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Does Water Temperature Matter in Indoor Plant Care, and How?

Water temperature holds a pivotal role in nurturing indoor plants. It affects their growth, nutrient absorption, and overall health. Understanding its significance allows you to refine your watering practices for optimal plant growth and vitality.

Today, we’re diving into an intriguing question: Does water temperature really matter when watering your indoor plants? Well, the answer is both yes and no. In this blog post, I’ll explain why water temperature is important, how it affects your plants, and provide you with practical tips to ensure your plants thrive.

As plant enthusiasts, we often find ourselves heading to the sink, pouring cold tap water into a watering can, and watering our plants without a second thought. But is this practice harmful? Does the temperature of the water we use make a difference to our plants’ health? Let’s find out!

In nature, plants are accustomed to rainwater that matches the ambient temperature of their environment. Most of our beloved indoor tropical plants originate from hot and humid regions where the rainwater is typically warm, not cold or hot. Understanding this natural context helps us better care for our indoor plants.

Throughout this post, I’ll break down the ideal water temperatures for your plants, discuss the effects of using water that’s too hot or too cold, and share some actionable tips to help you maintain the right water temperature for optimal plant health. So, let’s get started and explore the science behind watering your indoor plants!

Table of Contents

Understanding Water Temperature and Plant Health

Let’s face it, how many times have you walked over to the sink, filled your watering can with cold tap water, and then used it to water your plants? I know I’ve done it plenty of times. But does the temperature of the water really matter for your plants? To find out, we need to look at how plants experience water in their natural habitat.

Most of our indoor tropical plants originate from hot and humid regions around the world. In these natural environments, the rainwater is typically warm, matching the ambient air temperature. This means the rainwater isn’t too cold or too hot. Usually, rainwater has a temperature similar to the surrounding air, which helps plants absorb it more efficiently.

The general recommendation is to use water that’s at room temperature. In the USA, room temperature is typically between 68 to 72°F (20 to 22°C). Using room temperature water helps your plants feel more at home, as it mimics the conditions they would experience in their natural environment. This simple step can make a big difference in their overall health and growth.

Did you know?

The optimal water temperature for most indoor plants is between 60-70°F (16 and 21°C).

Effects of Cold and Hot Water on Plants

So, why is it bad to use cold or hot water for your plants

Let’s start with cold water. 

The average temperature of cold tap water in the USA is between  45 to 55°F (7 to 12°C). When you water your plants with cold water, it can shock their root system. This shock can stunt growth, hinder water and nutrient uptake, and even damage the root cells by causing them to chill.

On the other hand, using hot water can also be problematic.

Hot water typically has less oxygen, which is crucial for root health. Reduced oxygen levels can hinder water and nutrient uptake. If the water is too hot, it can even burn or directly damage the roots. However, a slightly cooler or warmer water than room temperature will probably not kill your plants, but consistently using extreme temperatures can be harmful over time.

To keep your plants healthy and thriving, it’s best to avoid shocking their root system with extreme water temperatures. 

Instead, aim to use water that is close to room temperature. This helps maintain optimal conditions for water and nutrient absorption, ensuring your plants grow as robustly as possible.

Quick Tip!

Let your tap water sit in the watering can to reach room temperature before using it.

Finding the Optimal Water Temperature

Is there an optimal water temperature for watering your indoor plants

Yes, there is!

According to scientific research, the ideal water temperature for promoting water and nutrient uptake through plant roots is between 60 to 70°F (16 and 21°C). The sweet spot within this range is around 65°F (18°C). At this temperature, plants can absorb water and nutrients most efficiently, supporting healthy cell function and overall growth.

So, how can you consistently provide this optimal water temperature

Here’s a practical tip: After you’ve watered your plants, refill your watering can and let it sit until the next watering. 

This way, the water will adjust to room temperature, which is usually within the ideal range. This method not only ensures you have the right temperature water ready to go, but it also allows some impurities in tap water to dissipate, making it even better for your plants.

If you prefer to use water directly from the tap, aim for lukewarm water—not icy cold or boiling hot. Adjusting the temperature at the faucet to achieve a comfortable, mild warmth will help prevent shocking your plants’ root systems and support better absorption of water and nutrients.

By taking these small steps to control the water temperature, you’re creating an environment where your plants can thrive. It’s all about making simple adjustments to mimic their natural conditions as closely as possible.

Interesting Fact!

Cold water can shock plant roots, stunting growth and hindering nutrient uptake.

Practical Tips for Maintaining Water Temperature

Maintaining the right water temperature for your plants doesn’t have to be complicated. 

Here are some practical tips to help you keep your water at an optimal temperature:

1. Let Water Sit in the Watering Can: After watering your plants, refill your watering can and let it sit until your next watering session. This allows the water to reach room temperature naturally, ensuring it’s always ready at the ideal temperature.

2. Use a Thermometer: If you want to be precise, consider using a water thermometer. This way, you can check that the water temperature is within the recommended range of 60 to 70°F (16 to 21°C) before watering your plants.

3. Mix Hot and Cold Water: If you’re in a hurry, mix hot and cold tap water to achieve a lukewarm temperature. This method ensures you’re not using water that’s too cold or too hot. Aim for a comfortable, mild warmth that feels just right to the touch.

4. Store Water in a Room with Plants: Keeping your watering can or water storage container in the same room as your plants can help the water adjust to the room’s ambient temperature, making it convenient for you to use at any time.

5. Avoid Extreme Temperatures: Remember, both icy cold and very hot water can harm your plants. Cold water can shock the roots and hinder nutrient uptake, while hot water can reduce oxygen levels and damage root cells. Always aim for room temperature water for the best results.

By following these simple tips, you can ensure that your plants receive the optimal water temperature, promoting healthier growth and more efficient nutrient absorption. Taking a few extra moments to prepare the water can make a significant difference in the well-being of your indoor garden.

Plant Care Tip!

Room temperature water mimics natural rainwater conditions for tropical plants.


In conclusion, the temperature of the water you use for your indoor plants does matter. Using water that is too cold or too hot can shock the root system, hinder growth, and reduce nutrient uptake. The best practice is to use water that is at room temperature, ideally between 60 to 70°F (16 and 21°C), with the sweet spot being around 65°F (18°C ).

Here’s a quick recap of the key points:

  • Room Temperature Water: Mimics natural rainwater conditions and supports optimal plant health.
  • Cold Water Effects: Can shock the roots, stunt growth, and hinder nutrient uptake.
  • Hot Water Effects: Has less oxygen, can damage roots, and reduce nutrient absorption.
  • Practical Tips: Let water sit in the watering can, use a thermometer, mix hot and cold water, store water in the same room as plants, and avoid extreme temperatures.


By following these guidelines, you can create an environment that helps your plants thrive, just as they would in their natural habitat. It’s a small change that can make a big difference in the health and growth of your indoor garden.

Embrace the spirit of horticulture and spread the seeds of wisdom

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