Mustard plants produce large green leaves that are often used to spice up salads. Small brown seeds also come from these plants and are used to make the popular mustard condiment. If you like eating salads or want to try making your own condiment, then mustard is the perfect plant to grow. They can be successfully grown almost anywhere in the United States. Mustard grows best in cool conditions, so you can even plant it right after the harvest of summer plants.
Choose a spot in your garden that has full sun. The planting site should also be at least 4 feet away from other plants because mustard branches out and overtakes any other plants nearby.
Remove all weeds and rocks from the planting site. Too much clutter can prevent the plants from growing.
Dig a 1 foot long trench 1/3 inch deep with a garden shovel. Plant each seed 3 inches apart to provide adequate room. If you want to plant more than one row of mustard seeds, space each row 1 foot apart.
Cover the seeds with soil and add enough water to make the soil moist.
Water the soil regularly throughout its growth cycle to ensure the soil stays moist at all times.
Harvest the leaves when they are 3 to 4 inches long and still crisp. Simply cut the leaves off at the base of the stem to harvest them.