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How Often Should I Water My Marijuana Plants?


Dried out marijuana plants and roots are always a bad thing. If they dry out, the plant wilts. When the plants are nestled in soil or other planting mix, the marijuana plants should be watered when the medium seems to be losing moisture. If youwater my marijuana plants to prevent wilting wait for it to dry out completely before watering, you’ll deprive the plant of valuable water it might have used in the growth process, even if it does not look like it will be wilting.

The amount of water and frequency of watering depend on a number of factors including the size of the marijuana plants, the size of the container, canopy, root level, room temperature, humidity, and the stage of growth.

-Larger marijuana plants need more water.
-Large containers need to be watered less extensively.
-Hotter temperatures call for more water.
-Higher humidity calls for less frequent watering.
-During the end stages of flowering, plants will use less water.

During the hot summer days, the soil for outdoor marijuana plants tend to dry out rather quickly and, thus, should be observed and watered as needed. Compost and water-holding crystals can help the soil hold water for extended periods of time.

If the soil is covered with some kind of mulch, the water will be evaporated at a much decreased rate. Wood chips, compost, hay, dried leaves, newspapers, and even rugs will be effective. Want to know more about growing marijuana? Get a free guide about growing marijuana at this link here.

Drowning roots

Symptoms: You’ll see no discoloration. The leaves will droop (but won’t be wilted) with an unhealthy and fatigued aesthetic. Growth will slow to a crawl (if even that).

The Problem: Marijuana plants that suffer from over-watering will develop an anaerobic condition (i.e. a condition in which oxygen is absent). Roots cannot use carbon dioxide, but they need oxygen. That oxygen generally comes from the air pockets between soil particles. When the roots don’t have an adequate oxygen supply, they cannot function right and will eventually lose their potency. Because of this, roots are much more susceptible to pathogens.

There are three possible causes of drowning roots indoors.

-You are watering too frequently and the planting mix cannot drain properly.
-The drainage holes are either nonexistent or clogged.
-The particles in the soil or planting mix are too small and are not allowing water to pass through. (To test this, water the mix. After saturation, the water should drain out freely. Mixes that drain slowly have textures that are far too tight).

Solutions: Ensure that the container has viable drainage holes. If it doesn’t, just cut some into the bottom of the container with a knife, drill, or thermal tool.

If the particles in the planting mix are too fine, then just water your plants less frequently. Coarser, more aerated planting mixes should be used if you are transplanting the current plant or considering new options for the future.

Outdoor problems

Soils that are saturated with clay and/or rain will generally cause poor drainage. By contrast, sandy soils might drain too well. Get a free guide about growing marijuana at this link here.

Under-watering: Wilted plants

Symptom: Plants grow slowly and are wilting.

Solution: This one’s easy: just water the plants. If they are wilted, don’t use fertilizer-enriched water as this can cause more problems. Instead, use un-enriched, but pH-adjusted water. After the plants have regained their upright stature, you can then restart the fertilizer program.

If the quantity of water is barely enough to maintain the plants, growth will obviously slow down. But, this might be hard to recognize at first. The plants will experience a growth spurt as they start to receive more generous supplies of water in concert with an already adequate nutrient value.

Water Temperature

Problem: At what temperature should I keep my hydroponic water?

Solution: In gardens with canopies that have normal temperatures (78*F or 24*C), you should maintain a water temperature of about 72 to 74*F (22-23*C). If the temperature of the canopy is higher, then you should decrease the water temperature by a few degrees.

If you want to start growing, download my free grow guide and order some marijuana seeds. All top quality marijuana seeds are available in my marijuana seed shop. We ship seeds to the US, CA and many other countries. For any growing related question please visit the marijuana support page.



About Author

Robert Bergman is a master marijuana grower. Robert Bergman is the author of 'Marijuana Plant Care' and 'The Marijuana Grow Bible'.


  1. Have a two week old sapling. Found a seed in some dank hydro, decided to grow. It’s pretty active so far. Middle leaves just now pointing out. Deciding to water or not is hardest. Not much sun, either. But it’s growing. How long till i see full leaves?

  2. well my plants weren’t draining well either and seemed heavy after 3 to 4 days. after doin some recon I found I had some clay mixed in with my coco and that slowed down the growth real tough. I mixed fresh coco, perlite, worm castings and great white…. draining properly now

  3. I have 2 plants in my vegetable garden,I noticed one of my plants the leaves in lower and middle of plant are completely yellow,am I overwatering or underwatering my plants

  4. I had my plant since February n its steam is brown or red looking wat does that mean

  5. Don’t water them again until the soil is dried up and they ask for it, is my advice. Either you are watering way too often, or you have a drainage problem. Check your drainage holes. The containers have to drain, and the roots have to have access to oxygen, or they’ll die.

  6. Dazed and confused on

    I have 2 plants that are 19 days old. Even though I over watered them they are still growing. I haven’t watered them for 4 days now and the soil is still very wet and the pots are heavy. Can you tell me how long it should take the plants to fully recover ? I was going to wait to water til I could see the plants start to pray again. Does that seem right?

  7. If you live in the sunny High Desert Southwest US
    Always check your soil moisture levels before adding water to plants that are wilting. The sun is stronger here with less atmosphere, causing many plants to wilt in the afternoon. Besides a lack of moisture, this will also happen from too much sun. When a plant is “done” processing chlorophyll for the day it will wilt in order to stop the process, and this can happen even with perfectly moist soil. Be careful not to over water to compensate. And do consider planting in a place where there is some shade in the late afternoon instead of full sun for most of the day, or using shade cloth to cut back of the full sun. Hi altitude Southwest gardening is a challenge with plants not used to it.
    My two cents

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