Plant Profile

red kuri squashCucurbita maxima

Hokkaido squash is a popular and versatile variety of winter squash, distinguished by its bright orange-red color and its nutty, chestnut-like flavor. Its thin skin is edible, simplifying preparation. It is rich in vitamins and minerals and is excellent for soups, purees, curries, and as a side dish.

VegetablesFruit vegetablesCucurbitsGourd family
Calendar
red kuri squash (Cucurbita maxima): plant portrait - Vegetables, Gourd family, Harvest September - November
red kuri squash: plant portrait. harvest: September - November.

Quick profile

Key data

Growing calendar
JanFebMarAprMayJunJulAugSepOctNovDec
Indoor sowing
Direct sowing outdoors
Planting outdoors
Harvest
Indoor sowingDirect sowing outdoorsPlanting outdoorsHarvest

Good neighbors

BeansCornkohlrabiNasturtium

Avoid

potatoCucumber

Indoor & direct sowing

red kuri squash: Sowing and germination

Indoor sowing

Start sowing indoors from early March to get a head start.

Direct sowing outdoors

Direct sowing outdoors only after the last frosts, once the soil has warmed up.

Seed depth2 - 3 cm
Germination temp20 - 28 °C
Germination time7 - 14 days
Light germinatorNo
Dark germinatorYes
Cold germinatorNo
Stratification neededNo
Pre-soaking recommendedNo

Planting & site

red kuri squash: Planting and spacing

Planting outdoors

Transplant seedlings outdoors when the risk of frost has passed and the soil is warm enough.

Plant spacing100 - 150 cm
Row spacing100 - 150 cm
Plants per m²0.5 - 1 per m²
Bed widthfrom 120 cm

Site & practical notes

Hokkaido squash is an easy-to-care-for and high-yielding variety. Ensure sufficient space, regular watering, and nutrient supply. Prevention against slugs and fungal diseases is important. The edible skin saves preparation time.

Temperature & frost

red kuri squash: Temperature and site

Growing temperaturefrom 15 °C
Optimal temperature20 - 28 °C
Max. heatup to 35 °C
Soil temperature15 - 20 °C
Frost sensitiveYes
Late frost sensitiveYes
Heat tolerancemedium
Cold tolerancelow

Water & nutrients

red kuri squash: Water, nutrients and care

Waterhigh
Critical water phasesFlowering, Fruit development
Watering methodat the base
Droughthigh
Waterlogging sensitiveYes
Mulching recommendedYes
Nutrient needheavy_feeder
Compost recommendedYes
Fertilizer sensitivitymedium

Container & growth

red kuri squash: Container, support and growth

Container suitableNo
SupportNo
Height30 - 50 cm
Width200 - 400 cm
Yield1 - 3 fruit

Year plan

red kuri squash Calendar

Plants

From spring sowing to autumn harvest – Hokkaido squash accompanies you throughout the entire gardening season.

Year overview
JanFebMarAprMayJunJulAugSepOctNovDec
Indoor sowing
Direct sowing outdoors
Planting outdoors
Harvest

Relevant now

June

  • Provide initial fertilizationAfter planting: With organic fertilizer if needed.
  • Water regularlyDry weather: Especially important during dry spells.

Next up

July

  • Weed and mulchOngoing: Renew mulch layer to retain moisture and suppress weeds.
  • Monitor for pests and diseasesOngoing: Pay particular attention to slugs and squash vine borers.

Monthly tasks

Single tasks from monthly data; repeated seasonal windows are shown in the overview above.

PlantingHarvestGrowingPlant health

January

Quiet month

February

Quiet month

March

Start indoor cultivation

Growing

  • Start indoor cultivationIndoor sowing: Sow seeds about 2-3 cm deep in seed-starting mix.

April

Cultivate young plants on the windowsill

Planting

  • Cultivate young plants on the windowsillIndoor cultivation: Prick out and transplant into larger pots if necessary.

May

Transplant seedlings outdoorsPrepare site for squash

Planting

  • Transplant seedlings outdoorsAfter last frost, soil warm: Maintain a spacing of approx. 1-1.5 m. Harden off seedlings beforehand.

Growing

  • Prepare site for squashBefore planting: A sunny, sheltered, and nutrient-rich location is ideal.

June

Provide initial fertilizationWater regularly

Growing

  • Provide initial fertilizationAfter planting: With organic fertilizer if needed.
  • Water regularlyDry weather: Especially important during dry spells.

July

Weed and mulchMonitor for pests and diseases

Growing

  • Weed and mulchOngoing: Renew mulch layer to retain moisture and suppress weeds.

Plant health

  • Monitor for pests and diseasesOngoing: Pay particular attention to slugs and squash vine borers.

August

Final fertilization if necessaryPrune vines if necessary

Growing

  • Final fertilization if necessaryLate growth stage: Only if needed to support fruit development.
  • Prune vines if necessaryVigorous growth: Can help focus energy on fruit development.

September

Harvest first squashDry and store squash

Harvest

  • Harvest first squashFruit ripe: Harvest before the first frost. Leave a small piece of stem attached.

Growing

  • Dry and store squashAfter harvest: Store in a cool, dry place.

October

Harvest remaining squashClear and prepare beds

Harvest

  • Harvest remaining squashBefore frost: Ensure all ripe fruits are harvested before the first hard frost.

Growing

  • Clear and prepare bedsEnd of season: Remove plant debris, sow cover crops if desired.

November

No additional single task

December

Quiet month

Flowering & pollination

red kuri squash Flowering & pollination

Self-fertility

cross-pollinating

Pollinator needed

yes

red kuri squash (Cucurbita maxima): 2 for flowering and pollination - Vegetables, Gourd family, Harvest September - November
red kuri squash: flowering and pollination. harvest: September - November.

Overview

Cross-pollination by insects (bees, bumblebees). Male and female flowers are separate but on the same plant.

Notes

Abundant insect pollination is essential for good fruit set. A bee-friendly garden promotes yields.

Companion guide

red kuri squash Companion guide

Companion guide

Good neighbors

BeansCornkohlrabiNasturtium

Avoid

potatoCucumber

Use & storage

red kuri squash Use & storage

Harvest

Harvest before the first frost. The squash can be stored well.

Storage

Winter Squash

Storage life

Several months (3-6 months under optimal conditions).

Harvest

Harvest before the first frost. The squash can be stored well.

Processing

StoringCanningFreezingDrying

After harvest

Harvest squash carefully, leaving a short stem attached. Allow to cure for a few days in a warm, dry place to harden the rind before storage.

Edibility & safety

red kuri squash Edibility & safety

For people

In brief: which parts are edible, which parts remain risky, and whether raw consumption makes sense.

Edible parts:Flesh, Skin, Seeds (roasted)
Caution parts:Flower stem
Raw consumption:Yes, in thin slices or grated. The flesh is relatively tender.

Safety notes

Non-toxic. Be aware of bitter compounds (cucurbitacins) that can occur due to stress or improper storage. Do not consume bitter fruits.

Animal safety

This is not a blanket animal-safe plant: 14 animal types have restrictions, so quantity, access, and plant part still matter.

Animal safety by plant part

Each row shows which parts are more suitable and which parts are critical.

Companion animals

Dog icon for animal safety ratingDog

Flesh, Skin

Flower stem

Risk factors

Bitter taste due to cucurbitacins, Consumption of flower stem

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for dogs in small amounts as a treat. Bitter fruits due to cucurbitacins can cause gastrointestinal upset and should be avoided. Flower stem should not be fed.

Open animal page
Cat icon for animal safety ratingCat

Flesh, Skin

Flower stem

Risk factors

Bitter taste due to cucurbitacins, Consumption of flower stem

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for cats in small amounts as a treat. Avoid the flower stem and bitter-tasting fruits due to possible cucurbitacins. Consumption of large amounts or bitter parts may cause gastrointestinal upset. Consult a veterinarian if symptoms persist.

Open animal page
Rabbit icon for animal safety ratingRabbit

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter taste, Overfeeding

Symptoms

Gastrointestinal upset, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for rabbits in small amounts as a treat. Avoid bitter fruits due to cucurbitacins, which can cause gastrointestinal irritation. Do not feed the flower stem. Consult a veterinarian if symptoms occur.

Open animal page
Guinea pig icon for animal safety ratingGuinea pig

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter taste, Raw seed consumption

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for guinea pigs in small amounts as a treat. Raw seeds may cause gastrointestinal upset due to potential cucurbitacins. Do not feed bitter-tasting fruits.

Open animal page
Hamster icon for animal safety ratingHamster

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter fruits due to stress or improper storage, Excessive consumption of raw seeds

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for hamsters in small amounts as a treat. Raw seed material contains potentially harmful cucurbitacins and should be avoided. Never feed bitter-tasting fruits.

Open animal page
Budgie icon for animal safety ratingBudgie

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter taste, Overfeeding, Raw feeding of seeds

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for budgies in small amounts as a treat. Raw feeding of seeds is not recommended due to potential cucurbitacins and digestive issues. Do not feed if bitter tasting.

Open animal page

Farm animals

Horse icon for animal safety ratingHorse

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter taste, Overfeeding, Consumption of raw seeds

Symptoms

Gastrointestinal upset, Diarrhea

observe

Hokkaido squash is suitable for horses in small amounts as a treat, provided the flesh is not bitter. Raw seeds and flower stems should be avoided due to potential cucurbitacins. If bitter taste is detected, discontinue feeding immediately and consult a veterinarian.

Open animal page
Chicken icon for animal safety ratingChicken

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Raw seed consumption, Bitter fruits due to stress

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for chickens in small amounts as a treat. Raw seeds may cause gastrointestinal upset. Bitter fruits due to cucurbitacins should be avoided.

Open animal page
Duck icon for animal safety ratingDuck

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter taste, Excessive consumption of raw seeds

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

No direct species-specific source was found for ducks. This is a cautious inference from the geese profile and the known plant-part risks.

Open animal page
Goose icon for animal safety ratingGoose

Flesh, Skin

Seeds (raw), Flower stem

Risk factors

Bitter taste, Excessive consumption of raw seeds

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh and skin of red kuri squash are suitable for geese in small amounts as a treat. Raw seeds may cause gastrointestinal upset due to cucurbitacins. Bitter-tasting fruits should not be fed.

Open animal page
Sheep icon for animal safety ratingSheep

Flesh, Skin

Flower stem

Risk factors

Bitter taste, Unripe or stress-induced fruit

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

The flesh, skin, and roasted seeds of red kuri squash are safe for sheep in moderation. Bitter fruits due to cucurbitacins may cause gastrointestinal upset and should be avoided. The flower stem should not be fed.

Open animal page
Goat icon for animal safety ratingGoat

Flesh, Skin

Flower stem

Risk factors

Bitter taste, Unripe or stress-induced fruit

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

No direct species-specific source was found for goats. This is a cautious inference from the sheep profile and the known plant-part risks.

Open animal page
Cattle icon for animal safety ratingCattle

Flesh, Skin

Flower stem

Risk factors

Bitter taste due to cucurbitacins, Overfeeding

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

Hokkaido squash is generally non-toxic for cattle, with the flesh, skin, and roasted seeds suitable as an occasional treat in moderation. The flower stem should be avoided, and bitter fruits must not be fed due to potential cucurbitacins. Overfeeding may cause gastrointestinal upset.

Open animal page
Pig icon for animal safety ratingPig

Flesh, Skin

Flower stem

Risk factors

Bitter taste due to cucurbitacins, Overfeeding

Symptoms

Gastrointestinal upset, Vomiting, Diarrhea

observe

Flesh and skin of red kuri squash are safe for pigs in moderation and can be fed as a treat. Avoid bitter fruits due to cucurbitacins, which can cause gastrointestinal upset. Do not feed flower stem.

Open animal page

This does not replace veterinary advice. If risky plant parts were ingested or symptoms appear, contact a veterinarian.

Max risk

unknown

Highest status

selected parts only

Urgency

observe

Saving seed

red kuri squash Saving seed

Seed viability

3 - 5 years

Practical tips

red kuri squash Practical tips

Common beginner mistakes

Sowing too early outdoors, leading to frost damage.Insufficient planting distance, leading to poor ventilation and increased risk of diseases.Neglecting watering during dry spells.

Success pattern

Early indoor sowing and transplanting after the last frosts.Sufficient space and nutrients for vigorous growth.Regular, but not excessive, watering.

High-impact tips

Mulching the soil around the plants to retain moisture and suppress weeds.Encouraging beneficial insects by planting flowering plants nearby.Harvesting fruits before the first hard frost to prevent losses.

Grower observations

Many gardeners appreciate Hokkaido squash for its hardiness and low maintenance. It grows reliably, even when conditions are not always optimal.The edible skin is a major advantage, as it eliminates the need for peeling and shortens preparation time.

Health

Pests, Diseases

Plant health

SlugsSquash flyAphidsSpider mitesPowdery mildewDowny mildewGray moldNitrogen deficiencyPotassium deficiencyMagnesium deficiencyFruit rotUnripe fruits

Diagnosis help

red kuri squash Diagnosis help

Pest groups

SlugsSquash vine borerAphidsSpider mites

Disease groups

Powdery mildewDowny mildewGray mold

Prevention

Site selection: Sunny, sheltered, good soil.Crop rotation: Not more often than every 3-4 years in the same location.Variety selection: Prefer more resistant varieties.Plant strengthening: Regular application of plant strengtheners.Hygiene: Remove and dispose of infested plant parts immediately.Watering: Consistent, preferably at the base, avoid wetting leaves.Nutrient supply: Sufficient and balanced fertilization.Pest control: Early detection and control, encourage beneficial insects.

Diagnosis

Accurate diagnosis requires observing symptoms, location of infestation, and environmental conditions. Confusion between pests and diseases is possible.

Cultural prevention

Ensure good air circulation by maintaining proper spacing.Avoid overhead watering to keep foliage dry.Practice crop rotation to prevent soil-borne pathogens.Remove and destroy diseased plant material promptly.Select disease-resistant varieties when available.

Monitoring

Regularly inspect plants for early signs of pests and diseases.Pay attention to weather patterns that favor disease development.Check undersides of leaves for pests like aphids or mites.Monitor for wilting or unusual spots on leaves and fruits.

First response

Apply plant strengtheners (e.g., nettle or horsetail decoctions) to boost plant immunity.For powdery mildew, use a mixture of milk and water or baking soda solution.For fungal diseases, remove affected parts immediately and ensure good hygiene.Use biological pest control agents like ladybugs for aphids.

Diagnostic rules

White, powdery coating on leaves

Possible causes: Powdery mildew

  • Check weather conditions (dry-warm)
  • Inspect leaves for texture

Yellowish spots on upper leaf surface, gray coating on underside

Possible causes: Downy mildew

  • Check weather conditions (damp-cool)
  • Inspect leaf undersides

Gray, fuzzy coating on stems or fruits, soft rot

Possible causes: Gray mold

  • Check humidity levels
  • Look for injuries or fruit contact with soil

FAQ

When is the best time to sow Hokkaido squash?

Indoor sowing starts from early March. Direct sowing outdoors is done from mid-May, after the last frosts and when the soil has warmed up.

How much space does a Hokkaido squash plant need?

Hokkaido squash plants are vigorous growers and require ample space. Plan for about 1 to 1.5 square meters per plant.

Can you eat the skin of Hokkaido squash?

Yes, the skin of Hokkaido squash is thin and softens during cooking, making it edible. This saves preparation time.

When and how to harvest Hokkaido squash?

Harvest takes place in autumn, before the first frost (September to November). Cut the fruits with a short stem attached. Store them in a cool, dry place.

What to do about pests on Hokkaido squash?

Common pests include slugs, squash vine borers, and aphids. Prevention through good crop rotation, encouraging beneficial insects, and possibly protective netting. Use biological methods if infestation occurs.

Is red kuri squash safe for Dog?

red kuri squash is classified as selected parts only for Dog. Risk: unknown. Urgency: observe. The flesh and skin of red kuri squash are suitable for dogs in small amounts as a treat. Bitter fruits due to cucurbitacins can cause gastrointestinal upset and should be avoided. Flower stem should not be fed.

Is red kuri squash safe for Cat?

red kuri squash is classified as selected parts only for Cat. Risk: unknown. Urgency: observe. The flesh and skin of red kuri squash are suitable for cats in small amounts as a treat. Avoid the flower stem and bitter-tasting fruits due to possible cucurbitacins. Consumption of large amounts or bitter parts may cause gastrointestinal upset. Consult a veterinarian if symptoms persist.

Is red kuri squash safe for Rabbit?

red kuri squash is classified as selected parts only for Rabbit. Risk: unknown. Urgency: observe. The flesh and skin of red kuri squash are suitable for rabbits in small amounts as a treat. Avoid bitter fruits due to cucurbitacins, which can cause gastrointestinal irritation. Do not feed the flower stem. Consult a veterinarian if symptoms occur.

Is red kuri squash safe for Guinea pig?

red kuri squash is classified as selected parts only for Guinea pig. Risk: unknown. Urgency: observe. The flesh and skin of red kuri squash are suitable for guinea pigs in small amounts as a treat. Raw seeds may cause gastrointestinal upset due to potential cucurbitacins. Do not feed bitter-tasting fruits.

Guides

Related guides

Garden guides

Sources

Public sources

  1. Wikidata entity

    Wikidata · 2026-05-13

  2. GBIF species match

    GBIF · 2026-05-13

  3. Deutschsprachige Wikipedia: Hokkaidokürbis

    Wikipedia · 2026-05-13

  4. English Wikipedia: Red kuri squash

    Wikipedia · 2026-05-13

  5. Trefle API: Cucurbita maxima

    Trefle · 2026-05-13

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