How to Grow Mustard Greens: Planting, Spacing, Care & Harvest

Quick answer

Spring: direct sow last frost −6 to −2 (Purdue HO-186; about 6–2 weeks before last frost). Fall: plant at least 4–8 weeks before first fall frost (Purdue Table 2). Cool-season leafy green; harvest tender leaves in about 25–50 days (Clemson). Prefer cultural flea-beetle and aphid controls.

Mustard greens at a glance

PlantDirect sow: 6–2 wk before last frost; Direct sow (fall): 8–4 wk before last frost
SpacingExact mustard-only in-row inches are not on that page — follow your seed packet for thinning.
Days to harvest25–50 days from sowing (Clemson)
-9-8-7-6-5-4-3-2-1LF+1+2+3
■ Start indoors   ■ Plant out   ■ Harvest
Weeks relative to last frost (LF). Colored weeks show when our ZIP planner schedules each step.
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Planting dates for your ZIP: the ZIP planting planner counts each window from your local frost dates.

Organic pests and diseases: see also organic pest control. Use any product as the label directs.

Mustard greens plant (Brassica juncea)
Mustard greens (Brassica juncea). Photo: Krzysztof Ziarnek, Kenraiz, Wikimedia Commons, CC BY-SA 4.0 (resized).

Planting timing

Purdue HO-186 lists mustard under hardy (about 4–6 weeks before last spring frost) and semi-hardy (about 2–4 weeks) → spring Direct sow last frost −6 to −2 (about 6–2 weeks before last frost). Fall Table 2: mustard greens — plant at least 4–8 weeks before first fall frost →−8 to −4. (Purdue HO-186) Clemson greens calendars for South Carolina are regional (Piedmont spring Mar 12–June 30 / fall July 15–Sept 30) — label as regional; prefer HO-186 frost weeks for the planner. (Clemson greens)

Sun, soil and spacing

Clemson group greens: full sun; soil pH about 6.0–6.5; mulch; water deeply. Exact mustard-only in-row inches are not on that page — follow your seed packet for thinning.

Care and harvest

Cool weather crop. Clemson days about 25–50 from sowing. Harvest tender leaves; sow successively for a continuous crop. Prefer compost and a soil test; we omit printed synthetic fertilizer rates.

Pests and diseases

Flea beetles, caterpillars, aphids, slugs/snails (NC State); leaf spots, bacterial blight, black rot, crown/root rots (Clemson). Aphids: insecticidal soap or oil with thorough coverage (UC IPM aphids). Flea beetles: row cover on seedlings. Rotate off Brassicas. Use any product as the label directs.

Related: ZIP planner · organic pest control · turnips · kohlrabi · all grow guides

Frequently asked questions

When do I sow mustard greens?

Spring: about 6 to 2 weeks before last frost (Purdue). Fall: at least 4–8 weeks before first fall frost (Purdue).

How soon can I harvest?

About 25–50 days from sowing for tender leaves (Clemson).

More grow guides: All grow guides

Sources