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Hubbard Squash
Intermediate

Hubbard Squash

Cucurbita maxima

Family: Cucurbitaceae

Hubbard squash is a large, teardrop-shaped winter squash with bumpy skin and exceptional storage ability. Known for its sweet, fine-grained golden flesh, it was once the most popular winter squash in America. Perfect for feeding a crowd.

Days to Harvest

100-120 days

Sun Needs

Full Sun (8+ hours)

Water Needs

moderate

Germination Temp

85°F optimal

Seed Starting

Start Indoors

3 weeks before last frost

Germination

5-10 days

Seed Depth

1 inch

Light to Germinate

No

đź’ˇ Tip: Needs long season. Start early in short-season areas.

Growing Conditions

Soil Type

Rich, well-draining soil

pH Range

6 - 6.8

Spacing

6-8 feet between plants—large vines

Companion Plants
âś“ Cornâś“ Beans

⚠️ Avoid planting near:

âś— Potatoes
History & Nutrition

History

Hubbard squash carries a name steeped in New England legend and botanical mystery. The traditional story credits a Mrs. Elizabeth Hubbard of Marblehead, Massachusetts, who supposedly received seeds from a sea captain and shared them with seed merchant James J.H. Gregory around 1842. Gregory introduced the variety commercially in 1856 and marketed it aggressively, turning the Hubbard into the dominant winter squash of the late 19th and early 20th century. However, the squash's true origin remains uncertain—it may have been a Native American variety, a Caribbean import, or a South American heirloom. Regardless of its origins, the Hubbard's combination of exceptional storage ability (6-7 months in proper conditions), sweet fine-grained golden flesh, and enormous size (10-40 pounds) made it the squash of choice for families needing to feed large households through New England winters. Before refrigeration, Hubbards in root cellars provided nutrition from October through April. The squash's hard, bumpy shell made it nearly indestructible in storage but famously difficult to cut—many gardeners used hacksaws or dropped the squash onto concrete to crack it open. Blue, green, golden, and warted varieties developed, each with slightly different characteristics. Commercial production waned as refrigeration reduced dependence on storage crops and smaller families preferred smaller squash, but Hubbard remains beloved by traditional New England cooks and bakers who prize its superior flavor for pies and soups. The variety's extreme hardiness also made it valuable as rootstock for grafting other squash varieties in commercial production.

Nutritional Benefits

  • âś“Very high in Vitamin A
  • âś“Good source of Vitamin C
  • âś“High in fiber
Climate & Temperature

Optimal Growing Temp

65°F - 85°F

Hubbard thrives in warm temperatures between 65-85°F. Full sun is essential for developing sweet, large fruit. Requires long warm season.

Survival Range

50°F - 95°F

Can survive these temperatures

tender
warm Season

Frost Note: Killed by any frost. Plant only after all frost danger has passed and soil has warmed to at least 60°F. Harvest before hard frost.

Best USDA Zones

Zone 5Zone 6Zone 7Zone 8Zone 9

Humidity

50-70%

Moderate humidity is ideal. Good air circulation is essential for disease prevention on these large, spreading plants.

Plant Size & Growth

Height

18-24 inches

Spread

15-20 feet

Growth Habit

vine

annualRoot Depth: Extensive root system extending 36+ inches. Very vigorous vines spread widely.
Growth Stages

Germination

7-14 days

Seed coat splits, cotyledons emerge and unfold, hypocotyl straightens. Faster in warm soil (85°F optimal).

Seedling Stage

Duration: 2-3 weeks

True leaves: First true leaves are large and rounded with scalloped edges

Transplant ready: Ready to transplant when 2-3 true leaves developed and roots fill cell. Handle carefully.

Vegetative Growth

Duration: 6-8 weeks

Very vigorous vines extend rapidly with large leaves. Extensive root system establishes.

Flowering

Timing: 7-9 weeks after planting

Duration: 4-6 weeks

Requires bee pollination. Male flowers appear first, female flowers have small teardrop fruit at base.

Fruit Development

Begins: 2-3 weeks after successful pollination

Duration: 10-12 weeks to maturity

Fruit develops distinctive teardrop shape with bumpy skin. Grows to impressive 10-40 lbs.

Harvest Maturity

Timing: 100-120 days from seed

  • Rock-hard, bumpy rind
  • Deep blue-gray, green, or gold color
  • Dry, corky stem
  • Cannot dent with fingernail
  • Sounds hollow when tapped
Expected Yield

Per Plant

2-4 squash (10-40 lbs each)

Per Square Foot

2-4 lbs averaged over growing area

Harvest Frequency

Single harvest when all fruit matures in fall

Factors Affecting Yield

  • •Pollination success
  • •Consistent watering
  • •Heavy fertilizing
  • •Long growing season
  • •Limiting fruit count
Watering Guide

Seedling Stage

Keep consistently moist, water daily if needed

Established Plants

2+ inches per week through deep watering

During Fruiting

Heavy water demands during fruit development; reduce as fruit matures

Preferred Method

Drip irrigation or soaker hose at soil level. Avoid overhead watering.

⚠️ Critical Watering Periods

  • • Flowering and fruit set
  • • Fruit development phase

Pro Tips

  • Water at base of plant to avoid wet foliage
  • Hubbard requires more water than smaller squash varieties
  • Mulch heavily to retain moisture
  • Consistent watering crucial for large fruit development
  • Reduce watering 2-3 weeks before harvest to harden rind
Fertilizing Guide
heavy feederRecommended: Balanced 10-10-10 at planting, then higher phosphorus/potassium when fruiting

Feeding Schedule

Pre-planting

Heavy compost and balanced organic fertilizer

Once at soil preparation

Vine development

Balanced fertilizer (10-10-10)

Every 2 weeks

Flowering/Fruiting

Low-nitrogen, high-phosphorus fertilizer

Every 2 weeks

Organic Options

Heavy compost applicationFish emulsionBone mealKelp mealWell-rotted manure

Work 4-6 inches of compost into planting area—Hubbard is a heavy feeder. Side-dress multiple times during season.

Container Growing
âś— Not ideal for containers

Minimum Size

Not recommended

Recommended Size

Not suitable for containers

Depth Required

N/A

Container Tips

  • Hubbard squash is too large and vigorous for container growing
  • Vines spread 15-20 feet and fruits can weigh 40 lbs
  • Would require enormous container and constant watering
  • Choose smaller squash varieties for containers instead
Support & Trellising
Support Optional

Support Type

Not recommended due to fruit weight

Height Needed

N/A

When to Install

N/A

Method

Hubbard is not typically trellised due to enormous fruit weight (10-40 lbs). Better to let vines sprawl on ground.

Tips

  • Ground growing is strongly recommended
  • Industrial-strength support would be needed if attempted
  • Lay cardboard or straw under developing fruit
  • Rotate fruit occasionally for even coloring
✂️
Pruning Guide
Pruning Optional

Why Prune

Larger individual fruitsEarlier maturityBetter air circulationImproved storage quality

When

After fruit set, when 1-2 squash are developing

How Often

Once or twice during growing season

Technique

Limit to 1-2 fruits per vine for maximum size. Remove excess fruit when baseball-sized.

Remove

  • âś— Excess developing fruit beyond 1-2 per vine
  • âś— Secondary vines if space limited
  • âś— Vine tips after adequate fruit set
  • âś— Damaged or diseased leaves

Keep

  • âś“ Main vine and primary branches
  • âś“ Selected fruits (1-2 per vine)
  • âś“ Plenty of foliage for photosynthesis
Frequently Asked Questions

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