How to grow Basil hydroponically
Ocimum basilicum reaches harvest in 60–90 days in a hydroponic system, with a preferred pH of 5.5–6. This guide compiles the operating parameters published by university extension sources for this crop.
Target pH
Maintain reservoir pH at 5.5–6. pH controls how readily the roots can absorb each nutrient; outside this window the plant shows symptoms of deficiency even when the nutrients are physically present in solution.
Measure with a calibrated pH meter at the same time each day and log the reading. Drift of more than 0.3 units over 24 hours usually signals a reservoir change or a nutrient imbalance.
Nutrient schedule
Targets in ppm for the elemental nutrients most commonly tracked in home hydroponics. EC is shown per stage where the cited source publishes it; absence of a stage EC is intentional and not a data gap.
| Stage | N (ppm) | P (ppm) | K (ppm) |
|---|---|---|---|
| seedling | 210 | 31 | 235 |
| vegetative | 210 | 31 | 235 |
Compatible systems
Hydroponic methods that have been documented as workable for this crop in the cited literature.
- Deep Water Culture (DWC)
Common problems
- sudden wilt, yellow leaves, and brown stem streaks once plants are several inches tall
- Likely cause: seed borne fusarium wilt plugging xylem. Fix: start with pathogen tested or resistant seed, pull infected plants, and sanitize hydroponic equipment between crops.
- interveinal yellowing on young leaves while older leaves stay green
- Likely cause: iron unavailable because nutrient solution pH is too high. Fix: hold solution pH at 5.5 6.0 and confirm chelated iron is in the recipe.
- uniform yellowing of the oldest leaves and reduced plant size
- Likely cause: nitrogen shortage in the nutrient solution. Fix: restore a complete solution and replace the reservoir rather than topping off indefinitely.
Sources
All numeric parameters on this page are drawn from the following extension and research sources.
- e-GRO Research Update 2016.04 — Symptoms of Common Nutrient Deficiencies in Hydroponic Basil (Mattson & Merrill) (accessed 2026-09-11)
- e-GRO Alert 1.8 — Iron Deficiency of Hydroponic Leafy Greens and Herbs (Mattson) (accessed 2026-09-11)
- e-GRO Alert 1.2 — Basil Fusarium Wilt (Daughtrey & Mattson) (accessed 2026-09-11)
- Purdue Extension HO-189 — Sweet Basil: A Production Guide (accessed 2026-09-11)
- Cornell Garden-Based Learning — Vegetable Varieties for Gardeners (Genovese basil) (accessed 2026-09-11)