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Mustard Black Seeds produce Brassica nigra, a pungent dual-purpose mustard for young or mature greens and small dark condiment seed. It is hotter and grows differently from the Red Giant leaf-mustard product.
Grow it successfully: Read the Mustard Black leaf and spice-seed guide.
Quick Grow Facts
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Plant Type: Cool-season annual edible mustard
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Scientific Name: Brassica nigra
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Seed Form: Raw seed; this describes the format and does not prove that a lot is untreated
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General Sowing Time: Use the regional leaf or seed window in the linked guide; the current packet states spring/autumn
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Position: Full sun; light afternoon shade for leaf quality as conditions warm
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Sow Depth: 1.5 cm, as stated on the current packet
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Spacing: Baby leaf 2–3 cm in rows 15–20 cm apart; mature leaves 15 cm × 30 cm; seed crop 15 cm × 30–45 cm
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Germination: 7–14 days; aim for about 13–20°C soil
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Harvest: Young leaves about 25–35 days; mature leaves about 40–60 days; begin checking dark seed pods around the packet’s 90–100-day estimate
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Height: The current supplier copy states up to 50 cm for the leafy crop; flowering seed stalks can grow much taller
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Seed Quantity - 5g raw seed: Approx 2 000 seeds
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Seed Quantity - 100g raw seed: Approx 40 000 seeds
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Seed Quantity - 1kg raw seed: Approx 400 000 seeds
Why Grow This Species
- Young leaves provide a pronounced mustard bite.
- Larger leaves suit cooked dishes.
- Mature dark seed can be dried for hot mustard and spice use.
- One sowing can be managed for leaves or for seed, but heavy leaf cutting and maximum seed production are different outcomes.
Growing Notes
- Direct-sow 1.5 cm deep and keep the seed zone evenly moist through emergence.
- For seed, stop cutting leaves when the flowering stalk rises and give tall plants wind shelter.
- Cut stalks when most pods are brown and seed is dark and hard, before brittle pods open.
- Do not eat packet seed or use it for jar sprouts; use home-grown spice seed only from a crop managed for edible seed.
Brought to you by Ubuntuberg Seeds, where our mission is to cultivate humanity & harvest unity. Ubuntuberg Seeds: the highest quality seed stock in all of Southern Africa, sourced from sustainable farms, guaranteeing you the best quality seed stock.
