Brussels sprouts (Brassica oleracea (Gemmifera Group)) — Plotwright

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Brussels sprouts

Habit (mature) · Jeffery Martin / Wikimedia Commons · CC0 1.0 (public domain dedication)

Limited coverage

Brussels sprouts

Brassica oleracea (Gemmifera Group)

A slow-growing, long-season cool-weather vegetable grown for the miniature cabbage-like buds (1-2 inches wide) that form in the leaf axils along a single 2-3 foot stem. It is the same species as kale, cabbage, broccoli, cauliflower, and kohlrabi, differing only by cultivar group. Flavor improves after the first fall frost, so it is timed for a cool-temperature autumn harvest rather than summer heat.

Review: Source-backed

Climate fit: moderate (56/100)

Edible

Light

Full sun

Water

Consistent moisture

Mature size

24-36" tall · 18" apart

Hardy in zones

2-11

brutally cold to nearly frost-free winters

Summer heat range

Cool-Mild

cool to mild summers Interim Plotwright tier until the plant AHS range is authored.

Native in Illinois

No

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Cold hardiness

Now

Zone 6b

USDA

Chicago, IL · 1991-2020 average annual coldest day

Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer

Well-suited

2050

Zone 7b

Plotwright

Your zone + climate-model shift · SSP3-7.0 (regional rivalry)

Well-suited

In plain terms: cold winters — coldest nights typically around -3°F.

✓

Well-suited today and still thriving in 2050.

Heat tolerance

°C

°F

Loading current AHS heat-zone and plant heat-fit data at your coordinates…

Where this plant fits

Suitable across 45 ecoregions — 45 climate-resilient through 2070. Best matches first.

Appalachian mixed mesophytic forests

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

California coastal sage and chaparral

Canadian Aspen forests and parklands

Central Pacific Northwest coastal forests

Central Tallgrass prairie

Central-Southern Cascades Forests

What it needs

Conditions

Light

Full sun

Water

Consistent moisture

Spacing

18"

Habit

Single upright stem with sprouts forming in the leaf axils; grown as a cool-season annual

Care tips

•

Time it for fall: set transplants out about 4 months before your first fall frost so sprouts mature in cool weather — Missouri Botanical Garden PlantFinder notes flavor improves after the first frost.

•

Keep soil uniformly moist all summer and feed nitrogen every 2-3 weeks in July and August for steady stem and sprout development.

•

Remove some lower leaves as the sprouts begin to swell, and mulch to protect the shallow roots and hold moisture.

Lifecycle

Planting

Best grown in organically rich, fertile, consistently moist, well-composted, well-drained loams in full sun; a soil pH of 6.5 is recommended (Missouri Botanical Garden PlantFinder). Seed may be started indoors in early May; seedlings or nursery transplants are planted outdoors in mid-June, about 4 months before the first fall frost date, spaced about 18 inches apart in rows about 3 feet apart.

Transplanting

Set out indoor-started seedlings or nursery transplants in mid-June (St. Louis timing) so the long-season crop matures into cool fall weather; apply mulch around plants to protect the shallow roots, reduce weeds, and retain soil moisture (Missouri Botanical Garden PlantFinder).

Early growth

Keep soils uniformly moist throughout the summer and apply nitrogen fertilizer at 2-3 week intervals during July and August. Some leaf removal is often done as the sprouts begin to develop (Missouri Botanical Garden PlantFinder).

Maturity

Sprouts form as miniature cabbage-like buds (1-2 inches wide) in the leaf axils along the 2-3 foot stem and are best harvested after the first fall frost, when flavor improves. Grown as an annual; it rarely flowers in cultivation (Missouri Botanical Garden PlantFinder).

Propagation

Propagated from seed (started indoors in early May for transplanting), the standard approach for this annually grown cool-season crop (Missouri Botanical Garden PlantFinder).

Sources & citations

Cite this page

For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.

Plotwright. (2026, May 17). Brussels sprouts (Brassica oleracea (Gemmifera Group)). Retrieved 2026, June 5, from https://plotwright.garden/plants/brussels-sprouts

Sources for every fact

Every fact on this page traces to a source. 18 fields cited — 18 source-backed.

Missouri Botanical Garden PlantFinder

Botanical research database

Backs 17 fields

Identity

Summary

Plant type

Light

Moisture

Hardiness

Heat zone

Size

Spacing

Habit

Design roles

Seasonal interest

Growth stages

Lifecycle

Regional guidance

Success tips

Designer notes

Wikimedia Commons

Photo · CC0 1.0

Backs 1 field

Image

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The photos above are our reviewed reference set, curated for accuracy.

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