Mustard greens
Brassica juncea
A fast, erect cool-season annual in the mustard family (Brassicaceae), introduced to all of North America from Eurasia and grown widely as a leafy vegetable. NC State Extension describes a rapid-growing plant about 1-1.5 feet tall and wide with large (over 6 inches) leaves — lobed lower leaves and shorter-stalked upper leaves, smooth with a whitish bloom and sometimes purple veins or fully purple coloring. It does best in the cool of fall and spring and bolts in summer heat, throwing up terminal clusters of small four-petaled yellow flowers and developing a strong, spicy flavor. The leaves, seeds, flowers, and stems are all edible raw or cooked, making it a productive, peppery green for the edible garden.
Edible
Container
Filler
Light
Full sun / Part shade
Water
Consistent moisture
Mature size
12-18" tall · 10" apart
Hardy in zones
Annual; grown as a cool-season leaf crop
AHS heat range
1-6
Plant range authored in AHS heat-zone terms.
Native status
Cultivated — no wild native range
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A productive, peppery leaf vegetable.
Cold hardiness
This plant is grown as an annual; hardiness zones don't apply.
Heat tolerance
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
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Similar plants
Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
Ipomoea batatas
Sweet potato
A tender, tuberous-rooted morning-glory relative native to tropical America and cultivated for its starchy edible storage roots for over 2,000 years. Trailing stems mound only about 9 inches tall but sprawl 8 to 10 feet wide, rooting at the nodes, with heart-shaped to palmately-lobed leaves. The species occasionally bears pale-pink-to-violet trumpet flowers, though most cultivars rarely bloom. Winter hardy only to USDA Zones 9-11, it is grown as a warm-season annual everywhere colder.
Cichorium endivia
Endive
A leafy cool-season salad green in the daisy family (Asteraceae), grown as an annual (sometimes biennial) for its mildly bitter, edible rosette of leaves. NC State Extension describes an erect, rapid-growing plant about 10 inches to 2 feet tall, with two main leaf forms: the narrow, curly, dark-green leaves of the frisée types (var. crispum) and the broad, flat leaves of escarole (var. latifolium). It is native to the eastern Mediterranean and India and grows best at cool temperatures around 60-65°F, finishing a crop in about 70-100 days. The leaves are eaten raw or cooked, and growers often blanch the heads to soften the natural bitterness before harvest.
Lactuca sativa
Garden lettuce
A cool-season leafy green eaten raw or lightly cooked — among the most fundamental garden vegetables. Bolts (sends up flower stalks) + turns bitter in heat above 70°F per NC State; cool-spring + cool-fall windows are the productive growing periods in most North American climates. Four habit groups: head (iceberg, crisphead), loose-leaf, romaine (cos), and butterhead (Bibb, Boston).
Spinacia oleracea
Spinach
A fast, cool-season leafy annual grown for its tender, vitamin-rich basal rosette of leaves — an excellent source of vitamins A, B, and C plus iron and phosphorus per the Missouri Botanical Garden. Cultivated in Europe since the 1400s and probably native to western Asia, it crops best in the cool temperatures of spring and fall and bolts (sends up greenish-yellow flower spikes of no ornamental value) once summer heat arrives, after which the leaves deteriorate.
Ocimum basilicum
Genovese basil
A tender warm-season culinary herb native to tropical Africa and Asia; grown as an annual in most US climates for fragrant edible leaves and as a kitchen-garden staple. Sweet basil is the species behind Genovese, Thai, and most ornamental purple basils.
Eruca vesicaria
Arugula
A fast cool-season annual of the mustard family grown for its peppery, mustard-like salad greens — irregular, pinnately-lobed basal leaves in a low rosette, each with 4 to 10 small lateral lobes and a large terminal lobe (Missouri Botanical Garden). First cultivated by the ancient Greeks and Romans and still widely grown across Europe, it is best grown in the cooler spring and fall months rather than summer heat; leaves are harvested young and tender before they turn strong and bitter. Pale-yellow four-petalled flowers with dark brown or purple veins appear in corymbs if plants are left to bloom.
Sources & citations
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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). Mustard greens (Brassica juncea). Retrieved 2026, June 24, from https://plotwright.com/plants/brassica-juncea
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
NC State Extension Gardener Plant Toolbox
University extension service
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
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Lifecycle
Regional guidance
Success tips
Designer notes