Spinach - Giant Winter (Organic)

~120 Organic Seeds

Giant Winter Spinach Seeds (Organic)

Giant Winter Spinach (Spinacia oleracea) is a classic heirloom spinach variety prized for its exceptional cold hardiness, large dark green leaves, and reliable production during cooler months. If you're looking for spinach seeds that thrive in autumn, winter, and early spring, Giant Winter is one of the best choices available.

True to its name, Giant Winter Spinach produces impressively large leaves that can approach the size of Swiss chard under ideal growing conditions. The leaves are thick, slightly savoyed, richly coloured, and packed with flavour, making them excellent for fresh salads, smoothies, soups, sautés, and cooked dishes.

This variety performs exceptionally well in cold frames, greenhouses, polytunnels, raised beds, and outdoor gardens throughout Canada. Many gardeners direct sow in late fall for an extra-early spring harvest.

For more leafy greens, browse our Lettuce, Spinach & Arugula Seeds Collection.

Scientific Profile

Feature	Details
Common Name	Giant Winter Spinach
Botanical Name	Spinacia oleracea
Plant Type	Cool-season annual vegetable
Seed Count	Approximately 120 seeds
Certification	Certified Canada Organic (PACS 16-205)
Days to Harvest	Approximately 45 days
Germination Time	Up to 14 days
Seed Depth	½ inch (1.3 cm)
Plant Spacing	2 inches minimum
Mature Height	10–16 inches
Leaf Type	Large, dark green, slightly savoyed leaves
Sun Requirements	Full sun to partial shade
Cold Hardiness	Excellent
Best Seasons	Fall, winter, early spring
Best Uses	Fresh eating, cooking, overwintering crops

Spinach consistently ranks among the most nutrient-dense vegetables available. It naturally contains vitamin K, vitamin A, folate, iron, magnesium, potassium, and antioxidants such as lutein and zeaxanthin. According to USDA FoodData Central, spinach is one of the most nutrient-rich leafy greens commonly consumed.

Why Grow Giant Winter Spinach?

Unlike many spinach varieties that struggle during temperature swings, Giant Winter Spinach was specifically selected for outstanding cold tolerance. Gardeners frequently grow it under row covers, cold frames, greenhouses, or simple mulch protection throughout winter.

Its ability to survive freezing temperatures and resume vigorous growth when conditions improve makes it one of the best spinach varieties for extending the growing season in Canada.

Many gardeners direct sow Giant Winter Spinach in late fall or early winter and enjoy harvests several weeks before spring-planted spinach is ready.

How to Grow Giant Winter Spinach From Seed

Sow Giant Winter Spinach seeds outdoors as soon as the soil can be worked in spring. For overwintering harvests, sow in late summer, autumn, or even early winter depending on your region.

Plant seeds approximately ½ inch deep in fertile, well-draining soil enriched with compost or organic matter. Keep soil consistently moist during germination, which typically occurs within 7–14 days.

Spinach prefers cool weather and grows best when temperatures remain moderate. Giant Winter Spinach can tolerate frost and freezing conditions far better than most leafy greens.

For season extension, consider pairing this variety with crops from our Container Garden Collection or growing under simple cold protection.

How to Harvest Giant Winter Spinach

Harvest Giant Winter Spinach using the cut-and-come-again method for maximum production.

Begin harvesting outer leaves once they reach a usable size, leaving the growing centre intact. This encourages continued growth and multiple harvests from the same planting.

Regular harvesting helps maintain tender leaves and encourages fresh growth throughout the season.

Under protected winter growing conditions, many gardeners harvest leaves continuously from fall through spring.

Giant Winter Spinach Growing Stages

Stage	What to Expect
Germination	Seeds emerge within 7–14 days
Seedling Stage	First true leaves begin developing
Leaf Development	Large dark green leaves rapidly expand
Harvest Stage	Outer leaves can be harvested repeatedly
Winter Dormancy	Growth slows during extreme cold
Spring Regrowth	Rapid growth resumes as temperatures rise
Bolting Stage	Flower stalks appear in warm weather

Fertilizer for Giant Winter Spinach

Because spinach is harvested for its foliage, nitrogen-rich soil supports the strongest growth. Before planting, incorporate compost or well-aged organic matter into the planting area.

Consistent moisture and fertile soil generally produce better results than aggressive fertilization. A balanced organic fertilizer can help maintain vigorous leaf production throughout the season.

For more information, read our Organic Fertilizer Guide.

Best Uses for Giant Winter Spinach

• Winter vegetable gardens
• Cold frames and greenhouses
• Fresh salads
• Green smoothies
• Soups and stews
• Sautéed spinach dishes
• Pasta recipes
• Freezing for winter storage
• Cut-and-come-again harvesting

The large leaves and strong flavour make Giant Winter one of the best spinach varieties for both fresh eating and cooking.

Quick Planting Instructions

• Sow outdoors as soon as soil can be worked.
• Plant seeds approximately ½ inch deep.
• Space plants at least 2 inches apart.
• Grow in full sun to partial shade.
• Keep soil consistently moist.
• Harvest outer leaves regularly.
• Use row covers or cold frames for winter harvests.
• Direct sow in fall for early spring production.

FAQs

How cold hardy is Giant Winter Spinach?

Giant Winter Spinach is one of the most cold-hardy spinach varieties available and can survive freezing temperatures, especially when protected with mulch, row covers, or cold frames.

Can Giant Winter Spinach be grown through winter?

Yes. Many Canadian gardeners grow it throughout winter in greenhouses, cold frames, polytunnels, or under simple frost protection.

How long does Giant Winter Spinach take to mature?

Plants are typically ready for harvest in approximately 45 days, although baby leaves can be harvested earlier.

Can I harvest Giant Winter Spinach multiple times?

Absolutely. Harvest outer leaves while leaving the growing centre intact to encourage continuous production.

Is Giant Winter Spinach organic?

Yes. These seeds are Certified Canada Organic through PACS certification standards.

What is the best spinach variety for winter growing?

Giant Winter Spinach is widely considered one of the best spinach varieties for winter gardens due to its exceptional cold tolerance and reliable regrowth in early spring.

Related Products

Looking to build a productive cool-season garden? Pair Giant Winter Spinach with these complementary varieties.

• Monstrueux de Viroflay Spinach Seeds
• Big Leaf Spinach Seeds – Vancouver Variety
• Buttercrunch Lettuce Seeds