Profile
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.

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
Planting and spacing
Temperature and site
Water, nutrients and care
Container, support and growth
Year plan
pattypan squash Calendar
Indoor sowing
Indoor pre-culture in pots shortens time to harvest and protects against slugs.
Direct sowing
Direct sowing only after the last frost once soil has warmed up.
Planting
Transplant after the last frost; handle the root ball with care.
Harvest
Harvest fruits young (5-10 cm diameter) for the best flavor.
Year plan
- Indoor pre-culture
- 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
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
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
Both are Cucurbitaceae.
Zucchini
Both are harvested as summer squash in their immature state.
Powdery mildew
Typical disease for almost all cucurbits.
Tomato
Both are heavy feeders with high nitrogen and potassium requirements.
Pumpkin
High water requirement due to large leaf surface area.
Internal links
Related plants
Sources
Public sources
- Wikidata entity
Wikidata · 2026-05-14
- GBIF species match
GBIF · 2026-05-14
- Deutschsprachige Wikipedia: Patisson
Wikipedia · 2026-05-14
- English Wikipedia: Pattypan squash
Wikipedia · 2026-05-14
Details
More public plant data
Names
Common
pattypan squash
Plural
pattypan squashes
Scientific synonyms
- Cucurbita pepo var. clypeiformis
- Cucurbita pepo Patisson Group
Synonyms
- scallop squash
- sunburst squash
- button squash
- custard marrow
Common synonyms
- white bush scallop
Regional names
Historical names
Market names
Misspellings
- patty pan squash
International names
Fr
- pâtisson
- bonnet de prêtre
Es
- calabaza bonetera
It
- zucca patissone
Pl
- patison
Ambiguous names
- NameBischofsmützeLanguagede
Shared with
- Cucurbita maxima 'Turbaniformis'
Clarification
The name is regionally used for both pattypan and turban squash.
Search terms
- pattypan squash
- summer squash
- scallop squash
Taxonomy
Clades
- Tracheophyta
- Angiospermae
- Eudicotyledoneae
- Rosidae
- Fabidae
Family
Gourd family
Related crops
- Zucchini
- Ölkürbis
- Spaghettikürbis
Classification
Edible parts
- fruit
- flowers
Calendar
Sowing indoor
Months
- 4
- 5
Notes
Indoor pre-culture in pots shortens time to harvest and protects against slugs.
Sowing outdoor
Months
- 5
- 6
Notes
Direct sowing only after the last frost once soil has warmed up.
Planting out
Months
- 5
- 6
Notes
Transplant after the last frost; handle the root ball with care.
Harvest
Months
- 7
- 8
- 9
- 10
Notes
Harvest fruits young (5-10 cm diameter) for the best flavor.
Month tasks
4
Start sowing in pots indoors or in a greenhouse.
5
Move young plants outdoors after night frosts have passed.
6
Mulch plants and water regularly during dry spells.
7
First harvest of young pattypan squashes.
8
Harvest regularly to encourage further fruit production.
9
Continue to water and harvest regularly.
10
Bring in the last fruits before the first frost.
Month tasks structured
4
- Tasksowing
Label
Indoor pre-culture
PrioritymediumMonths
- 4
ConditionindoorEstimated effortlowNotes
Sow one seed per pot (approx. 8-10 cm) deep.
5
- Taskplanting
Label
Planting out
PriorityhighMonths
- 5
Conditionfrost_freeEstimated effortmediumNotes
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
- Tasksowing
Label
Seed starting
PrioritymediumMonths
- 4
Conditionmin_temp_15cEstimated effortlowNotes
Sow in nutrient-rich seed starting mix.
5
- Taskplanting
Label
Planting out
PriorityhighMonths
- 5
Conditionafter_frostEstimated effortmediumNotes
Maintain spacing as they grow in a bushy habit.
7
- Taskharvesting
Label
Main harvest
PriorityhighMonths
- 7
- 8
- 9
Conditionfruit_size_reachedEstimated effortlowNotes
Young fruits have the most tender skin.
Cultivation specs
Seed
Spacing
Spacing notes
Pattypans usually grow in a compact bushy habit but still need room for foliage.
Growth dimensions
Final size notes
The plant stays lower than many vining squashes.
Temperature
Temperature notes
Growth stops at temperatures below 10°C.
Water
Critical water phases
- Flowering
- Fruit set
Water notes
Keep leaves dry to prevent powdery mildew.
Nutrition
Nutrition notes
Generous compost application before planting; regular supplemental feeding beneficial.
Container
Container notes
Ensure adequate water and nutrient supply in containers.
Support
Support notes
Usually grows as a bush form without tendrils.
Cultivation modes
Yield density
Yield notes
Regular harvesting increases the total yield per plant.
Site
Exposure
Full sun and sheltered from wind
Microclimate preferences
- Warmth-favored
- Protection from late frosts
Soil
Soil type
Humus-rich, deep, and loose
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
Bed planning notes
Good neighbors include corn, pole beans, and nasturtium. Poor neighbors are other cucurbits (risk of cross-pollination for seed saving).
Crop rotation
Previous crops
Good
- Fabaceae
- Allium
- Solanum_lycopersicum
Bad
- Cucurbitaceae
Following crops
Good
- Brassicaceae
- Chenopodiaceae
Bad
- 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
- Slugnitrogen-deficiency
Name
Nitrogen deficiency
Symptoms
Yellowing of older leaves, stunted growth.
Problems
- 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
- Slugs
- Sucking insects
Common disease groups
- Powdery mildew
- Viruses
Prevention principles
- Keep leaves dry during watering.
- Ensure sufficient spacing for air circulation.
- Use healthy, certified seeds.
Diagnosis notes
Common confusion: Natural silvery leaf patterns on some varieties are often mistaken for mildew.
Disease graph
Profiles
- Slugpowdery-mildewSeverityhigh
Conditions
- Dry and warm weather
- Fair-weather fungus
Affected parts
- Leaves
- Stems
Prevention
- Choose resistant varieties
- Airy location
Organic control
- Spray a mixture of milk and water (1:8)
Diagnostic rules
Symptom
Leaves become whitish-powdery
Possible causes
- powdery-mildew
First checks
- Can the coating be wiped off?
- Is it on the upper side of the leaf?
Prevention strategy
Cultural
- Observe crop rotation
- Mulching
Monitoring
- Weekly inspection of leaf undersides
Organic first response
- 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
- Germination
- Leaf development (rosette stage)
- Stem elongation/bush formation
- Flower formation (male and female flowers)
- Fruit set
- Fruit ripening (harvest stage)
- Full maturity (seed maturity)
- 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
- 7
- 8
- 9
Yield estimate
Approx. 5-10 fruits per plant with regular harvesting.
Harvest details
Harvest frequency
Check every 2-3 days.
Harvest indicators
- Fruits reach 5-10 cm in diameter
- Skin is still tender and can be pierced with a fingernail
- 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 details
General storage category
Short-term storage (summer squash)
Storage life
Lasts about 1 week in the refrigerator or a cool cellar.
Processing options
- Pickling in vinegar
- Freezing (after blanching)
- Fermenting
Processing use
Preservation methods
- Pickling
- Freezing
Kitchen usage
Culinary profile
Mild, subtly nutty flavor; resembles zucchini but with a firmer texture.
Preparation methods
- Stuffing whole and baking
- Pan-frying in slices
- Grilling
- Steaming
Safety and edibility
Edible parts
- Flesh
- Skin (on young fruits)
- Seeds (on mature fruits)
- Flowers
Inedible or caution parts
- Stem
- Roots
- 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
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
- NameCustard White
Color
White
Characteristics
Early, high-yielding variety with pure white fruits.
- NameSunburst
Color
Yellow with green spot
Characteristics
F1 hybrid, very decorative with excellent flavor.
- 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
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
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.
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.



