this post was submitted on 29 Mar 2025

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Is hot/warm water better for plants? (dubvee.org)

submitted 1 week ago by [email protected] to c/[email protected]

3 comments fedilink hide all child comments

When I have to run the hot water before starting the dishwasher I usually catch it in a pitcher and use it to water the plants and that got me wondering.

Not because of the temperature but because the hot water has more dissolved minerals in it (yes I am aware this means my tank probably needs flushed; it's on the better half's honey-do list).

I guess now I am curious if water closer to room temperature is better for them too since it would be less of a shock.

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[–] [email protected] 2 points 4 days ago (1 children)

There are very few plants that would see any measurable benefit from the dissolved minerals in tap water. Dissolved minerals are actually to some plants' detriment, because they tend to make water more alkaline. House plants are often tropical plants that evolved in humid, rainy areas with acidic soils. Watering with rainwater or distilled water and using an appropriate fertilizer are almost always going to yield a better outcome.

Temperature-wise, room temperature is best. Plants don't expect or like hot water

[–] [email protected] 1 points 4 days ago

Good to know. Thanks!

Mostly just trying to not waste the water when running it to preheat it for the dishwasher since it takes a while because it's on the far end of the house from the hot water tank. Guess I could just dump it in the rain barrel which should dilute it.