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Pattypan Squash (Sunburst) · Zones 3–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | April – May | May – June | May – June | July – September |
| Zone 4 | April – May | May – June | May – July | June – September |
| Zone 5 | April – May | May – July | May – July | June – September |
| Zone 6 | March – June | April – July | May – July | June – October |
| Zone 7 | March – July | April – August | April – August | May – October |
| Zone 8 | February – August | March – September | March – September | May – November |
| Zone 9 | January – September | February – October | March – September | April – November |
| Zone 10 | January – October | February – November | March – October | April – December |
Complete Growing Guide
Start preparing your planting site in early spring by working compost or well-aged manure into the soil to a depth of 8-10 inches. Sunburst pattypan squash thrives in soil with a pH between 6.0-6.8, so test and amend if needed. Choose your sunniest spot—this variety needs those full 6-8 hours of direct sunlight to produce its signature bright yellow color.
For direct sowing, wait until soil temperature consistently reaches 65°F, typically 2-3 weeks after your last frost date. Plant seeds 1 inch deep in hills spaced 3-4 feet apart, sowing 4-5 seeds per hill. Once seedlings emerge and develop their first true leaves, thin to the two strongest plants per hill. If you're short on space, start seeds indoors 2-3 weeks before your last frost date using biodegradable pots to minimize transplant shock.
When transplanting, handle seedlings gently and plant them at the same depth they were growing in their containers. Water thoroughly and consider using row covers for the first week to ease the transition. Since Sunburst is a compact variety, it works beautifully in containers—use pots at least 20 gallons with excellent drainage.
Feed your plants with a balanced fertilizer (10-10-10) at planting, then switch to a lower-nitrogen formula once flowering begins to encourage fruit production over leaf growth. Side-dress with compost every 3-4 weeks throughout the growing season. Unlike vining squash, Sunburst grows in a neat bush form, so no traking or training is needed.
Avoid the common mistake of overhead watering, which promotes fungal diseases. Instead, use soaker hoses or drip irrigation to keep water at soil level. Mulch around plants with straw or shredded leaves to retain moisture and suppress weeds, but keep mulch 2-3 inches away from the main stem to prevent pest hiding spots.
To maximize yield, harvest fruits when they're 3-4 inches across—this encourages the plant to keep producing. Check plants daily during peak season, as summer squash can double in size overnight. In zones 9-10, you can succession plant every 2-3 weeks through summer for continuous harvests.
Harvesting
Harvest Sunburst pattypan squash when fruits measure 2-4 inches across for peak tenderness and flavor. Look for bright, glossy yellow skin with well-defined scalloped edges—dull skin indicates the fruit is past its prime. The skin should give slightly to gentle pressure but still feel firm overall. Perform the fingernail test: if your nail easily punctures the skin, it's ready; if the skin resists, the fruit has gotten too mature.
Harvest in the early morning when plants are fully hydrated and fruits are crisp. Use a sharp knife or pruning shears to cut the stem about 1 inch from the fruit—never twist or pull, as this can damage the plant and reduce future production. The stem should be green and fresh-looking, not brown or shriveled.
Check plants daily during peak season, as these productive plants can hide mature fruits under their large leaves. Even if you don't plan to eat them immediately, remove any fruits larger than 4 inches to keep the plant producing. Regular harvesting every 1-2 days will keep your Sunburst plants productive for 8-10 weeks through the growing season.
Storage & Preservation
Fresh Sunburst pattypan squash keeps best at room temperature for 3-5 days, maintaining optimal flavor and texture. For longer storage, refrigerate in a perforated plastic bag in the crisper drawer for up to one week, though the skin may become slightly tough.
For freezing, slice fruits into ½-inch rounds, blanch in boiling water for 3 minutes, then plunge into ice water before packaging. Frozen pattypan maintains quality for 10-12 months and works well in soups and casseroles.
Pickle small, tender fruits (1-2 inches) whole using standard cucumber pickle recipes—their unique shape makes stunning refrigerator pickles. You can also grate larger fruits and freeze the pulp for winter baking projects like zucchini bread, though the texture will be softer than traditional zucchini. Dehydrate thin slices at 125°F for crispy chips that make excellent snacks or soup garnishes.
History & Origin
Sunburst pattypan squash was developed by Burpee Seeds in the 1980s as an improvement on traditional white pattypan varieties that have been grown in North America since colonial times. The original pattypan squashes, also called scallop or custard marrow squashes, arrived with European settlers who brought seeds from varieties already popular in Mediterranean gardens.
Burpee's breeding program focused on creating a hybrid with the classic UFO shape gardeners loved but with enhanced disease resistance, more compact plant habit, and that distinctive bright yellow color that makes it so eye-catching at farmers markets. The 'Sunburst' name reflects both its sunny yellow color and the radiating scalloped pattern that resembles sun rays.
This variety helped revitalize interest in pattypan squashes during the 1990s specialty vegetable boom, when chefs and home gardeners began seeking out unique, visually striking vegetables. Today, Sunburst remains one of the most popular pattypan varieties, earning an All-America Selections award for its combination of ornamental appeal, reliable production, and excellent eating quality in small-space gardens.
Advantages
- +Compact bush habit perfect for containers and small gardens without sprawling vines
- +Exceptional productivity with continuous harvest over 8-10 weeks when picked regularly
- +Outstanding powdery mildew resistance compared to older pattypan varieties
- +Stunning bright yellow color intensifies rather than fades in full sun
- +Tender, edible skin even when fruits reach 4-5 inches across
- +Unique UFO shape makes every harvest feel special and commands premium prices at market
- +Excellent heat tolerance maintains production through summer heat waves
Considerations
- -Fruits can hide under large leaves, making daily inspection necessary to catch them at peak size
- -Yellow color shows blemishes and insect damage more readily than white or green varieties
- -Hybrid variety means you cannot save seeds for next year's planting
- -More susceptible to bacterial wilt transmitted by cucumber beetles than some squash types
- -Short shelf life of only 3-5 days at peak quality compared to winter squashes
Companion Plants
Plant Together
Nasturtiums
Repels squash bugs, cucumber beetles, and aphids while attracting beneficial predatory insects
Marigolds
Deters squash bugs, cucumber beetles, and nematodes with their strong scent
Radishes
Repels squash vine borers and cucumber beetles, quick harvest before squash spreads
Corn
Provides vertical structure and shade, part of traditional Three Sisters planting
Beans
Fixes nitrogen in soil to benefit heavy-feeding squash, completes Three Sisters guild
Catnip
Strongly repels squash bugs, cucumber beetles, and other common squash pests
Dill
Attracts beneficial insects like parasitic wasps that prey on squash pest larvae
Sunflowers
Provides shade and wind protection, attracts pollinators essential for squash fruit production
Keep Apart
Potatoes
Compete for similar soil nutrients and space, both are heavy feeders that deplete soil
Fennel
Releases allelopathic compounds that inhibit squash growth and development
Aromatic herbs (Sage)
Strong oils can inhibit squash growth and may interfere with pollinator attraction
Pests & Disease Resistance
Resistance
Good resistance to powdery mildew and some viruses
Common Pests
Squash bugs, cucumber beetles, aphids
Diseases
Bacterial wilt, squash mosaic virus, downy mildew
Frequently Asked Questions
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