EC and pH Chart For Hydroponic Vegetables & Herbs
EC and pH requirements for popular home grown vegetables and herbs.
| Plant | EC (mS/cm) | pH | Planting | Harvest |
|---|---|---|---|---|
| Arugula | 1.2 – 1.8 | 6.0 – 7.0 | Spring, Fall | Spring, Fall |
| Artichoke | 1.8 – 2.8 | 6.5 – 7.5 | Spring, Fall | Summer, Fall |
| Asparagus | 1.4 – 1.8 | 6.0 – 6.8 | Spring | Summer |
| Basil | 1.0 – 1.6 | 5.5 – 6.5 | Spring, Summer | Summer, Fall |
| Beets | 1.8 – 4.0 | 6.0 – 6.5 | Spring, Fall | Summer, Fall |
| Bell Pepper | 1.8 – 2.8 | 5.5 – 6.5 | Spring | Summer, Fall |
| Bok Choy | 1.5 – 2.0 | 6.0 – 7.0 | Spring, Fall | Spring, Fall |
| Broccoli | 2.8 – 3.5 | 6.0 – 6.5 | Spring, Fall | Summer, Fall |
| Brussels Sprouts | 2.0 – 3.5 | 6.0 – 6.5 | Spring, Fall | Fall, Winter |
| Butterhead Lettuce | 0.8 – 1.2 | 5.5 – 6.0 | Spring, Fall | Spring, Fall |
| Cabbage | 1.5 – 2.0 | 6.5 – 7.0 | Spring, Fall | Summer, Fall |
| Carrots | 1.6 – 2.4 | 6.3 – 6.7 | Spring, Fall | Summer, Fall |
| Cauliflower | 1.5 – 2.0 | 6.0 – 7.0 | Spring, Fall | Summer, Fall |
| Celery | 1.8 – 2.4 | 6.0 – 7.0 | Spring | Fall |
| Chard (Swiss Chard) | 1.8 – 2.5 | 6.0 – 7.0 | Spring, Fall | Summer, Fall |
| Chilli | 1.8 – 2.8 | 5.5 – 6.5 | Spring, Summer | Summer, Fall |
| Choy Sum | 1.5 – 2.5 | 5.5 – 6.5 | Spring, Summer | Summer, Fall |
| Chives | 1.2 – 1.8 | 6.0 – 6.5 | Spring, Summer | Summer, Fall |
| Cilantro/Coriander | 1.2 – 1.8 | 5.5 – 6.7 | Spring, Fall | Spring, Fall |
| Collard Greens | 1.5 – 2.5 | 6.5 – 7.5 | Spring, Fall | Fall, Winter |
| Cucumber | 1.7 – 2.5 | 5.8 – 6.0 | Spring | Summer |
| Dill | 0.8 – 1.4 | 5.5 – 6.5 | Spring, Summer | Summer, Fall |
| Eggplant | 2.5 – 3.5 | 5.5 – 6.0 | Spring | Summer, Fall |
| Endive | 0.8 – 1.8 | 5.5 – 6.0 | Spring, Fall | Summer, Fall |
| Escarole | 1.8 – 2.2 | 5.5 – 6.0 | Spring, Fall | Summer, Fall |
| Fennel | 1.4 – 1.8 | 6.0 – 6.7 | Spring, Fall | Summer, Fall |
| Garlic | 1.4 – 1.8 | 6.0 – 6.5 | Fall | Summer |
| Ginger | 1.6 – 2.2 | 5.5 – 6.5 | Spring | Fall |
| Green Beans | 1.8 – 2.4 | 6.0 – 6.5 | Spring | Summer |
| Horseradish | 1.6 – 2.2 | 5.5 – 6.5 | Spring | Fall |
| Kale | 1.5 – 2.5 | 6.0 – 7.5 | Spring, Fall | Summer, Fall |
| Kohlrabi | 1.5 – 2.5 | 6.0 – 7.0 | Spring, Fall | Summer, Fall |
| Leeks | 1.4 – 1.8 | 6.0 – 6.5 | Spring, Fall | Summer, Fall |
| Lettuce | 0.8 – 1.2 | 5.5 – 6.0 | Spring, Fall | Spring, Fall |
| Mint | 1.2 – 1.8 | 5.5 – 6.0 | Spring, Summer | Summer, Fall |
| Mustard Greens | 1.5 – 2.5 | 6.0 – 7.5 | Spring, Fall | Fall, Winter |
| Nasturtium | 1.2 – 1.8 | 6.1 – 6.6 | Spring | Summer |
| Okra | 2.0 – 2.4 | 6.0 – 6.5 | Spring | Summer, Fall |
| Onions | 1.4 – 2.0 | 6.0 – 7.0 | Spring, Fall | Summer, Fall |
| Oregano | 0.8 – 1.2 | 6.0 – 8.0 | Spring | Summer |
| Parsley | 0.8 – 1.8 | 5.5 – 6.0 | Spring, Fall | Summer, Fall |
| Peas | 1.5 – 1.8 | 5.8 – 6.3 | Spring | Summer |
| Peppers | 1.8 – 2.8 | 5.5 – 6.0 | Spring | Summer, Fall |
| Potatoes | 2.0 – 2.5 | 5.5 – 6.0 | Spring, Fall | Summer, Fall |
| Pumpkins | 1.8 – 2.4 | 5.5 – 6.5 | Spring | Fall |
| Radicchio | 1.8 – 2.0 | 5.5 – 6.5 | Spring, Fall | Summer, Fall |
| Radishes | 1.6 – 2.2 | 6.0 – 7.0 | Spring, Fall | Spring, Fall |
| Rhubarb | 1.2 – 2.0 | 5.5 – 6.5 | Spring | Summer |
| Rosemary | 1.0 – 1.6 | 5.5 – 6.0 | Spring, Summer | Summer, Fall |
| Rutabaga | 1.8 – 2.4 | 5.5 – 6.5 | Spring, Fall | Summer, Fall |
| Sage | 1.0 – 1.6 | 5.5 – 6.5 | Spring, Summer | Summer, Fall |
| Spinach | 1.8 – 2.3 | 6.0 – 7.0 | Spring, Fall | Spring, Fall |
| Squash | 1.8 – 2.4 | 5.5 – 6.5 | Spring | Summer |
| Strawberry | 1.2 – 1.5 | 5.5 – 6.5 | Spring | Summer |
| Sweet Corn | 1.6 – 2.4 | 6.0 – 6.5 | Spring | Summer |
| Swiss Chard | 1.8 – 2.5 | 6.0 – 7.0 | Spring, Fall | Summer, Fall |
| Tatsoi | 1.5 – 2.5 | 5.5 – 6.5 | Spring, Summer | Summer, Fall |
| Thyme | 0.8 – 1.6 | 5.5 – 7.0 | Spring | Summer |
| Tomatoes | 2.0 – 5.0 | 5.5 – 6.5 | Spring | Summer, Fall |
| Turnip Greens | 1.8 – 2.0 | 6.0 – 7.5 | Spring, Fall | Spring, Fall |
| Turnips | 1.6 – 2.0 | 6.0 – 7.5 | Spring, Fall | Spring, Fall |
| Watercress | 0.5 – 1.5 | 6.5 – 6.8 | Spring, Fall | Spring, Fall |
| Zucchini | 1.8 – 2.4 | 6.0 – 6.5 | Spring | Summer |
*for reference only. Adjustments may be required depending on your local condition and water hardness.