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Pacific Giant Pumpkin

Pacific Giant · Cucurbitaceae

Giant pumpkin variety bred for very large fruits that can exceed several hundred pounds under good culture. Needs long heat, deep fertile soil, and extreme vine room. Key facts: 115–125 days to maturity, 8+ hours of sun, 96–120 " spacing. Not recommended for containers.

Updated April 19, 2026 · Backed by 4 cited sources
Overview

At a Glance

The essentials first: timing, light, spacing, seed-starting, container fit, and overall size.

Days to maturity
115–125 days
Sun
8+ hours
Full Sun, 8 10+ Hours
Spacing
96–120 "
between plants
Seed start
2–4 weeks
before transplant
Container
Not recommended
Needs 40+ gal if attempted
Height
1–2 ft
at maturity
Planting window

Zone Planting Guide

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This card updates instantly with viability, frost timing, and any planting notes for your selected zone.

Care

Growing Guide

Everything in one place: seed starting, transplant timing, watering, soil, and structural support.

Seed starting
Germination
Time5–10 days
Optimal temperature85°F
Seed depth1"
Moving outdoors
Transplanting
Minimum soil temp65°F
Harden off7 days
Moisture
Watering
Weekly1–2 "
NeedsConsistent
Drip or soaker hose
Root zone
Soil
pH range6–6.8
PreferredFertile, Moisture Retentive, Well Drained Loam
Pumpkin - Pacific Giant seeds

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Pumpkin - Pacific Giant seeds

The Pacific Giant pumpkin has been known to grow easily over 350 pounds!

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When you shop on Amazon using this link, SoilStack earns a small commission at no extra cost to you. It's how we keep the site free and the calendar ad-free. Every product on this page was hand-selected based on university extension research.

A-Frame Vegetable Trellis (50"x50")

Folds flat for storage, fits inside standard raised beds. Works for cucumbers, squash, beans, peas, and small melons.

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Resilience

Plant Health

Stress tolerance, resistance notes, and the most common problems to watch for as plants mature.

Tolerance
Heat: Moderate Cold: Low Drought: Moderate

Common Issues

Poor Fruit Set

Cause: Rainy weather, low bee activity, or excess nitrogen can reduce fruit set.

Prevention: Encourage pollinators, avoid insecticides during bloom, and hand-pollinate if needed.

Squash Vine Borer Or Bug Damage

Cause: Cucurbit pests weaken vines and reduce fruit fill.

Prevention: Scout early, use row cover before bloom where practical, and keep plants vigorous.

Feeding & picking

Nutrition & Harvest

How hungry the plant is, what ripe harvest looks like, and how long the crop keeps after picking.

Feeding
Nutrition
Feeding intensityHeavy feeder
RecipesRoot Drench, Worm Castings Topdress, Compost Tea
Timing
Harvest

Harvest when fruit are fully colored, the rind is hard enough to resist a fingernail, and the stem is corky or drying. Leave a short stem attached.

Expected yield100–350 lbs/plant
Storage75 days — Cure briefly in a warm dry spot, then store in a cool dry room with good airflow.

Recommended fertilizer · paid link ?When you shop on Amazon using this link, SoilStack earns a small commission at no extra cost to you. It's how we keep the site free and the calendar ad-free. Every product on this page was hand-selected based on university extension research.

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Espoma Tomato-Tone (4lb)

The fertilizer extension agents recommend. 3-4-6 NPK with 8% calcium to prevent blossom end rot. From the brand that's been in business since 1929.

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Plant relationships

Companion Planting

Helpful neighbors can support growth or deter pests. Keep antagonistic plants separated to reduce stress and competition.

What you'll need

Growing Supplies

Based on Pacific Giant's growth profile -- recommendations matched to this variety's specific requirements.

Drip irrigation / soaker hose kit

Every gardener benefits from putting water at the root zone instead of on the leaves, because drip and soaker systems reduce foliar disease pressure by limiting leaf wetness and soil splash. A quality kit should include a backflow preventer, filter, pressure reducer, and UV-resistant tubing.

Source: Iowa State University Extension; Colorado State University Extension; UMass Extension

Soil test kit

A soil test gives a baseline for pH and nutrient status so gardeners can add only what the soil actually needs. Prioritize a mail-in or lab-affiliated kit whenever possible because extension guidance notes that laboratory testing is more accurate than instant readers.

Source: University of Maryland Extension; Purdue Extension; Montana State University Extension

Quality bypass pruners

Extension guidance favors bypass designs because they make cleaner, closer cuts on living tissue than anvil types. Look for hardened steel blades that can be sharpened, a comfortable grip, and a cutting capacity matched to real home-garden stems.

Source: University of New Hampshire Extension; Iowa State University Extension; Purdue University Extension

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Research

Sources

Reference material and extension guidance used to build this growing guide.

seed_catalog SeedsNowuniversity University of Maryland Extensionuniversity University of Minnesota Extensioninference Pacific Giant maturity window, yield range, and spacing inferred from giant pumpkin extension guidance plus catalog giant-fruit description.
Internal links

Pacific Giant Pumpkin Planting Dates by Zone

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