Long Island Improved is a time-tested heirloom Brussels sprout variety known for its compact plants, high yield, and excellent cold tolerance. It produces tightly packed, flavorful sprouts along sturdy stems—perfect for roasting, sautéing, or freezing.

Quick Facts

• Botanical name: Brassica oleracea var. gemmifera

• Common name: Brussels Sprouts 'Long Island Improved'

• Plant type: Cool-season biennial grown as annual

• Days to maturity: 90–110 days

• Plant height: 24–36 inches

• Sun exposure: Full sun

• Hardiness zones: USDA 3–10

• Spacing: 18–24 inches apart

When to Plant

• Spring planting: Start seeds indoors 6–8 weeks before last frost, transplant outdoors when soil warms.

• Fall planting: Sow directly or transplant 12–14 weeks before first expected frost for best flavor.

• Germination time: 7–14 days at 60–75°F (16–24°C)

How to Plant

1. Soil preparation: Fertile, well-drained soil with compost or aged manure. pH 6.5–7.5 preferred.

2. Sowing depth: 1/4–1/2 inch deep.

3. Transplanting: Space 18–24 inches apart in rows 30 inches apart.

4. Watering: Keep soil consistently moist throughout the growing season.

Growing Tips

• Cool weather is key: Sprouts develop best in cool temps (ideally under 75°F).

• Remove lower leaves as sprouts begin to form for improved airflow.

• Topping tip: Pinch off the growing tip 3–4 weeks before final harvest to encourage larger sprout development.

• Apply mulch to regulate soil temperature and retain moisture.

Harvesting

• Begin harvesting from the bottom of the stalk upward when sprouts are 1–2 inches in diameter and firm.

• Snap or cut off sprouts; they store well refrigerated or can be blanched and frozen.

• Flavor improves after light frosts.

Culinary Use

• Best when roasted, sautéed, steamed, or shredded.

• Sweetens with cool weather — ideal for fall and winter harvests.

• Excellent for meal prep and long-term storage.

Companion Plants

Good companions: carrots, onions, dill, and beets.
Avoid: strawberries, tomatoes, and pole beans.

Why Grow ‘Long Island Improved’ Brussels Sprouts?

This heirloom variety is productive, compact, and cold-hardy—perfect for fall and winter gardens. Its richly flavored sprouts are nutritious, delicious, and store well, making it a favorite among home gardeners and chefs alike.