July 8, 2026, 11:06 am | Read time: 2 minutes
Saltwater is considered a tried-and-true home remedy for tomatoes: It can promote growth and, according to a study, even improve the taste of the fruit. But can this trick also be applied to cucumbers? myHOMEBOOK gardening expert Franka Kruse-Gering explains how cucumbers react to saltwater and why the method can be problematic for them.
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Should You Water Cucumbers with Saltwater?
Anyone involved in vegetable gardening will sooner or later come across the tip to occasionally water tomatoes with light saltwater or diluted seawater solution. The reason is that tomatoes originally come from drier, salt-tolerant regions. They can handle low salt concentrations in the soil surprisingly well–some studies even show improved flavor through this practice.
But not for cucumbers. Just because a trick works for certain plants doesn’t mean it can automatically be applied to others.
Cucumbers are much more sensitive. They belong to the gourd family and have entirely different soil and nutrient requirements. Salt in the soil means stress for them–it disrupts water absorption and can literally “burn” the roots. Even small amounts can lead to growth disorders, leaf discoloration, and a significantly reduced harvest.
These Home Remedies Can Be Used as Fertilizer for Cucumbers
Cucumbers are heavy feeders and require optimal nutrient supply. Home remedies can be used, but they only help to a limited extent and should not be used as the sole fertilizer.
To support cucumber plants, various home remedies can be used. I recommend nettle manure. It’s natural, and nettles are always accessible. I also like to use coffee grounds. They are always leftover and perfectly complement my cucumber care.