Buy Quality Marijuana seeds at Amsterdam Seed Supply – How often should you water Marijuana Seeds? – ✓ High Quality Strains✓ Award winning genetics How much water does a weed plant need and how often should I water my weed plant? Curious? Find all the answers here! Check it out! Learn the art of watering weed plants, how to avoid watering problems, how watering weed properly produces strong, healthy cannabis plants.
How Often Should You Water Marijuana Seeds?
After the hassle of choosing a seed and getting it to sprout then grow, another of the big questions is how often should you water marijuana seeds until they germinate. You should not water marijuana seeds once you place them to germinate in a warm moist place. If you give your marijuana seeds water very often you will drown the seedling and it won’t be able to crack out of its seed.
Now that the Marijuana seed has germinated, how often should you water Marijuana seeds?
Once it germinates though, how often you should water marijuana seedlings varies according to the temperature of where the marijuana seeds are growing, but as a rule of thumb, you should water the marijuana plant once the soil is dry. An easy way to tell is if you try and lift the edge of the pot with one finger; if it feels “light” then it’s time to water, if not then leave it a few more days to evaporate and check back often to water. Usually, when you follow this technique, it helps with the formation of trichomes on your marijuana plants during the flowering phase which is equal to dank-er flowers.
You might also find our FAQ submission How Do I Feed A Plant? useful!
How Often Should I Water My Weed Plant?
How much water do weed plants need and how often should I water my weed plant? These are questions we receive quite often from novice growers. Time to write a blog about it!
Whether you grow weed plants in soil or some other medium such as coconut coir, watering is an important consideration that is vital to the success of your crop. Cannabis plants cannot survive without water, but when the compost is too wet, oxygen cannot get to the roots, which causes them to choke.
How much and how often do I have to water my cannabis plant?
How often and how much water you have to give to your cannabis plant is usually hard to describe. It isn’t an exact science. Autoflower strains generally need less water and can handle a mistake in watering more easily compared to feminized strains.
Yet, whatever the strain you grow, if you do not give enough water to a weed plant, it will start to sag and the growth or flowering will slowly stop. It is, therefore, important that your weed plant receives sufficient water and regularly. If you always wait until the leaves hang limp before giving water, the plan will experience stress, resulting in delays in the development of the weed plant. How often and how much water you have to give to your cannabis plant depends on several factors:
The size of the pot
The pot size ultimately determines how often you have to water your weed plant. A large pot with soil dries out much less quickly than a smaller pot with soil, so you will have to water more often to prevent dehydration. It is important that you regularly feel the earth to see if it is damp enough. Using a small pot means that the earth in the pot will heat up much faster, which will cause your earth to dry out extremely quickly. It can dry out so quickly that your pot will be completely dry after 12 hours.
Temperature in the grow room
The higher the temperature in your grow room, the faster moisture will evaporate and consequently the moisture in the soil. Since a weed plant likes higher temperatures, there is a good chance that it will be warm in the grow room. Most of the heat from the grow room comes from an HPS lamp. The higher the wattage of an HPS lamp, the more heat it emits.
When to water your weed plant?
When do you know if you need to water a cannabis plant? There is a good way to do this and that is with your hands. Earth must contain moisture, completely dry earth that is almost loose is not good. It is also not good if your pot of soil is a mud bath. Make sure you have a good middle ground, feel the earth and, if necessary, put your finger into the earth. This way you can easily estimate how dry the soil is and whether it is time to water your weed plant.
When the top layer of soil has become dry, the soil is no longer able to absorb water easily. This is easy to spot as the water runs out of the bottom of the pot almost as soon as you pour it in. When your pots are each on a separate dish, it doesn’t make a difference as the soil will absorb the water from the bottom.
However, when your plants are placed in a drip tray, it causes a problem because the water invariably runs to the lowest point and the plants that are there, absorb all the water from the other plants. This means that some plants receive hardly any water and others get too much. Growers often do not notice this straightway, which can lead to serious issues with the plants.
One way of preventing this is to either provide a separate dish for each plant, water in gradual stages or use a drop of liquid detergent. A flux reduces the water’s surface tension so that the earth is able to absorb it more effectively. You can also add a drop of detergent to a bucket of water but only use a tiny amount and not too often as the detergent can harm your delicate weed plants.
It is important to note that there is no general guideline to specify. A cannabis plant has different water needs at different stages and in different circumstances. However, there are some signs that the plant uses to inform you of its needs. Here are three techniques that can be used to ensure your cannabis plants are given just the right amount of water for their needs.
Method 1: Use your finger
If you want to know how much water is left in the tub, simply put your finger in it. This technique has been used for years and couldn’t be simpler. If soil sticks to your finger, it means that there is moisture in your pot. Water and earth make mud, and that sticks! So it’s fine if the top of the earth is dry, but your fingertips still contain bits of moist soil. That means that there is still some water under the dried-out layer. You can also use a skewer instead of your finger, which discolours due to water in the soil. This means that there is less chance of damaging roots.
Growing tip! Give lukewarm water. Let the water from your tap stand for a few hours so that all superfluous substances, such as chlorine, evaporate.
Method 2. Lift the pot regularly
This is one of the best methods but one that has to be done regularly over time. It’s simple: every time you water, you lift the pot. Lift it before and after watering. You will then automatically notice a difference in weight. Extra water makes a heavier pot. After a few weeks of practice, you will increasingly feel the difference. This allows you to perfectly estimate how much water your weed plant needs this time. Experienced growers only have to lift a pot to know how much water they have to give.
Method 3. View the appearance of the leaves
How much water do weed plants need? Your plant is actually able to show you. Do you see the leaves facing the sun? Are the leaves tilting upwards? These are good signs, your plant is happy with its growing conditions. Do you see leaves hanging down and looking droopy? Then there is a strong chance that you have given either too much or too little water. If you have not given enough water, the leaves will be very thin and fragile. If you have given too much water, the leaves are thick. After all, there is a lot of water in the leaf.
Method 4: Use a moisture meter/tensiometer
Insert a moisture meter into the soil and measure the amount of moisture there. This is a rather lazy method and is not always very reliable. Our experience shows that working with a similar instrument only causes long-term difficulties. Anyone can learn how to grow cannabis, including how to ‘manually’ determine how much your plant drinks. You need to know what to do if the meter’s battery runs out. How will you know how much water your weed plants need?
Growing tip! Is there dry and contracted soil in the pot? Does the water run underneath your pot along the edges? First, give half a litre of water so that the earth can expand. Wait for half an hour and then give some more water.
Growing tip! Do you grow with certified organic food and do you add useful fungi to your soil? Then your soil may well stay a little wetter compared to a mineral diet. The fungi and bacteria need moisture to multiply and stay alive. The fungi in the mycorrhiza also retain moisture and need moisture. Of course, you do not want your carefully constructed ‘living soil’ to be destroyed by a drought period. That would be a shame.
Create nutrient water
When preparing nutrient water, you must follow the correct order and give the water the chance to warm up to the right temperature. When the water is significantly colder than the ambient temperature, the cannabis plant suffers a temperature shock. Similarly, water that is too hot can lead to the roots struggling to get enough oxygen. The temperature of the water also affects the pH value.
The best plan is to allow the water enough time to heat up in your grow room until it gets to the right temperature. You could leave it overnight.
How to give the water?
You could use a watering can if you only have a few plants. Watering cans generally work well, but it’s difficult to water a large number of weed plants with a single watering can because you have to keep filling it up. Use a feed that is formulated for tomato plants.
A hosepipe connected to a large container is a good solution as you can add nutrients and ensure it is the correct temperature.
Keep the plants on trays or saucers so that excess water can be removed and the plants are not left in standing water. Trays are more convenient as you can deal with more plants at the same time.
Ensure that the pots or containers have plenty of drainage holes to prevent excess water from remaining and the roots from rotting.
You will need to water your plants more often at the start of the grow and less as they mature. Always check the soil every two or three days at a minimum.
Follow these tips for healthy cannabis plants and a delicious crop of weed!
Watering Weed: A Beginner’s Guide with Kyle Kushman
Learn the art of watering weed plants and you’ll avoid many of the problems that can ruin a good crop. This is especially important for beginners!
The trick is knowing when to water, how much to give, how to avoid drowning your plants or drying them out. It’s not as simple as constant feeding. Over watering weed plants can be just as destructive as letting them dry.
This article will cover all the basics of watering weed, from pot sizes to cycling wet-to-dry, to flushing your plants at the end of flowering. We’ll give you weed watering tips from experts like Kyle Kushman, and we’ll show you how important watering is to growing strong, healthy cannabis plants.
How do you know when to water cannabis plants?
Any watering schedule for weed will depend on the medium, the climate, the strain, and your setup. Some soils drain quicker than others, some lamps are hotter, some plants are thirstier. Every grow is different.
The best way of watering weed plants is to cycle wet to (almost) dry. As the moisture recedes, the roots expand, searching for water. This makes for a healthy, solid root ball and a stronger, sturdier plant.
When the soil is dry to a depth of a few inches (don’t be shy, stick your finger in) it’s time to water again. This is usually around 2 – 3 days after watering, but every grow is unique so DO NOT take this as a hard and fast rule.
Once you have a few indoor grows under your belt, you’ll be able to judge when to water your weed plants by picking up and weighing the container.
We’re often asked about weed and feed watering, but there’s no one-size-fits-all answer. Your nutrients will have a particular feeding schedule to follow, unique to the brand or product. Follow it as best you can.
Are you looking for nutrients? Your Homegrown seeds should be grown with Homegrown nutrients. Our breeders use them, so should you.
Tip: Keep a record when feeding and watering, watch how your plants react, make a note of positive and negative reactions and use this information to make improvements.
Watering weed: how much water do marijuana plants need?
One major aspect of watering weed is knowing exactly how much water to give your plants. Indoors, this mainly depends on the size of the pot and the substrate (type of soil). Watering outdoor weed plants depends more on natural drainage, weather and climate.
Tip: If you’re using water-based nutes, make sure you water enough to get 10 – 20% extra run-off from the bottom of the pots.
Pot size is hugely important when watering weed plants. It can affect the balance between moisture drainage and retention, determining whether your crops go thirsty or drown.
As your plants grow, you’ll move your seedlings from smaller to larger pots. If you can’t progressively transplant like this, you’ll need to take steps to mitigate potential issues.
- Water more frequently in pots that are too small (they’ll dry more quickly).
- For pots that are too large, try to focus the waterings around the central stem, keeping a dry boundary at the outer edges.
For plants in perfect-sized pots, you should saturate fully. Check our article about “autoflower pot size” to know the best fit for autoflowers and water properly.
Many indoor weed gardeners use soil-based media, which makes watering weed an essential skill to master, but not all soil is the same.
Those growing weed in coco coir, for example, may need to use more water than those growing in living soil. Coco is firmer and it can be more difficult for the water to get to the roots.
Indoor growing has advantages over outdoor. You get complete control over the conditions, which makes it easy to provide the ideal light, humidity, and temperature for growing weed.
Why does temperature matter? Warmer conditions will see plants lose moisture more quickly, increasing the frequency of waterings. What you can control indoor, you have to monitor outdoor.
Again, keep records, keep an eye on the weather and be ready to react. Use common sense – it’s unlikely your plants will need watering after a heavy rainfall!
Stage of growth
Watering weed plants that are 2 days old is different to watering huge, fully-flowering weed plants. Fortunately, we have experts on hand to break it all down for you.
Don’t have time to listen? Here’s the basics…
- A light misting several times a day for seedlings.
- A gallon every three to five days for young, vegging plants.
- Two gallons every three to five days for crops in late vegetative growth.
- Slowly reduce the amounts when the flowering stage begins.
Tips on how to water weed plants
- Quality over frequency. Watering weed is best when employing a wet-dry cycle — treat your plants to healthy, less frequent drenching.
- Hit the middle first. Give the root system enough time to drink before hitting the edges.
- Remove the run-off.That murky liquid in the runoff tray is an ideal breeding location for mold and rot.
How to flush weed plants
Flushing cannabis means purging your soil of nutrients, allowing the plants to use up the nutes they’ve already absorbed. This makes for better flavors and aromas in your harvested buds, but can also reverse the effects of over-feeding.
There are two primary reasons for flushing:
1. Nutrient imbalance
An overabundance of nutrients and improper pH levels can stress your marijuana plants. By flushing, you remove the excess buildup and restore the pH balance, promoting healthy growth.
How? You need to repeatedly water the pots with pH-neutral water. Repeat until your pH and PPM levels return to acceptable levels, then resume your normal schedule.
2. Ahead of harvest
Most growers like to perform a final flush before harvest, to improve the quality of the buds, but flushing timeframes differ depending on your growing medium. As a rule, you should flush…
- A week to ten days before harvest for soil.
- A week before harvest for coco coir and rockwool.
- Five days to a week before harvest for hydro.
Tip: Use three times the capacity of your container of pH-adjusted water for soil flushing. In soilless media, all you need to do is change your reservoirs.
Best water for your plants
Watering weed with the correct type of water makes a huge difference to your crop. As well as pH, the amount of dissolved solids in water (measured in parts per million, or ppm) can cause issues you’d much rather avoid.
Tip: Always check the ppm levels of your water, with a particular focus on biological and chemical contaminants.
Unfiltered tap water
Despite some growers’ claims, tap water can be used to grow cannabis, as long as you live in a municipality with good water treatment protocols.
- Affordability. Tap water is CHEAP!
- Ease of access. Taps are handily placed around the home and garden.
- Low-effort. Using tap water is as easy as letting it run and filling your bucket.
- Potential pH imbalance. If the pH is off, tap water can harm your cannabis plants and lead to nutrient lockout.
- Potential ppm issues. Large cities tend to have ‘hard water’ that could cause nutrient toxicity. Always check!
This source is pure, accessible, and guaranteed to be uncontaminated. It’s a great (if costly) solution for small gardens and growers worried about the pH of their tap water.
- Safe. Manufacturers have to abide by sets of standards for their products, which guarantees quality water for your plants.
- Easy. This one is second only to tap water in terms of accessibility.
- Environmentally harmful. Bottled water comes in plastic containers. One growing season ends up producing a lot of waste.
- Cost. The cost of bottled water is far higher than tap.
- PPM. Some bottled waters contain very high mineral levels.
Water collection systems
Eco-friendly cultivators love rainwater and gray water collection systems for watering weed. They work especially well in areas where water-saving is encouraged.
- Environment. There’s no better way to do your part in helping the planet than using rain water.
- Cost. Once you set up the system, watering weed will cost you nothing.
- Low-maintenance. The sustainability aspect also makes these systems easy, letting you reuse water hassle-free.
- Starting capital. Rain barrels and faucets aren’t extortionate, but some purchases are unavoidable and costly.
- Gray water needs filtering. Especially if your toiletries are full of chemicals.
Reverse osmosis systems
RO systems can deliver an almost unlimited clean water supply for watering weed, and they’re loved by expert growers like Kyle Kushman.
- Purity guaranteed. Think bottled water, but on a large scale and much more affordable.
- Suitable for large gardens. You’re limited only by how much you can take from the tap.
- Initial investment. Even the most basic systems can be costly.
- Not eco-friendly. ROs can lead to unnecessary waste.
Common watering issues: signs and solutions
Watering issues are easy to solve with a bit of know-how.
Over watering weed plants
Eager newbies have been known to spend every last minute watering weed, desperate to keep their plants from drying out. Overwatering weed plants is avoidable! Look out for…
- Drooping, wilting leaves.
- Top foliage yellowing.
- Brown leaf edges.
- Cupping and curling.
Always let the soil (almost) dry before you water again!
Under watering cannabis plants
Underwatering weed is just as avoidable, look out for…
- Papery thin leaves.
- Overall yellowing.
- Limpness and lifelessness.
Regularly check the soil and keep an eye out for adverse effects. Do not let your plants dry out!
The pH levels in organic soil are usually well-balanced and optimized for growth. If you’re using mineral-based nute solutions, or if you’re growing in coco or hydro, you’ll need to be extra vigilant.
- 6.3 – 6.8 for soil.
- 5.5 – 6.1 for coco and hydro.
Signs of bad drainage include:
- Pools on top of the soil.
- Pot stays wet and heavy for far too long.
- Bad smell, signs of over watering.
How can you resolve drainage issues?
- Make sure the drainage holes are clear.
- Add perlite to aerate the soil.
- Water more frequently, using less water per watering.
How to water cannabis plants if you are away?
Watering weed is a commitment that can’t be avoided, even if you’re on the holiday of a lifetime. The best auto watering system for weed can include homemade rigs as well as shop-bought systems. Our favorite solutions include:
- Makeshift bottle drips. Drill holes in a bottle cap and place it in your container, cap-side down.
- Plastic bag greenhouses. Get a large, clear plastic bag and a support structure (plastic polls or bamboo will do). Place it over a soaked pot to form condensation.
- Irrigation systems. Timer-controlled, on-demand systems are a cultivator’s best friend and a fantastic option for those cultivating away from home.
- Smart drip setups. These are a more advanced version of the bottle trick. They have smart timers to make sure your weed is watered and happy at all times
Mastering the basics
This guide for watering weed should have given you the tools and knowledge to know when and how to water your own plants, according to your set up. We mostly focused on soil-based cultivation, but you can visit the Homegrown Forum to find specific advice for hydro and other advanced setups.
Uploading your journal to Homegrown Diaries should deliver some practical assistance, too.
The basics are simple: cycle wet to dry, keep records, observe your plants.
Let us know how it goes.
About the author: Kyle Kushman
13 times Cannabis Cups winner. Kyle Kushman is a master breeder and indoor growing expert, a leading voice in the fight for legalisation and education, especially when it comes to growing cannabis at home. He’s been teaching and spreading the word for over 30 years, maintaining a consistently high level of achievement throughout his entire career.