Mustard family
Overview
The mustard family, Brassicaceae, is a large group of cool-season plants that includes mustards, cabbage, broccoli, kale, radish, and many common weeds. Known for cross-shaped flowers and pungent flavor, these herbs offer edible leaves, roots, seeds, and blossoms, plus valuable uses as cover crops and pollinator plants.
Characteristics
Known for four-petaled cross-shaped flowers, pungent sulfur-rich glucosinolates, and seed pods (siliques/silicles) that split to release numerous small seeds.
Region
Widely distributed and cultivated worldwide, especially in temperate regions of Europe, Asia, and North America, but also grown in many other suitable climates.
Natural Habitat
Commonly found in open, sunny habitats such as fields, roadsides, disturbed ground, grasslands, and agricultural areas rather than forests or wetlands.
Cultivation
Prefers full sun, evenly moist but well-drained soil (about 1–1.5 inches water per week), and fertile loam with slightly acidic to neutral pH (around 6.0–7.5).
Uses and Benefits
Used as both food and medicine, this family offers a lot of value in a small seed or leaf. Many of its benefits come from sulfur-rich glucosinolates, which give that sharp, mustardy bite and support our bodies’ natural detox pathways.5
- Culinary uses: Seeds flavor pickles and condiments, and can be pressed into pungent mustard oil.3 Tender greens from mustards, kale, and related plants are delicious raw or lightly cooked, while roots like radish and horseradish add heat and crunch.
- Nutritional support: Mustard-family vegetables are rich in vitamin C, vitamin K, folate, and calcium, along with carotenoids such as beta-carotene and lutein.11 Their isothiocyanates, including sulforaphane, are being studied for anti-cancer and anti-inflammatory activity.510
- Topical and traditional uses: Mustard plasters made from ground seed have long been used to warm tight muscles and the chest, though they can irritate sensitive skin.12
Cultivation Tips
Start mustard-family herbs from seed in cool weather. Sow in early spring or late summer, aiming for daytime temperatures around 10–24 °C (50–75 °F) to reduce bolting and keep flavors mild.6 Choose a sunny spot with fertile, well-drained loam and a soil pH close to neutral; add compost before planting to boost organic matter and nutrients.78
- Sowing: Direct-sow seeds 0.6–1.3 cm (¼–½ in) deep in moist soil. Thin seedlings promptly so crowded plants don’t become weak or misshapen.16
- Spacing: Give leafy mustards 15–30 cm (6–12 in) between plants; radishes need only 2.5–5 cm (1–2 in). Larger brassicas like cabbage or broccoli need 30–45 cm (12–18 in).7
- Water: Keep soil evenly moist, supplying about 2.5–3.8 cm (1–1.5 in) of water per week, especially during germination and early growth.7
- Feeding: Side-dress with a nitrogen-rich organic fertilizer 3–4 weeks after planting to support leafy growth, but avoid overdoing it late in the season.17
Mulch with straw or shredded leaves to hold moisture, cool the soil, and cut down on weeds. In hot climates, provide light afternoon shade and use succession sowing every few weeks for a steady harvest. Rotate mustard-family crops through your beds, waiting at least 3–4 years before replanting in the same spot to help prevent soil-borne diseases like clubroot.8
Companion Planting
Members of the mustard family pair well with plants that either feed the soil, confuse pests, or make smart use of space.
Shallow‑rooted mustards grow happily alongside deep‑rooted crops like carrots or parsnips, which pull nutrients from lower soil layers. Legumes such as peas and beans fix nitrogen and leave the soil richer for heavy‑feeding brassicas in the same bed or the following season.7
Alliums—garlic, onions, leeks, and chives—are classic companions. Their pungent scents can help deter aphids and some caterpillars, and they slot neatly between rows of cabbage, kale, or mustard greens.18 Aromatic herbs like dill, sage, thyme, and rosemary, plus flowers such as marigold and nasturtium, create a mixed planting that confuses flying pests and attracts beneficial insects.18
Avoid placing mustards next to other brassicas (broccoli, cabbage, radish) if possible; grouping them tightly can invite shared pests and diseases such as clubroot.8 Instead, weave mustard family plants through beds of lettuce, spinach, beets, or onions.
Rotate all Brassicaceae out of the same spot for at least three to four years to keep soils and plants healthy.8
Seasonal Considerations
Most mustard family herbs prefer cool, mild weather and grow best at temperatures between 50–75 °F (10–24 °C).6 In many temperate gardens, that means two main sowing windows: early spring and late summer for fall harvest.
- Spring: Sow as soon as the soil can be worked; protect young plants from hard frost with row covers.
- Summer: Avoid peak heat; in hot climates, wait until late summer and offer light afternoon shade.6
- Fall: Expect sweeter, milder leaves after light frosts, as cold can improve flavor.6
- Winter: In mild regions, hardy brassicas can overwinter with mulch or low tunnels, then send up edible flower shoots in early spring.6
Prolonged heat and lengthening days trigger bolting, so regular watering, shade cloth, and quick-maturing or bolt-resistant varieties help you stretch the harvest season.6
Issues and Troubleshooting
Common issues & troubleshooting
Holes in leaves
Tiny “shot holes” usually mean flea beetles. Larger, ragged holes signal cabbage worms or loopers.2021
Use floating row covers, mulch, and hand-picking. For heavier infestations, apply Bacillus thuringiensis (Btk) for caterpillars or an approved organic spray for beetles.
Stunted, yellowing plants
Often caused by low nitrogen, drought, or overcrowding.717
Feed with a balanced, nitrogen-rich fertilizer, thin seedlings, and keep soil evenly moist.
Plants wilt or fail despite good care
If roots look swollen and distorted, suspect clubroot. Raise soil pH with lime, improve drainage, and rotate out of all Brassicaceae for 3–4 years.8
Leaves with V-shaped yellow/brown patches
Likely black rot.22 Remove and destroy infected plants, avoid overhead watering, and start with clean seed.
Bolting (early flowering)
Triggered by heat or stress; once bolted, leaves turn tough and bitter.6
Plant in cooler seasons, water regularly, and choose bolt-resistant varieties where possible.
History and Folklore
The mustard family has walked beside people for thousands of years. Archaeological finds link mustard seeds to ancient kitchens in the Indus Valley, Mesopotamia, and Egypt, where they flavored food and likely medicine.24
Over time, wild coastal cabbages along the Mediterranean gave rise to familiar garden brassicas like cabbage, kale, and broccoli, all shaped by patient selection.23
Mustard’s tiny seed later became a powerful symbol of faith and potential in Christian teaching, while in South Asia the plant’s oil and seeds wove into rituals of blessing, marriage, and everyday cooking.2526 European folk healers relied on fiery mustard plasters to “draw out” illness, and stories told of scattered mustard seeds confusing witches and warding off harm.1227
References
1. Warwick, Suzanne I., and Ihsan A. Al-Shehbaz. “Brassicaceae: Mustard Family.” Flora of North America, vol. 7, Oxford UP, 2010.
2. APG IV. “An Update of the Angiosperm Phylogeny Group Classification for the Orders and Families of Flowering Plants.” Botanical Journal of the Linnean Society, vol. 181, no. 1, 2016, pp. 1–20.
3. Hemingway, James S. “Mustard.” Encyclopedia of Food Sciences and Nutrition, edited by Benjamin Caballero, 2nd ed., Academic Press, 2003, pp. 4087–4092.
4. Gómez-Campo, César, editor. Developments in Plant Genetics and Breeding: Biology of Brassica Coenospecies. Elsevier, 1999.
5. Fahey, Jed W., et al. “Glucosinolates: Chemistry, Biology, and Implications for Human Health.” Phytochemistry, vol. 56, no. 1, 2001, pp. 5–51.
6. Maynard, Donald N., and George J. Hochmuth. Knott’s Handbook for Vegetable Growers. 5th ed., Wiley, 2006.
7. Kemble, Joseph M., et al. “Commercial Production of Brassica Leafy Greens.” Alabama Cooperative Extension System, ANR-1446, 2012.
8. Dixon, Geoffrey R. “The Occurrence and Economic Impact of Plasmodiophora brassicae and Clubroot Disease.” Journal of Plant Growth Regulation, vol. 28, 2009, pp. 194–202.
9. Shahidi, Fereidoon. “Rapeseed and Canola.” Bailey’s Industrial Oil and Fat Products, edited by Fereidoon Shahidi, 6th ed., Wiley, 2005.
10. Dinkova-Kostova, Albena T., and Paul Talalay. “Perspectives in the Prevention of Cancer by Sulforaphane and Other Organosulfur Compounds from Cruciferous Vegetables.” Phytochemistry Reviews, vol. 7, 2008, pp. 213–229.
11. U.S. Department of Agriculture, Agricultural Research Service. “FoodData Central: Mustard Greens, Raw.” FoodData Central, 2020.
12. Grieve, M. A Modern Herbal. 1931. Dover, 1971.
13. Hynes, Patricia. “Ornamental Kale and Cabbage.” University of Minnesota Extension, 2018.
14. Brown, Paul D., and Mark J. Morra. “Glucosinolate-Containing Plant Tissues as Bioherbicides.” Journal of Agricultural and Food Chemistry, vol. 45, 1997, pp. 2768–2774.
15. Salt, David E., et al. “Phytoremediation: A Novel Strategy for the Removal of Toxic Metals from the Environment Using Plants.” Bio/Technology, vol. 13, 1995, pp. 468–474.
16. Cornell Cooperative Extension. “Radish and Mustard Production Guide.” Cornell University, 2013.
17. Hochmuth, George J., et al. “Fertilization of Brassica Crops.” University of Florida IFAS Extension, HS-761, 2010.
18. Finch, S., and R. H. Collier. “Host-Plant Selection by Insects—A Theory Based on ‘Appropriate/Inappropriate Landings’ by Pest Insects of Cruciferous Plants.” Entomologia Experimentalis et Applicata, vol. 96, 2000, pp. 91–102.
19. Shelton, Anthony M., and Fayssal R. Badenes-Perez. “Concepts and Applications of Trap Cropping in Pest Management.” Annual Review of Entomology, vol. 51, 2006, pp. 285–308.
20. Sorensen, Kenneth A., et al. “Flea Beetles on Vegetables.” North Carolina Cooperative Extension, ENT/veg-28, 2009.
21. Talekar, N. S., and A. M. Shelton. “Biology, Ecology, and Management of the Diamondback Moth.” Annual Review of Entomology, vol. 38, 1993, pp. 275–301.
22. Williams, Paul H. “Black Rot: A Continuing Threat to World Crucifers.” Plant Disease, vol. 64, no. 8, 1980, pp. 736–742.
23. Purugganan, Michael D., and Dorian Q. Fuller. “The Nature of Selection during Plant Domestication.” Nature, vol. 457, 2009, pp. 843–848.
24. Zohary, Daniel, et al. Domestication of Plants in the Old World. 4th ed., Oxford UP, 2012.
25. The Holy Bible. New Revised Standard Version, HarperOne, 2007.
26. Banerji, Chitrita. Eating India: Exploring a Nation’s Cuisine. Bloomsbury, 2007.
27. Frazer, James George. The Golden Bough: A Study in Magic and Religion. Macmillan, 1922.
28. Meinke, David W., et al. “Arabidopsis thaliana: A Model Plant for Genome Analysis.” Science, vol. 282, no. 5389, 1998, pp. 662–682.
Nicolas Duval
Nicolas is a passionate advocate for nature and the art of wildcrafting. His dedication shines through in Wildcraftia, a website he meticulously crafted to serve as a haven for nature enthusiasts worldwide. Driven by a deep appreciation for nature’s connection to humanity, Nicolas embarked on his journey in 2011 with SmokableHerbs, a platform showcasing his love for nature’s bounty. Building upon this foundation, he established Smokably, a thriving online store offering premium herbs and blends to a global audience.