Yellowing Rocket (Arugula): Causes and Fixes

Rocket (arugula) with yellow leaves usually signals nutrient deficiency or water stress—not disease.

Quick Diagnosis

• Uniform yellowing (older leaves first): Nitrogen deficiency
• Yellow between veins (newer leaves): Iron/magnesium deficiency (high pH soil)
• Yellow + wilting: Over/under-watering
• Yellow + stunted: Root binding (container) or compaction

Fixes

• Feed: Liquid fish emulsion or seaweed every 3 weeks (organic). Half-strength synthetic if used.
• Harvest often: Cut-and-come-again prevents bolting, stimulates growth.
• Water: Consistent moisture. Mulch surface.
• Soil pH: 6.0–6.8. Add sulfur if alkaline.
• Succession sow: Every 2–3 weeks for continuous tender leaves.

Rocket is a cool-season crop. In Georgia heat, grow in partial shade or as fall/spring crop.