VegetablesMustard Greens
Brassica juncea
Mustard greens (Brassica juncea) are a fast-growing annual leafy green with a hot, spicy flavor. Sow in spring or fall in full sun to part shade, and keep the soil evenly moist.
How to grow mustard greens
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Comparing Mustard Greens vs. Beefsteak Tomato
The comparison
| Fact | ![]() | ![]() |
|---|---|---|
| Difficulty | Easy | Moderate |
| Life cycle | Annual | Annual |
| Germination time | 7–10 days | 6–12 days |
| Germination temperature | 13–18 °C55–64 °F | 24–32 °C75–90 °F |
| Sowing depth | 1.5 cm½ in | 3 mm⅛ in |
| Spacing between plants | Not yet verified | 46–61 cm1½–2 ft |
| Days to maturity | 25–50 days from sowing | 65–90 days from transplanting |
| Sun | Full sun, partial shade | Full sun |
| Water | Moderate | Moderate |
| Containers | Yes | Yes, 19 L or largerYes, 5 gal or larger |
| Frost tolerance | Not yet verified | Tender (no frost) |
| Soil pH | pH 6.0–8.0 | pH 5.8–6.8 |
| Links |
Up close
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VegetablesBrassica juncea
Mustard greens (Brassica juncea) are a fast-growing annual leafy green with a hot, spicy flavor. Sow in spring or fall in full sun to part shade, and keep the soil evenly moist.
How to grow mustard greens
VegetablesSolanum lycopersicum
Beefsteak tomatoes are large-fruited tomatoes grown from seed indoors and moved outside after frost. They need full sun, steady moisture, and a long warm season.
How to grow beefsteak tomatoKeep comparing
Add a third seed, or swap one for a close relative from the same category.


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Mustard Greens vs. Acorn SquashMustard Greens against another vegetable
Beefsteak Tomato vs. Acorn SquashBeefsteak Tomato against another vegetable
Mustard Greens vs. Armenian CucumberMustard Greens against another vegetableThe table, row by row
Every row is a fact from each seed's own profile, lined up so the differences stand out.
Germination time and temperature
How many days the seeds take to sprout, and the temperature range they sprout in.
Sowing depth and spacing
How deep to sow each seed and how far apart the plants should grow. “On the surface” means the seed isn't covered.
Days to maturity and life cycle
How long until the plant is ready, counted from sowing or from transplanting (each value says which). Annuals live one year, biennials two, perennials longer.
Sun and water
Full sun means 6 or more hours of direct sun a day, partial shade a few hours. Water needs are rated low, moderate or high.
Containers, frost tolerance and soil pH
Whether it grows in a pot, with the smallest pot when it's known. Frost tolerance runs from tender (no frost) to hardy. Soil pH 7 is neutral.
Toxicity to cats and dogs
Whether the plant is toxic to cats and dogs.
Quick wins
Days from sowing until the first shoots appear, in good conditions.
Pet friendly
Listed as non-toxic to both cats and dogs. Each seed's page has the details.
Not safe for pets: borage, buckwheat, caraway, carnation and 14 more.
Comparing
Each seed's page explains how to grow it from seed, with facts researched and reviewed by our editors.