How to Grow Arugula Hydroponically (From Seed to Harvest)
Home > Hydroponics > How to Grow Arugula Hydroponically (From Seed to Harvest) Last Reviewed: August 2026 | Author: Wara Danish, MSc Plant Biology | Fact-Checked: Horticultural & Glucosinolate Accuracy Verified | Expert Reviewer: Faisal Habib, CEA Hydroponic Consultant Difficulty: Beginner | Seed-to-Harvest: 21–28 Days | Estimated Cost: Under $20 (DIY DWC / Kratky) ⚡ Quick Answer: Hydroponic arugula reaches baby-leaf harvest in 21 to 28 days from seed in DWC, NFT, or Kratky systems. Maintain reservoir pH at 5.8–6.3, EC at 1.2–1.6 mS/cm (600–800 PPM), and water temperature between 60°F and 65°F to prevent premature bolting and harsh bitterness. Multi-seed 5–7 seeds per Rockwool plug for dense cut-and-come-again clusters…