Mustard greens originally hail from Europe but are now grown throughout North America where gardeners prize the plants for their fast growth and low maintenance nature, according to the University of Arkansas. This cool weather-loving plant thrives when the soil ranges between 55 and 75 degrees Fahrenheit, according to Utah State University. Though you can purchase mustard seedlings in most nurseries, sowing seeds yourself is often more economical.
Choose a garden site. Mustard greens prefer well-drained, sunny soil, according to the University of Arkansas.
Prepare the garden soil, beginning several weeks before the last frost date in your area. Utah State University suggests planting mustard three weeks before the last frost date in your region (see Resources). Use a spade and breakup the top 6 inches of the soil surface. Mix in 4 inches of aged compost and follow with an all-purpose fertilizer. The university recommends applying 3 cups of 16-16-8 fertilizer for every 50 square feet of garden soil.
Sow the mustard seeds. Bury each seed 1/2 inch below the soil surface and space them apart by 2 inches, according to the University of Arkansas. If you're growing more than one row of mustard, separate each row by approximately 1 foot.
Water the seeded mustard twice daily or as required to keep the surface of the dirt moist. The seeds will typically germinate within 14 days.