This expanded Crop-Specific pH Cheat Sheet outlines the ideal pH ranges for 20 widely grown hydroponic crops, including leafy greens, fruiting plants, herbs, and root vegetables. Use it as a quick reference to maintain proper nutrient uptake, avoid pH-related deficiencies or toxicities, and optimize overall plant health and productivity.
🌱 Crop-Specific Hydroponic pH Cheat Sheet (Top 20 Crops)
| Crop | Ideal pH Range | Sweet Spot | Notes |
| 🍅 Tomatoes | 5.5 – 6.5 | 5.8 – 6.2 | Needs stable pH for fruiting |
| 🥬 Lettuce | 5.5 – 6.5 | 5.5 – 6.0 | Prefers slightly lower pH |
| 🌿 Basil | 5.5 – 6.5 | 5.8 – 6.2 | Sensitive to swings |
| 🥒 Cucumbers | 5.5 – 6.0 | 5.5 – 5.8 | Lower pH improves uptake |
| 🌶️ Peppers | 5.5 – 6.5 | 6.0 – 6.3 | Slightly higher for fruiting |
| 🍓 Strawberries | 5.5 – 6.5 | 5.8 – 6.2 | Watch iron levels |
| 🥬 Spinach | 5.5 – 6.5 | 6.0 – 6.5 | Likes slightly higher pH |
| 🥬 Kale | 5.5 – 6.5 | 6.0 – 6.5 | Hardy, tolerant |
| 🥦 Broccoli | 5.5 – 6.5 | 6.0 – 6.5 | Needs calcium stability |
| 🥬 Arugula | 5.5 – 6.5 | 6.0 – 6.5 | Fast-growing leafy crop |
| 🧅 Green Onions | 5.5 – 6.5 | 6.0 – 6.5 | Very forgiving |
| 🥕 Carrots | 5.5 – 6.5 | 6.0 – 6.5 | Root crops need balance |
| 🥔 Potatoes | 5.0 – 6.0 | 5.5 – 6.0 | Slightly lower preferred |
| 🌽 Corn | 5.5 – 6.5 | 5.8 – 6.2 | Heavy feeder |
| 🫘 Beans | 5.5 – 6.5 | 6.0 – 6.5 | Sensitive to low pH |
| 🟣 Eggplant | 5.5 – 6.5 | 5.8 – 6.2 | Similar to tomatoes |
| 🥒 Zucchini | 5.5 – 6.5 | 6.0 – 6.5 | Needs consistent nutrients |
| 🌿 Mint | 5.5 – 6.5 | 5.5 – 6.0 | Very adaptable |
| 🌿 Cilantro | 6.0 – 6.7 | 6.2 – 6.5 | Prefers slightly higher pH |
| 🌿 Parsley | 5.5 – 6.5 | 6.0 – 6.5 | Slow starter |
🎯 Quick Grower Insights
- Leafy greens → thrive at 5.5–6.0
- Fruiting crops → prefer 5.8–6.3
- Herbs → flexible but stable pH is key
- Root crops → lean toward ~6.0–6.5