Burgess Buttercup Squash Growing Tool

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Harvest

Start Indoors

Transplant

Direct Sow

Harvest

Showing dates for Burgess Buttercup Squash in USDA Zone 7

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Zone Map

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Burgess Buttercup Squash · Zones 3–10

What grows well in Zone 7? →

Growing Details

Difficulty

Moderate

Spacing6-8 feet

SoilRich, well-drained soil with high organic matter

pH6.0-6.8

Water1-2 inches per week, reduce before harvest

SeasonWarm season

FlavorExtremely sweet, creamy, and rich with nutty undertones

ColorGray-green skin with dark green stripes, bright orange flesh

Size3-5 pounds, 6-8 inches across

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	April – May	May – June	May – June	August – September
Zone 4	April – May	May – June	May – June	August – September
Zone 5	April – May	May – June	May – June	August – October
Zone 6	March – April	April – June	May – June	August – October
Zone 7	March – April	April – June	April – June	July – October
Zone 8	February – April	March – June	April – July	July – October
Zone 9	January – March	February – May	March – July	June – October
Zone 10	January – February	February – April	February – June	May – September

Complete Growing Guide

Start your Burgess Buttercup journey by selecting a sunny location with at least 100 square feet of space per plant—these vigorous vines can spread 10-12 feet in all directions. Prepare your soil in fall or early spring by working in 4-6 inches of well-aged compost or rotted manure, as this variety demands rich, fertile conditions to develop its signature sweetness.

For direct sowing, wait until soil temperatures consistently reach 65°F and all danger of frost has passed. Plant seeds 1 inch deep in hills spaced 8-10 feet apart, sowing 4-5 seeds per hill and thinning to the strongest 2-3 seedlings once they develop their first true leaves. If you're in zones 6 and cooler, start seeds indoors 3-4 weeks before your last frost date using biodegradable pots to minimize transplant shock—Burgess Buttercup is particularly sensitive to root disturbance.

When transplanting indoor starts, harden off plants for a full week and transplant on a cloudy day to reduce stress. Create a small depression around each plant to help retain water, as consistent moisture is crucial during the first 60 days of growth.

Feed your plants with a balanced fertilizer (10-10-10) at planting, then switch to a lower-nitrogen formula (5-10-10) once flowering begins—too much nitrogen late in the season will produce lush foliage at the expense of fruit development. Side-dress with compost monthly throughout the growing season.

The most common mistake is underestimating space requirements. Cramped plants are more susceptible to powdery mildew and produce fewer, smaller fruits. Train vines away from your main garden beds and consider growing them up sturdy trellises or fences if space is limited, though you'll need to support developing fruits with slings made from old pantyhose or cloth strips.

To maximize your harvest, hand-pollinate female flowers (those with small fruits at their base) using a small paintbrush in early morning when flowers are fully open. This is especially important in areas with declining bee populations.

Harvesting

Harvest Burgess Buttercup squash when the skin has fully developed its characteristic gray-green color with distinct darker green stripes, typically 100-110 days from planting. The skin should be hard enough that you can't dent it with your fingernail, and the ground spot (where the fruit rests on soil) should be creamy yellow to light orange, not white or green.

Perform the stem test: a mature squash will have a dried, cork-like stem that's beginning to separate from the vine naturally. Never harvest by pulling the fruit—instead, use clean pruning shears to cut the stem, leaving 2-3 inches attached to help prevent rot during storage.

Harvest before the first hard frost, ideally on a dry morning after dew has evaporated. Handle carefully as the skin, while hard, can be damaged by rough handling. If light frost threatens but fruits aren't fully mature, they'll continue ripening in storage as long as they've reached full size and begun showing color change.

Storage & Preservation

Cure freshly harvested Burgess Buttercup in a warm, dry location (80-85°F) for 10-14 days to harden the skin and seal the stem end. After curing, store in a cool, dry place between 50-55°F with good air circulation—a basement, garage, or unheated room works perfectly.

Properly cured fruits will keep 5-8 months, often improving in sweetness during the first few months of storage. Check monthly and use any showing soft spots immediately.

For preservation, the dense, sweet flesh freezes excellently when cooked and pureed—roast halved squash cut-side down at 400°F until tender, then scoop out flesh and freeze in portions. The puree can be canned using tested recipes for winter squash, and dehydrated cubes make excellent additions to soups and stews throughout winter.

History & Origin

Burgess Buttercup squash originates from Japan, where it was developed from traditional kabocha varieties prized for their exceptional sweetness and creamy texture. The variety was introduced to American gardeners in the 1930s through seed catalogs, with Burgess Seed & Plant Company being among the first to popularize it in the United States, lending its name to this particular strain.

This heirloom represents centuries of Japanese breeding focused on developing winter squash with sweet potato-like qualities—dense, sweet flesh that could serve as both vegetable and dessert. In Japanese cuisine, kabocha-type squashes like Burgess Buttercup are considered premium ingredients, often simply steamed or roasted to showcase their natural sweetness.

The variety gained popularity among American gardeners during the 1960s-70s as interest in international vegetables grew. Today, it's considered one of the finest examples of Japanese breeding expertise, maintaining its original characteristics while adapting well to North American growing conditions. Its reliability and exceptional flavor have made it a treasured variety among seed savers and gourmet gardeners.

Advantages

+Exceptional sweetness that intensifies during storage, often reaching 12+ Brix sugar content
+Excellent 5-8 month storage life with proper curing, outlasting most winter squash varieties
+Distinctive turban shape and gray-green striped skin makes identification foolproof at harvest
+Dense, dry flesh that never becomes watery, perfect for roasting and baking applications
+Strong disease resistance particularly to common squash ailments like bacterial wilt
+High yields with 3-5 fruits per plant averaging 3-5 pounds each
+Versatile culinary applications from savory dishes to desserts and pie fillings

Considerations

-Requires extensive space with vines spreading 10-12 feet, making it unsuitable for small gardens
-Long 100-110 day maturity period limits growing in short-season areas
-Sensitive to transplant shock, making succession planting or replacement difficult
-Heavy fruits require support when grown vertically, adding complexity to space-saving methods
-Later harvest timing makes it vulnerable to early frost damage in northern climates

Companion Plants

Plant Together

Nasturtiums

Trap crop for squash bugs and cucumber beetles, repels aphids

Marigolds

Repel cucumber beetles, squash bugs, and nematodes with their strong scent

Radishes

Deter squash vine borers and cucumber beetles, mature before squash spreads

Beans

Fix nitrogen in soil to benefit heavy-feeding squash plants

Corn

Provides natural trellis support and creates beneficial microclimate

Catnip

Repels squash bugs, cucumber beetles, and ants effectively

Oregano

Repels cucumber beetles and provides ground cover to retain soil moisture

Sunflowers

Attract beneficial insects and provide natural windbreak protection

Keep Apart

Potatoes

Compete for space and nutrients, both are heavy feeders requiring similar soil resources

Fennel

Releases allelopathic compounds that inhibit squash growth and development

Aromatic herbs (mint, sage)

Strong oils can inhibit squash growth and compete aggressively for root space

Pests & Disease Resistance

Resistance

Good general disease resistance

Common Pests

Squash bugs, cucumber beetles, vine borers

Diseases

Powdery mildew, downy mildew, bacterial wilt

Frequently Asked Questions

How long does Burgess Buttercup squash take to grow?▼

Burgess Buttercup requires 100-110 days from seed to harvest, making it one of the longer-season winter squashes. In areas with shorter growing seasons (zones 6 and cooler), start seeds indoors 3-4 weeks before the last frost to ensure adequate growing time before fall frosts arrive.

Can you grow Burgess Buttercup squash in containers?▼

While possible, Burgess Buttercup is not ideal for container growing due to its vigorous 10-12 foot vining habit and large root system. If you must grow in containers, use a minimum 30-gallon container with sturdy trellising, but expect reduced yields and smaller fruits compared to ground-grown plants.

What does Burgess Buttercup squash taste like?▼

Burgess Buttercup offers an exceptionally sweet, creamy flavor often compared to sweet potatoes but with additional nutty undertones. The flesh is dense and dry rather than watery, with a smooth, almost custard-like texture when cooked. Its sweetness actually improves during storage, reaching sugar levels comparable to some fruits.

When should I plant Burgess Buttercup squash seeds?▼

Plant Burgess Buttercup seeds directly outdoors when soil temperature consistently reaches 65°F and all frost danger has passed. For shorter growing seasons, start seeds indoors 3-4 weeks before the last expected frost date. Count back 110-120 days from your first expected fall frost to determine your latest safe planting date.

Is Burgess Buttercup squash good for beginners?▼

Burgess Buttercup is moderately challenging for beginners due to its space requirements, long growing season, and need for consistent care. However, it's quite forgiving once established and has good disease resistance. New gardeners with adequate space and patience will find it rewarding, though starting with a more compact winter squash variety might be easier.

How do you know when Burgess Buttercup squash is ripe?▼

Ripe Burgess Buttercup displays full gray-green color with distinct darker stripes, skin hard enough to resist fingernail pressure, and a dried, cork-like stem. The ground spot should be creamy yellow to light orange, not white. The stem will begin naturally separating from the vine when fully mature, typically 100-110 days after planting.