Winter Squash

Understanding the growth habit of your hard squash is critical for garden planning. These plants generally fall into three categories: Bush, Semi-Bush, and Vining.

• Cucurbita pepo (Bush/Semi-Bush): This group includes Acorn, Delicata, and Spaghetti squash. Most modern varieties are "bush" types, meaning they grow in a compact mound rather than sending out long runners. This makes them the best choice for raised beds or small garden plots.
• Cucurbita moschata (Vigorous Vining): Including Butternuts and Seminole pumpkins, these are aggressive "vining" plants. They produce long runners that can easily stretch 15–20 feet. They are highly heat-tolerant and have solid stems that offer natural resistance to squash vine borers.
• Cucurbita maxima (Aggressive Vining): This species includes the Candy Roaster and Hubbards. These are the "space eaters" of the garden, producing massive, thick vines. They require the most room to roam but produce the largest, most calorie-dense hard squash.
• Cucurbita argyrosperma (Vining): The Cushaw family. These are vigorous viners known for their ability to thrive in the extreme heat and humidity of the South.

Direct Sow: Most winter squash varieties should be direct seeded once the soil temperature is consistently above 70°F.

Pro Tip: In the South, you can often get two crops. Plant your first round in mid-March to April, and a second "fall" crop in July or August to ensure a fresh harvest for Thanksgiving.

Soil Requirements:

pH between 6.0–6.5

Rich in compost or organic matter

Well-draining, loamy soil

Fertilizer Schedule:

Before Planting:
Mix 1½ cups of HOSS Complete Organic Fertilizer per 10 ft of row

2 Weeks After Transplanting:
Side-dress with 2 cups of HOSS Complete Organic Fertilizer per 10 ft row.

If using Fertilizer injector, 1 cup 20-20-20 Fertilizer and 1-2 cups microboost per 20 ft row.

Alternate Every 14–21 Days:
Mix 1 cup of Hoss Premium Calcium Nitrate –AND – 1 to 2 cups of Hoss Micro-Boost Micronutrient Supplement per 20 ft. of row.

Pro Tip: Squash plants produce both male and female flowers. If you see tiny squash falling off the plant, it’s often due to poor pollination. Attract bees to your garden by planting wildflowers nearby!

For all hard squash, the universal rule of thumb is to always leave 2–3 inches of stem attached. Never carry the squash by the stem; if it breaks off, the fruit will likely rot within days. Use a clean, sharp knife or bypass loppers to make a clean cut.

Cucurbita pepo (Acorn, Spaghetti, Delicata)

These varieties have the thinnest skins and the shortest shelf life among the hard squash categories.

Harvest: Pick when the rind is hard enough to resist a fingernail puncture and the "ground spot" (the side touching the soil) turns from pale green to a creamy orange or yellow.
Curing: Do not cure. Unlike larger varieties, high-heat curing will actually decrease the quality of C. pepo species, making the flesh stringy and reducing the storage life. Simply wipe them clean of any field dirt.
Storage: Store in a cool, dry area (50–55°F). These are best consumed within 1–2 months of harvest.

Cucurbita moschata (Butternut, Seminole, South Anna)

Known as the "marathon keepers," these are the most reliable for long-term winter eating.

Harvest: Harvest once the skin turns a uniform tan or buff color and loses its shiny "waxy" sheen. The stem should feel woody and dry.
Curing: Critical. Cure in a warm (75–85°F), dry location with high airflow for 10–14 days. This process allows excess moisture to evaporate and converts starches into the sugars that give Butternuts their signature sweetness.
Storage: These are the longest-storing hard squash, lasting 6+ months in ideal conditions (50–55°F).

Cucurbita maxima (Candy Roaster, Hubbard, Buttercup)

These varieties are famous for their massive size and the fact that their flavor actually improves after they have been in storage for a few weeks.

Harvest: Look for "corking" on the stem (small, dry, brown cracks). The rind should be completely dull and impossible to puncture with a thumbnail.
Curing: Cure for 7–10 days at roughly 80°F. Curing these types toughens the rind significantly, protecting the dense flesh inside from pathogens.
Storage: These typically stay at peak quality for 3–5 months. Many growers find that the flavor peaks about 30 days after harvest as the internal starches continue to break down into sugar.

Cucurbita argyrosperma (Cushaw)

A Southern staple, these are prized for their resilience and large, edible seeds.

Harvest: Harvest when the vines have completely died back and the skin has hardened. The neck of the squash should feel solid and heavy.
Curing: Benefit from a 7-day cure in a warm, dry area to help dry out the large stem and seal the rind.
Storage: Because they have a higher water content than Butternuts, they should be used within 2–4 months.

Pro Storage Tip: Regardless of the species, never store hard squash directly on a concrete floor. Concrete wicks moisture and stays cold, which can lead to "chilling injury" or bottom-rot. Always use cardboard, wooden pallets, or wire shelving to maintain airflow around the entire fruit.

Crop Rotation: Rotate your squash every year. Avoid planting in spots where any member of the cucurbit family (cucumbers, melons, watermelons) grew recently.

Maintenance: Practice "Burying the Vines." If you have space, throw a shovel of soil over the vine joints. This encourages secondary rooting, which can save the plant if the main stem is attacked by squash vine borers.

End of Season: Remove all old vines from the garden immediately after harvest to prevent pests from overwintering in the debris.