Hot or Cold Water: Which is Better for Plant Growth?

What happens to plants when they are exposed to cold water? Is it good or bad for them? Plants require certain temperatures to thrive. Too much heat or too little can cause stress and even death. Regarding watering, some experts say that hot water is better than cold water. Others disagree.

In this article, we'll explain why and which water s safe to use in order to have a healthy life.

First of all, let's get to know cold water:

Is cold water damage the plant? Does it have any benefits or not? Let's dig in to find out-.

The controversy surrounding the use of cold water on plants

Using cold water on plants may not kill them but can cause them to go dormant. Using cold water on plants can induce root shock, resulting in long-term root harm, leaf droop, and even plant death. In most cases, using ice cubes on plants is a hassle and could damage certain indoor plants.

If you water your plants with cold water, they may go into a state of "winter mode." They won't necessarily die, but they will slow down either in their growth or Blooming. Generally, flowering plants should not be exposed to cold water.

Benefits of cold water?

The truth is there is no benefit to using cold water in the plants. They will slowly kill your beloved plants. So, if you want to give your plants a healthy life, then avoid cold water. But there are also a few ways to get the best out of cold water.

Use ice cube

If you are so intending to use cold water, then use an ice cube. This works to water your plant slowly, reducing the chance of slow kill ''over watering'' but its method isn't also proven 100% healthy. Still, it hasn't had a bad report, so it won't hurt to try this method. here are some benefits of using ice cubes-

1. Prevents Overwatering

Overwatering a plant is not always about how much water it receives at one time: it's also about how often you water it. While there may be some truth to that, it's important to note that overwatering isn't always about how much water it receives at once.

Orchids, for example, require infrequent watering, but they benefit from thorough irrigation. You will overwater if you do this too frequently.

Excess water should drain away from the saucer if the soil drains well and the pot has drainage holes. Once the top soil has dried out, the next watering should take place.

Generally, the instructions I've seen for watering orchids with ice cubes recommend only using two to three ice cubes per week. It is obvious that using fewer ice cubes will prevent overwatering, but it may also provide too little water.

2. Convenience

I find it easier to water plants by throwing ice cubes on the soil rather than using the traditional method of watering. Ice cubes can be used to water plants, but you must make ice cubes before using them. I like it better than the traditional saucer - water doesn't pool at the bottom of the pot, and you don't have to empty it.

3. Kills Bacteria

The idea that freezing water kills bacteria is a common misconception. Therefore, ice cube watering does not constitute a compelling reason to use them over regular watering based on this purported benefit.

4. Prevents Leaks

Unless you're watering the plants in a tub or outside, watering plants in hanging baskets does come with unexpected leaks. In order to prevent water from draining through the holes in the bottom of the basket, ice cubes seem to provide a better watering experience and convenience.

In contrast to ice cube plant watering, those plants tolerate deep and thorough waterings that are done periodically with no the apparent increase in contact time.

5. Promotes Blooming

The temperature difference is another benefit of using ice cubes to water houseplants - especially orchids - because it promotes blooming. At the root level, it is not advisable to recreate the difference in temperature between night and day that orchids need in order to bloom.

Ice-cold water harms orchids, let alone temperatures below 60 degrees Fahrenheit. There is a possibility that the plant could suffer from thermal shock as a result of this drop in temperature. It is even possible to slow the growth of orchids or put them into a dormant state.

Now let's talk hot water:

Benefits of Hot Water and Plant Growth-

The use of hot water for plant care is one of those things that sounds like complete nonsense but turns out to work surprisingly well. We've all seen people spray water on plants and think, "that must be doing some damage," but the truth is that water isn't harmful to plants most of the time. In fact, many times, watering plants just encourages disease.

Therefore, boiling water can effectively kill and control weeds and unwanted plants. When it comes to killing the weeds in sidewalk cracks, paver spaces, and even in the garden, boiling water is an effective method. You can control weeds organically by keeping the boiling water away from the desirable plants as long as you keep it from them.

In fact, if you boil water, it becomes super acidic. This makes it much less likely to cause harm to plants. If you want to ensure thatyour plants get enough nutrients, it's best to give them a good soak once every month or two.

We should note the effects of hot water on plant growth before we get started with all this hocus-pocus. No doubt adding too much hot water to plants will kill them. Nothing magical about moving carrots outdoors makes them cook differently than they do in the kitchen.

Method of using hot water bath on plants-

To eradicate pest infestations, hot water is used in two ways: in a bath or in a shower. Hot Water Bath Technique – A bucket of 120°F hot water can be used to immerse your plant pot for one to ten minutes. Aphids, scale insects, mealybugs, and mites can be controlled effectively with this method and other types of pests.

It is important to remember that the root ball of your potted plants should not be hotter than 115°F; otherwise, they may suffer. Hot Shower Technique – Give your potted plants a one-minute cold rinse after spraying them with boiling water at 120°F for five minutes to prevent them from getting damaged by heat. Three times should be repeated to complete the process. Using this method, you can effectively eliminate any nymphs or crawlers you encounter.

Heat Treating Plants

Heat-treating plants is an age-old way of dealing with a wide variety of soil-borne pests, including aphids, scale, mealy bugs, and mites. In addition, many bacterial & fungal pathogens are destroyed in seeds left in water heated up to the same temperatures required to kill pests.

That magic temperature is about 122F (50C) or 120F (48C) for seed disinfecting. You can't just go around putting hot water on plants, willie-nilly. Some plants can't tolerate hot water on their leaves and aboveground parts, so always be sure to apply the water directly into the root zone.

When it comes to insect pests, it's best to submerge the whole pot in another pot full of 120F (50C) water and keep it there until your probe thermometer indicates the rootball has reached 115F (46C).

Plants and boiling water: dangers

Warm water benefits plant growth, but boiling water over 120 degrees Fahrenheit can be more harmful than useful. Boiling water damages the structural integrity of plant tissue, causing it to become brittle and breakable. This makes it difficult for roots to penetrate the soil, making it hard for plants to grow properly.

If you touch the leaves of a plant while heating water, they will melt their protective wax coating, allowing bacteria to enter the leaf pores and cause infection. On top of that, it could kill off certain types of microbes in your potting mix, including those necessary for healthy growth. A study published in HortScience found that boiling water causes up to 90% loss of total microbial biomass within 24 hours.

Which is the best temperature for plants?

Room temperature water or tepid water is the best temperature for plants. Watering plants when very hot outside is allowed as long as the water temperature is in a more tepid range.

Watering plants during the day's heat leads to more water evaporation before reaching the plant's roots. So, the perfect temperature for plants is room temperature.

Frequently asked questions

The best time to water plants?

Watering plants with cold water is best done in the morning. The cooler water temperature will help reduce evaporation, giving the plant time to absorb the water before the heat of the day sets in.

Watering plants with cold water is not advisable during the midday hours, as the sun will cause the water to evaporate before the plant can absorb it. It is okay to water plants in the early evening, but only in warmer weather. Watering plants in the evening can lead to leaf drops and fungal diseases in cooler weather.

The best way to store plants

To store plants, it is best to keep them in a cool, dark place. The ideal temperature for storing plants is between 50 and 60 degrees Fahrenheit.

It is also important to store plants in room temperature or in tepid water. Hot water can damage the roots of plants, and cold water can shock them.

Finally, it is best to avoid watering plants during the heat of the day. Watering plants in the middle of the day can cause the water to evaporate before it has a chance to reach the roots of the plant.

3. Which plant can deal with every temperature?

No single plant can deal with every temperature. Different plants are adapted to different temperature ranges and environmental conditions. For instance, some plants thrive at higher temperatures, while others need cooler temperatures to survive.

4. What is the best temperature for healthy roots?

The best temperature for healthy roots is between 60-70 degrees Fahrenheit during the day and between 50-60 degrees Fahrenheit at night. Changing the temperature too drastically or not allowing enough variation between the warm and cold periods can create stress for the roots. Limiting temperature fluctuations and keeping the plant in the mentioned temperature range is best.

5. What is the ideal temperature?

Ideal temperatures for healthy plants will vary depending on the species. Some plants may require a warmer or cooler environment than others. For instance, some succulents and cacti prefer warmer temperatures, while others may need cooler temperatures to survive. Most plants generally prefer daytime temperatures between 65-75°F and nighttime temperatures between 55-64°F. Taking into account each plant’s individual needs will help to ensure it thrives and grows.


Different species of plant have their level of tolerance. But it's better to be on the safe side and use room temperature. Cold or hot water? These arguments will go on because they have some advantages and disadvantages. Don't take any risks; be on the safe side with your beloved plants.


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