Distilled water for chilies

In regions with hard tap water, you should mix it with distilled water. Your chili plants will tolerate this mixture better when watering.

When distilled water is evaporated and collected. In this process the original water is separated from chemicals and minerals. Actually not bad, because a lot of lime, chlorine, sodium, calcium and magnesium can damage chili plants in the long run.

Drinking water from the tap is often too hard in Germany. Depending on the water supplier and the area, the values vary.

Contained lime, magnesium and calcium can accumulate in the soil and make the chillies grow less well. A pH-value of over 7 will hinder food intake via the roots.

If you water with distilled water, you will not have problems with too many salts or harmful chemicals such as chlorine, softeners and hormones.

However, as there are no minerals left in the distillate, regular watering will cause the substrate to be washed out. Important minerals and fertilizers are removed from the substrate and gradually run off.

There are two ways to prevent plants from being undersupplied with distilled water. On the one hand, you can enrich it with liquid fertilizer with important nutrients. Secondly, it can be mixed again with tap water. Thus the respective disadvantages balance each other out.

Water Chillis and Paprika
Water Chillis and Paprika

Mixing irrigation water🌶

With hard water (approx. 25 °dH), you should mix the water from the tap with two parts of distilled water. If the water is about 10 °dH, mix with one part. You can usually find out your water hardness on the website of your water supplier or you can find out your postcode here. This value is also important for the correct dosage of detergents, for example.

Tap water to distilled water🌶

Water hardness Mixing ratio
20 - 30 °dH 1:2
10 - 20 °dH 1:1
8 - 10 °dH 2:1

Exclusive use of distilled water for watering chilli and paprika plants is not recommended.

In the hardware store you can get a five liter canister of distilled water for about 2-3 Euro. This is then demineralized and chemically pure. This results in costs of about 3 Euro or Dollar for ten litres of watering water. For a small chili farm in the house this is quite an acceptable price. Alternatively you can also use water from a reverse osmosis plant. Depending on how much water your chilies need.

Too hard water with a high salt content weakens the root of your plant. Poor growth and poor harvest are the consequences. Weakened plants become more susceptible to diseases.

Besides a mixture of tap water with distilled or osmosis water, collected rainwater is best suited for chillies.


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