Watering herbs at night

The night is full of mysteries. One of this riddle is ‘to water or not to water’ our herbs at night. It is one of the most actual issues, which exist between plant enthusiasts such as you and me.

And yes, the night is not the best time for watering herbs. There is a lack of sunlight, wet foliage, lower activity and high probability of disease of plants. But there are exceptions! Some herbs are watered only at night or in the late evening.

Let’s consider the most important reasons not watering herbs at night and some exceptions! 

Elementary Botany

What can I remember about Botany from my school? Not so much! For example, Botany is the science of plant life and something else. But my teacher demanded knowing some botanical dogmas. One of them sounds like that: ‘Every plant needs light, optimum temperature, enough water, and a good soil’. There are other factors for the normal existence of the plant such as fertilizers or an environmental factor but we’ll try to consider the most important.


Every organism must get the energy for living. We have this energy from the food we eat. And the plant gets it from the sunlight. It is their ‘food’. Some people use fluorescent light at night or when there is not enough sunlight. But we’ll talk about that next time.


It is also one of the main factors. Both high and low temperatures are dangerous for herbs because they can overheat or dry. The optimum temperature for plants is 25°C (77°F). But optimum isn’t the best! Some of them like sun rays, another one prefer the shadow.


It supports the structure of plants, cools our plants down and provides minerals in all the right places. The ability to properly watered plants is one of the most important skills in taking care of them. When excessive watering of roots, plants can ‘suffocate’. Each plant is special and individual, in principle, as a human, and accordingly, it likes by the different moisture content of the soil.

For example, cacti can be watered once a week, since they are not capricious.

And such garden crops as radish, cucumbers, and tomatoes, cabbage, carrots are very fond of wet soil. It is very important for these cultures to be plentifully watered. Therefore, it is desirable to water them every day, then there will be a good harvest.


Another factor is soil. The soil provides plants with water, oxygen, and nutrients. It is anchorage for herbs, where root systems are normalized. Soil contains water, which cools plants, especially in summer, and carries necessary nutrients into plants. Also, soil isolates roots from sharp temperature fluctuation. This is very important during hot summer or cold winter.

‘Mysterious night’

And now we’ll consider some disadvantages of watering herbs at night. Before that, I want to ask you: ‘Are you afraid of the ‘mysterious’ night?’ Your answer is yes, you are not alone in this wonderful world, because of plants and me too. So, let’s start to discuss ‘the horror’ of the night for plants.


First of all, the water stays on the plant for an extended period t of time because of lack of sunlight. Subsequently, it’s an ideal place for fungi and bacteria. These bacilli may gain a stronger foothold and do a lot of trouble if we have unhealthy plants, like damaged stems or gall. The excessive humidity is especially dangerous in the cold seasons because our plant can freeze and we’ll not save it.


Our soil needs to have a perfect friable texture. If not, then watering at night will provide with waterlogging, because compacted soil obviates water from moving slowly into the topsoil. That’s why water remains on the surface of the soil. Science there is no sunlight to evaporate water, oxygen does not reach to the roots and our plant is dead. Our plants’ stem and crown may also be harmed from bacilli or rot if the water concentrates around each plant base. The plants like the measure in all: water, sunlight or fertilizers. Water needs a moment to seep into the soil. And it is better to water herbs repeatedly in parts. We can avoid waterlogging.

No photosynthesis

Also, my Biology teacher would tell us that the existence of living organisms requires solar energy. And herbs are no exception! Their main functions are the absorption of sunlight and the allocation of oxygen. In short, this process is photosynthesis. As a conclusion, no sun – no photosynthesis – no plant – no life!

Night plant

Now we know watering herbs at night can negatively affect their livelihoods. However, there are some plants that require high humidity and it can be watered at night.

Common knotgrass (Polygonum aviculare)

It is necessary to water these herbs at evening time or at night. Then it absorbs moisture and allocates oxygen, coolness during the daytime. That’s why common knotgrass is a natural air conditioner.


Watering lawn grasses are best in the evening hours and in very hot and dry weather in the morning and in the evening, but not during the hottest daytime.

Also, we can include other herbaceous plants in the list. But they are not so much.


This seems to confirm the idea that the night is not the best time for watering plants. There is only one question: ‘What is the best time to water plants?’  It depends on the kind of plants, the environment, and conditions. After all, early morning is the optimum time for watering herbs. The herbs are able to dry with the sun, breathe during the day and get nutrients. We can do it in the late afternoon or in the early evening. If we didn’t have time to water our herbs before these periods, we need to do it in the breezy weather with wind or use a conditioner with fluorescent light. It allows the plant leaves to dry faster and prevents the spread of fungal diseases and be healthy!

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