.

7
  1. First harvest of young pattypan squashes.

8
  1. Harvest regularly to encourage further fruit production.

9
  1. Continue to water and harvest regularly.

10
  1. Bring in the last fruits before the first frost.

Month tasks structured
4
  1. Tasksowing
    Label

    Indoor pre-culture

    Prioritymedium
    Months
    1. 4
    Conditionindoor
    Estimated effortlow
    Notes

    Sow one seed per pot (approx. 8-10 cm) deep.

5
  1. Taskplanting
    Label

    Planting out

    Priorityhigh
    Months
    1. 5
    Conditionfrost_free
    Estimated effortmedium
    Notes

    Hardening off plants before transplanting is recommended.

Book content
Overview

The Pattypan squash, often called 'UFO squash', is a fascinating summer squash with a characteristic scalloped shape. It grows in a compact, bushy habit, making it ideal for smaller gardens or large containers. The fruits should be harvested young when the flesh is most tender and the skin is still soft. In the kitchen, it impresses with its versatility – whether stuffed, grilled, or pickled.

Structured month tasks
4
  1. Tasksowing
    Label

    Seed starting

    Prioritymedium
    Months
    1. 4
    Conditionmin_temp_15c
    Estimated effortlow
    Notes

    Sow in nutrient-rich seed starting mix.

5
  1. Taskplanting
    Label

    Planting out

    Priorityhigh
    Months
    1. 5
    Conditionafter_frost
    Estimated effortmedium
    Notes

    Maintain spacing as they grow in a bushy habit.

7
  1. Taskharvesting
    Label

    Main harvest

    Priorityhigh
    Months
    1. 7
    2. 8
    3. 9
    Conditionfruit_size_reached
    Estimated effortlow
    Notes

    Young fruits have the most tender skin.

Cultivation specs
Seed
Seed depth cm min.2
Seed depth cm max.3
Light germinatorno
Dark germinatoryes
Cold germinatorno
Stratification neededno
Pre soaking recommendedyes
Germination temperature c min.18
Germination temperature c max.25
Germination days min.7
Germination days max.14
Seed lifespan years min.4
Seed lifespan years max.6
Direct sowing possibleyes
Pre culture recommendedyes
Spacing
Plant spacing cm min.80
Plant spacing cm max.100
Row spacing cm min.100
Row spacing cm max.120
Recommended density per sqm min.1
Recommended density per sqm max.1.2
Min. bed width100 cm
Square foot gardening spacing1 per 4 squares
Spacing notes

Pattypans usually grow in a compact bushy habit but still need room for foliage.

Growth dimensions
Height cm min.40
Height cm max.60
Width cm min.80
Width cm max.120
Root depth cm min.30
Root depth cm max.50
Root spread cm min.40
Root spread cm max.60
Growth speedfast
Final size notes

The plant stays lower than many vining squashes.

Temperature
Min. growing temperature12 °C
Optimal temperature c min.20
Optimal temperature c max.28
Max. heat tolerance35 °C
Soil temperature for sowing c min.15
Soil temperature for sowing c optimal20
Frost sensitiveyes
Late frost sensitiveyes
Heat tolerancehigh
Cold tolerancevery_low
Temperature notes

Growth stops at temperatures below 10°C.

Water
Water needhigh
Critical water phases
  1. Flowering
  2. Fruit set
Drought tolerantno
Drought sensitivityhigh
Waterlogging sensitiveyes
Mulching recommendedyes
Water notes

Keep leaves dry to prevent powdery mildew.

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

Generous compost application before planting; regular supplemental feeding beneficial.

Container
Container suitableyes
Min. pot volume20 l
Recommended pot volume40 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

Ensure adequate water and nutrient supply in containers.

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

Usually grows as a bush form without tendrils.

Cultivation modes
Outdoor bed suitableyes
Raised bed suitableyes
Container suitableyes
Balcony suitableyes
Greenhouse suitableyes
Polytunnel suitableyes
Indoor suitableno
Windowsill suitableno
Hydroponic possibleno
Permaculture suitableyes
No dig suitableyes
Yield density
Yield per plant min.2
Yield per plant max.5
Yield unitkg
Yield per sqm min.2
Yield per sqm max.6
Yield reliabilityhigh
Yield notes

Regular harvesting increases the total yield per plant.

Site
Exposure

Full sun and sheltered from wind

Microclimate preferences
  1. Warmth-favored
  2. Protection from late frosts
Soil
Soil type

Humus-rich, deep, and loose

PH min.6
PH max.7.5
Soil preparation

Incorporation of mature compost or manure in spring.

Watering
Frequency

Regularly, daily during heatwaves

Notes

Avoid waterlogging but never let the soil dry out completely.

Nutrition
Fertilizing strategy

Base fertilization with compost, liquid feeding every 2 weeks during fruiting.

Cultivation planning
Succession sowing
Possibleyes
Interval days min.21
Interval days max.30
Bed planning notes

Good neighbors include corn, pole beans, and nasturtium. Poor neighbors are other cucurbits (risk of cross-pollination for seed saving).

Rotation priorityhigh
Interplanting potentialmedium
Mechanization relevancelow
Crop rotation
Rotation pause years4
Previous crops
Good
  1. Fabaceae
  2. Allium
  3. Solanum_lycopersicum
Bad
  1. Cucurbitaceae
Following crops
Good
  1. Brassicaceae
  2. Chenopodiaceae
Bad
  1. Cucurbitaceae
Notes

Due to the risk of soil-borne diseases and high nutrient depletion, a 4-year rotation break should be maintained for all cucurbits.

Deficiencies
  1. Slugnitrogen-deficiency
    Name

    Nitrogen deficiency

    Symptoms

    Yellowing of older leaves, stunted growth.

Problems
  1. Slugbitter-fruit
    Name

    Bitter fruits (Cucurbitacins)

    Description

    Fruits taste extremely bitter and are toxic.

    Cause

    Stress or back-crossing with ornamental gourds.

Problem management
Common pest groups
  1. Slugs
  2. Sucking insects
Common disease groups
  1. Powdery mildew
  2. Viruses
Prevention principles
  1. Keep leaves dry during watering.
  2. Ensure sufficient spacing for air circulation.
  3. Use healthy, certified seeds.
Diagnosis notes

Common confusion: Natural silvery leaf patterns on some varieties are often mistaken for mildew.

Disease graph
Scopecentral_europe
Profiles
  1. Slugpowdery-mildew
    Severityhigh
    Conditions
    1. Dry and warm weather
    2. Fair-weather fungus
    Affected parts
    1. Leaves
    2. Stems
    Prevention
    1. Choose resistant varieties
    2. Airy location
    Organic control
    1. Spray a mixture of milk and water (1:8)
Diagnostic rules
  1. Symptom

    Leaves become whitish-powdery

    Possible causes
    1. powdery-mildew
    First checks
    1. Can the coating be wiped off?
    2. Is it on the upper side of the leaf?
Prevention strategy
Cultural
  1. Observe crop rotation
  2. Mulching
Monitoring
  1. Weekly inspection of leaf undersides
Organic first response
  1. Dispose of infested leaves in household waste
Notes

Healthy plants are less susceptible.

Diagnosis
General advice

Distinguish between physiological disorders (e.g., wilting due to lack of water) and infectious diseases.

Phenology
Stages
  1. Germination
  2. Leaf development (rosette stage)
  3. Stem elongation/bush formation
  4. Flower formation (male and female flowers)
  5. Fruit set
  6. Fruit ripening (harvest stage)
  7. Full maturity (seed maturity)
  8. Senescence
Notes

Pattypans develop very quickly as annual, bushy-growing plants, forming the first flowers within a few weeks after planting.

Flowering pollination
Flower type

Monoecious (separate male and female flowers on the same plant)

Flowering period

June to September

Flower description

Large, yellow funnel-shaped flowers; female flowers recognizable by the ovary at the base.

Harvest
Harvest period

July to October

Main harvest months
  1. 7
  2. 8
  3. 9
Yield estimate

Approx. 5-10 fruits per plant with regular harvesting.

Harvest details
Harvest frequency

Check every 2-3 days.

Harvest indicators
  1. Fruits reach 5-10 cm in diameter
  2. Skin is still tender and can be pierced with a fingernail
  3. Glossy surface
Post harvest handling

Cut with a sharp knife leaving a short stem. Do not wash if they are intended for storage.

Storage
Storage temperature10 °C
Humidity requirementmedium
Storage duration7 days
Storage details
General storage category

Short-term storage (summer squash)

Storage life

Lasts about 1 week in the refrigerator or a cool cellar.

Processing options
  1. Pickling in vinegar
  2. Freezing (after blanching)
  3. Fermenting
Processing use
Preservation methods
  1. Pickling
  2. Freezing
Kitchen usage
Culinary profile

Mild, subtly nutty flavor; resembles zucchini but with a firmer texture.

Preparation methods
  1. Stuffing whole and baking
  2. Pan-frying in slices
  3. Grilling
  4. Steaming
Safety and edibility
Edible parts
  1. Flesh
  2. Skin (on young fruits)
  3. Seeds (on mature fruits)
  4. Flowers
Inedible or caution parts
  1. Stem
  2. Roots
  3. Leaves (hairy and rough)
Toxicity notes

Beware of bitter taste: Bitter squashes contain toxic cucurbitacins and must not be eaten. Never grow next to ornamental gourds.

Raw consumption

Young fruits can be eaten raw when grated in salads.

Seed saving
Difficultymedium
Isolation distance meters500
Seed extraction

Allow fruits to ripen fully until the skin becomes hard. Remove seeds, wash, and dry.

Seed saving advanced
Crossing potential

Crosses easily with other Cucurbita pepo varieties (zucchini, styrian oil pumpkin, ornamental gourds).

Purity maintenance

Manual pollination and taping of flowers necessary for true-to-type seeds.

Varieties
  1. NameCustard White
    Color

    White

    Characteristics

    Early, high-yielding variety with pure white fruits.

  2. NameSunburst
    Color

    Yellow with green spot

    Characteristics

    F1 hybrid, very decorative with excellent flavor.

  3. NamePolo
    Color

    Greenish-white

    Characteristics

    Very early variety, tolerant to powdery mildew.

Woody crop details
Notes

Pattypan is an annual herbaceous plant; woody characteristics do not apply.

Ecology
Pollinator valuehigh
Wildlife valuemedium
Biodiversity notes

The large flowers are an excellent source of pollen and nectar for bees and bumblebees. Large leaves provide ground cover and habitat for predatory ground beetles.

Practical notes
  1. Regular harvesting is key: the more you harvest, the more flowers and fruits the plant will produce.

  2. Always water at the base of the plant to keep leaves dry and minimize fungal diseases.

Seasonal content
Spring

Start pre-culture on the windowsill from mid-April.

Summer

Main time for harvesting and regular watering.

Autumn

Remove last fruits before the first frost.

Winter

Time for planning and selecting new varieties.