All You Have to Know About Weed Watering in Any Climate

How to water marijuana properly? It is a question that brings many cannabis growers upside down. Cannabis is a somewhat confusing plant when it comes to irrigation. While it is true that the plant needs a whole lot of water to grow and stay healthy, a slight overwatering can burn the roots and result in the plant’s death.

Besides, the weed plant requires continuous dry and moist cycles to grow appropriately. In simple words, you can not keep on watering the plant every 30 minutes. Instead, you should water it once and wait for the pot to dry out completely before watering it again. 

For these reasons, you must be cautious while watering your weed plant. To make things easier for you, we are listing out the pro tips on how to water weed plants properly, along with factors that can affect your watering cycles. We also recommend you buy cannabis seeds here to get 100% authentic seeds for the best results. So, let’s get started.

Critical Factors Affecting Weed Plant Irrigation Cycles

These are the factors that can affect the quantity of water required by the weed plant to grow properly.


Climate has a significant impact on weed plant irrigation cycles. According to the traditional approach, a plant growing in a hot environment would need more water to survive.

This statement is only valid when there is no humidity in the atmosphere. If the climate is hot and humid, the plant will absorb most of the needed water from the air and not through its roots. In this case, if you are watering the plant more frequently due to hot weather, you will actually be suffocating the roots as they will not be able to absorb oxygen due to a higher concentration of water in the soil.

The same is true for cold and dry climates as there will be no moisture in the air, the plant will absorb more water through its roots, and therefore, you will be required to water it more frequently. 

Water Temperature

Water temperature is a crucial factor often overlooked in weed plant irrigation processes. It is a factor that directly influences the growth of the weed plant and, therefore, the irrigation cycles of cannabis. New growers often wonder why the plant leaves remain flaccid even after watering. The answer here is simple; hot water loses its ability to hold dissolved oxygen needed by the plant to grow. Besides, warmer water might also kill or suffocate beneficial microorganisms that aid the weed plant with nutrient uptake.

While it is true that cold water holds more oxygen, it can trigger a shock and can therefore stress the sensitive roots and affect nutrient uptake of the plant. Consequently, you must find a balance between hot and cold water to grow your weed plant properly. 

Use of Fertilizers and Nutrients

The use of fertilizer nutrients is another critical component of the weed plant irrigation process. In case you are using liquid nutrients, you must monitor water PH levels as synthetic nutrients can affect these levels. The optimum PH level for the cannabis plant is between 6 and 7. PH levels slightly higher or lower than the standard recommendations can cause nutrient lockout as your plant will not be able to continue its usual nutrient uptake.

Besides, weed plant requires different PH levels at various stages of its life cycle, with the details being the following:

  • Seed Germination: Optimum PH levels for seed germination are 5.9 – 6 to prevent infectious bacteria from growing at an early stage of growth. 
  • Growing Plant: After sprouting, start with PH-6, and work your way up to 6.3 to facilitate the absorption of nitrogen and other elements necessary for this phase. 
  • Flowering Plant: Once you see flowers growing out, increase the first irrigations with PH-6.4 and gradually go up to 6.6 until the final cut.

Pot Sizes

This is a relatively obvious factor as the bigger the pot, the more water it will require to support the plant. The recommended volume of water is around a quarter of the volume of the pot. For instance, if you have a 4L pot, you should provide at least 1L of water for each irrigation.

Plant Size

Plant size can also affect the water cycles. In its early stages (germination and sprouting), the weed plant requires significantly less water. In contrast, in its growth stages, the plant will absorb maximum moisture and, therefore, will require more irrigation. The plant needs the maximum amount of water when it is flowering. Here is a list of weed plant growth stages and the optimum irrigation cycle for each stage:

  • Germinating: After 3 to 6 days
  • Growing: After 2 to 4 days
  • Flowering: After 2 to 3 days

Remember that in the last weeks before pruning, cannabis plants begin to consume less water. At that time, it is advisable to progressively reduce the amount of water for each irrigation. This is also the best way to prevent fungi such as Oidium or Botrytis from growing in the pot. 

Pro Tips to Water Weed Plant Correctly

Here are our pro tips for watering your weed plant correctly for better growth and good quality flowers:

  1. Invest in Gadgets: If you want to grow a weed plant correctly, you will have to invest in gadgets such as a PH meter, hydrometer, and timer, and if you have enough money lying around, you can simply buy an auto watering system to adjust your water cycles easily.
  2. Buy Authentic Seeds: Seeds are of utmost importance if you want to grow a healthy weed plant. If you do not invest in good seeds, you will never have a good plant, no matter how good you water your weed plant. Always go for the tested, hand-picked seeds to get the optimum results. 
  3. Avoid Overwatering: You have to be very clear that the plant would not grow more by watering more. The only thing you would achieve this way is to stop the growth because the root will burn out due to a lack of breathable oxygen. Marijuana is a rainfed plant that needs watering periods between dry and wet seasons, respect these cycles, and your Cannabis plants will be happy.
  4. Avoid Underwatering: Watering too little will also cause growth delays, lower production, damage to the plant, and finally, if the dry period is prolonged too long, it will cause death due to dehydration. So you should constantly water at the right point and when the plant needs it.
  5. Maintain Water Temperature: It is crucial to maintain water temperature and not to use too cold or hot water while rinsing weed plants. Hot water has less oxygen; therefore, the plant will die of oxygen deficiency. Cold water has a higher concentration of dissolved oxygen, but it can stress the root system and ultimately kill the plant. It is always a good idea to use water at room temperature no matter what the climate is like.
  • Water Quality: Water quality is as crucial for weed plants as it is for humans. Always use clean water with optimum PH levels (6 to 7). Tap water works well as it has the required PH levels and naturally occurring nutrients. 

Remember to add calcium and magnesium supplements in case you are using rain or osmosis water to irrigate your weed. Supplements will prevent plants from calcium and magnesium deficiencies that can lead to growth problems.

When to Water Weed Plant? 

The best way to know when to water your weed plant is by weighing the pot before and after irrigation. A waterless pot will weigh less, and therefore, you will know it is time to water the plant. 

Another technique that can be used is to scratch the upper layer of the soil and look for moisture. If there is moisture in the soil, the plant still has enough water to breathe, so you should wait for the soil to dry out completely. Another technique that is often used but isn’t recommended is to insert a stick inside the soil to look for moisture. Even though it is an effective technique, it can damage the roots and can also cause stress to the plant.

Best Time to Water Weed Plant

The best time to water a weed plant is before the sun fully rises, as it will prevent them from heat. However, for better growth, you should water plants an hour before sunset. This way, the plant will be able to soak up the water and use it to grow at night. Do not irrigate your weed plant after sunset or in the dark as the plant would not have enough time to soak up the water, and residue water will result in algae and bacteria.


Here is a quick summary of how to water your weed plant in any climate:

  • Marijuana is a rainfed plant and requires dry and wet irrigation cycles to grow. 
  • The plant will not grow more by watering more.
  • Water temperature and PH levels are crucial for weed plant growth. 
  • The more oxygen in the roots, the better for the plant and beneficial microorganisms. 
  • The roots cannot absorb water without air, so let the pot dry out before watering again. 
  • Irrigate less in excessive humidity, even if the climate is hot.
  • Irrigate more in dry conditions even if the climate is cold. 

Finally, remember that it is imperative to use specific products along with water to fertilize the plants depending on the climate and growing conditions.

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