Posted on by Jason Gibson

Hydroponic feeding guide - Vegetables and Fruit

That time is nearly upon us and gardeners of all skill levels are preparing their gardens for another season. However, getting ahead of the season isn’t as easy. Especially if you are germinating your varieties from seed.

A quick tip for those wanting a booming start with their tomatoes, start them inside! Start them now and when the season begins you’ll be able to transplant your seedling with much better vigor, usually resulting in a monstrous crop.

The pH and EC guides are just that, some plants respond differently. Use a healthy dose of observation and intuition if you believe your plants are being under or over fed.


pH ranges for vegetables and fruits

The pH ranges listed below are the specific to hydroponic growing.

Artichoke 6.2-7.5

Asparagus 5.8-6.8

Bean 5.8-6.5

Beetroot 5.8-6.5

Broad Bean 5.7-6.4

Broccoli 6.0-7.0

Brussel Sprouts 6.0-6.5

Cabbage 6.5-7.2

Capsicum 5.5-6.5

Carrots 5.8-6.5

Cauliflower 6.0-6.8

Celery 5.5-6.5

Corn 5.8-6.5

Cucumber 5.5-6.5

Eggplant 5.6-6.5

Garlic 5.5-6.2

Leek 6.0-7.0

Lettuce 5.7-6.7

Okra 6.5-7.5

Onion 5.6-6.6

Pak Choi 5.5-6.5

Parsnip 5.5-6.2

Pea 5.5-6.5

Potatoes 5.2-6.8

Pumpkin 5.5-7.0

Radish 5.8-6.8

Spinach 5.5-6.5

Silverbeet 5.6-7.2

Tomatoes 5.5-6.5

Turnip 5.5-6.5

Zucchini 6.0-7.0

 pH and EC feeding guide vegetables and fruit

EC ranges for vegetables and fruits

The EC ranges listed below are the specific to hydroponic growing, remember feeding is relative to the size and growth rate of the specific plant, so when a plant is only 5cm in height we would not feed optimum doses etc.

Artichoke 0.8-1.8

Asparagus 1.2-2.0

Bean 1.2-2.4

Beetroot 1.1-2.4

Broad Bean 0.8-2.4

Broccoli 1.2-3.5

Brussel Sprouts 2.4-3.0

Cabbage 1.2-2.8

Capsicum 0.8-2.8

Carrots 1.6-2.2

Cauliflower 1.2-1.8

Celery 0.8-1.6

Corn 1.7-2.5

Cucumber 1.2-2.5

Eggplant 1.2-2.7

Garlic 1.4-1.8

Leek 1.2-1.8

Lettuce 0.8-1.6

Okra 0.8-1.7

Onion 1.4-1.8

Pak Choi 1.5-2.0

Parsnip 1.5-2.0

Pea 1.2-2.4

Potatoes 2.0-2.5

Pumpkin 1.8-2.4

Radish 1.2-1.8

Spinach 1.6-2.4

Silverbeet 1.2-2.2

Tomatoes 1.8-4.2

Turnip 1.1-2.2

Zucchini 1.8-2.4

If you find fluctuations with your pH and EC and can’t understand why;

If pH rises then the plants are only consuming food.

If EC rises then the plants are only drinking water.

Ideally, we need to find the ‘sweet’ spot for feeding as we want our nutrient tank to deplete everything evenly, so the nutrient level should be dropping and the pH and EC numbers will remain the same.