Cucurbita spp.

Squash - Summer

In the diverse family of squash are true nutritional powerhouses, encompassing a wide array of forms, flavors, colorations, and culinary applications. Squash are rich in the carotenoids necessary for vitamin A production and boast a wide complement of amino acids. While starchy, most of the carbohydrates in the fruit come from special polysaccharides, pectins, which have exhibited strong antioxidant, anti-inflammatory, and anti-diabetic, insulin-regulating properties.

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The Growing Guide

Soil Temp for Germ 65–85°F
Seed Depth 1–1 ½"
Seed Spacing 3–4/hill
Days to Emergence 5–10
Thin Plants to 1–2/hill
Row Spacing 3–6'
Fertilizer Needs Medium
Minimum Germination 75%
Seeds per Gram Patty Pan: 7-10 • Romanesco: 4–5 • Yellow Summer: 7-15 • Zucchini: 5-8
Seed Life 3–4 years

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More About The Seeds & Plants

Summer Squash Disease Resistance Key

Cucumber Mosaic Virus Viral disease causing mottled, distorted cucumber leaves.
Powdery Mildew
Papaya Ringspot Virus Viral disease causing ring spots, distorted cucurbits.
Squash Leaf Curl Virus Viral disease causing leaf curling, yellowing, stunted growth.
Watermelon Mosaic Virus Viral disease causing mosaic patterns, stunting.
Zucchini Yellow Mosaic Virus Viral disease causing yellow mosaics, stunted growth.

* Numbers indicate specific disease race.

More About

Cucurbita spp.

Days to maturity are from date of direct seeding.

Culture
• Fertile, well-drained soil gives best results
• Squash is a warm season crop, so avoid planting too early; raised beds and plastic mulch help keep roots warm
• Squash are monoecious (bearing separate male and female flowers on the same plant) and require insect pollination
• Poor fruit set is often the result of inadequate pollination; plant bee attractant flowers

Direct Sowing
• Plant after frost danger when soil warms to 65°F
• Work in shovelful of compost and 1/2 cup TSC's Complete fertilizer into hill
• Keep soil evenly moist but not wet as too much moisture causes seed to rot
• Bush varieties: sow 3-4 feet apart
• Vining varieties: sow 4-6 feet apart

Transplanting
• Start indoors 3-4 weeks prior to anticipated transplant date in 4 inch pots
• Work in shovelful of compost and 1/2 cup TSC's Complete fertilizer into hill
• Transplant carefully as to not disturb roots

Insects & Diseases
• Common insects: Spotted and striped cucumber beetles, vine borers and squash bugs
• Insect control: Row covers and/or apply Pyrethrin
• Moschata species are resistant to vine borer
• Common diseases: See chart below; diseases vary by region
• Disease prevention: 3-4 year crop rotation, and fungicide applications

Harvest & Storage
• Summer squash: Harvest regularly when fruits are young to keep plants productive
• Winter squash: Leave on vine until fully mature, rinds should be firm
• When winter squash is mature cut stem leaving 2-4 inches remaining, gently wash in sanitizing solution; 10 parts water to 1 part bleach
• For best results move winter squash to a warm dry area 80-90°F to cure; see each type (below) for curing requirements
• Store winter squash at 50-60°F with 50-75% relative humidity and good air circulation

Curing Requirements
• Acorn: Curing not required; Stores 2-3 months
• Buttercup: Cure 10-14 days; Store 1-2 months for best flavor; Will keep 4-6 months
• Butternut: Cure 10-14 days; Store 1-2 months for best flavor; Will keep 4-6 months
• Delicata: Curing not required; Stores 2-3 months
• Hubbard: Cure 10-14 days; Store 1-2 months for best flavor; Will keep 4-6 months
• Kabocha: Cure 10–14 days; Store 1–2 months for best flavor; Will keep 4–6 months
• Mini-Hubbard: Curing not required; Stores 2-3 months
• Spaghetti: Curing not required; Stores 2-3 months

Approximate seeds per gram
• Acorn, Butternut, & Delicata: 9-16
• Buttercup & Hubbard: 3-7
• Green, Gray Summer: 7–9
• Kabocha: 5–7
• Patty Pan: 7-10
• Romanesco: 4–5
• Spaghetti: 4-7
• Yellow Summer: 7-15
• Zucchini: 5-8

KEY TO SQUASH DISEASE RESISTANCE AND TOLERANCE
HR indicates high resistance.
IR indicates intermediate resistance.
CMV | Cucumber Mosaic Virus
PM | Powdery Mildew
PRV | Papaya Ringspot Virus
SLCV | Squash Leaf Curl Virus
WMV* | Watermelon Mosaic Virus
ZYMV | Zucchini Yellow Mosaic Virus
* Numbers indicate specific disease race.

Tried and Tested

Our Favorite Summer Squash

Cash Machine is an employee favorite for its impressive productivity and consistent, high-quality harvests. The compact plants produce glossy, dark-green zucchini with tender texture and rich flavor. Easy to grow and quick to mature, it’s a reliable, garden-to-table favorite all season long.