Yellow Mustard requires consistent moisture, especially during dry periods and throughout its active growth phase. Water deeply when the top few centimeters of soil feel dry to the touch. Avoid waterlogging, as this can lead to root rot. Established plants are somewhat drought-tolerant but perform best with regular watering.

Pruning for Yellow Mustard is generally straightforward and minimal. If you are harvesting leaves, simply snip the outer leaves as needed, allowing the plant to continue producing new growth from the center. For seed production, no significant pruning is necessary; allow the plant to flower and develop its seed pods naturally. As an annual, the plant completes its life cycle, so deadheading spent flowers is not typically required.

Yellow Mustard is easily propagated from seed. Sow seeds directly into the garden bed in early spring after the last frost, or in late summer for a fall crop. Plant seeds about 1 cm deep and 5-10 cm apart in rows, with rows spaced 30-45 cm apart. Germination typically occurs within 7-14 days under suitable conditions.

As an annual plant typically grown directly in the ground or in large containers, Yellow Mustard does not require repotting. It completes its life cycle within a single growing season. If starting seeds indoors, transplant seedlings to their final outdoor location or larger pots once they have developed a few true leaves and the risk of frost has passed.