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what to do with an overwatered cannabis seeding

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Examples of highly acidic fluids include battery acid, lemon juice, and vinegar, while highly basic fluids include household ammonia, milk of magnesia, and bleach. Distilled water is neutral with a pH of 7.

You can create a system to collect rainwater or gray water. These systems work very well under the right circumstances and can be both inexpensive and environmentally friendly.

Flushing is an important part of the marijuana growing process, when you stop giving a marijuana plant nutrients and give it straight water. It’s primarily done to flush out any nutrients that may have built up in a plant during its life, and it’s usually done a week or so before you chop the plant down at harvest.

Flushing marijuana plants for nutrient imbalance or lockout

Unfortunately, many jurisdictions have ordinances that either completely prohibit or set strict limits on the collection of rainwater and the reuse of gray water. Proponents of these restrictions argue that there are health and safety concerns.

Water that contains higher quantities of minerals such as calcium or magnesium is called hard water. This type of water has a higher ppm due to the extra dissolved solids in it. Water with less minerals and a lower ppm is called soft water.

Factors to keep in mind when looking at water sourcing options include:

Some cities use incredibly hard water with high levels of contaminants such as chlorine, calcium, and magnesium. While water with a low ppm concentration of these chemicals won’t necessarily kill a plant, it can have a negative impact on the biological activity in organic soil.

Then of course, the dimensions of your container will also affect the overall balance between moisture retention and drainage. If you have a tiny plant in a huge pot, drenching the whole substrate is going to drown the poor thing before it gets a chance to flourish. Similarly, you might experience the opposite issue with huge root-bound plants stuck in minuscule pots. This is also the reason that growers normally start seedlings in smaller pots, then up-pot them later as the plant grows. A small seedling pot makes it much easier not to overwater the sensitive seedling.

Cannabis plants have different watering demands depending on their stage of maturity. The specific guidelines we share below apply to mature vegetating and flowering plants. Seedlings and clones require much less water.

In the early stages, avoid watering your plants with a powerful stream that might knock them over and disturb developing roots. Instead, use a light mister to gently moisten the substrate.



Cannabis plants don’t always grow at the same pace. A plant in a cooler environment, for example, will grow much slower than one under balmier conditions. Light intensity plays another big role here. Plants that receive more heat and light are bound to have higher water and nutrient requirements than those with meagre light and chilly temps.

The type of growing medium you use largely determines how much water the soil can hold, and drainage plays a huge role in how often/how much you water your plants. Cannabis likes rich yet airy and “fluffy” types of soils that are well-draining. As another consideration, the growing containers themselves must have holes punctured in the bottom to allow the water to escape. More compact soil mixes will hold moisture much longer, so they require less frequent watering as a result. Otherwise, moisture can linger in the soil for some time, which can lead to nutrient deficiencies, root rot and fungus, pests, and a whole lot of other problems.

Here is a quick way to check if your water is draining properly: If it takes several minutes for water to drain after drenching the soil, and/or if it takes longer than 3–4 days for your soil to dry out, it’s likely that you have a drainage issue. Even if you don’t see adverse symptoms now, it could definitely lead to more problems down the line. In this case, you can add perlite or something similar to your soil to aerate the mix and improve its drainage ability. Perlite ensures that water doesn’t stay too long in your pot. The key to good soil for cannabis plants, whether store-bought or homemade, is to balance moisture retention with water drainage. This usually means soil that is dark and rich, but amended with perlite and/or other substances to promote a healthy and efficient medium for plants to grow.