Posted on

growing weed with tap water

A flush can also be done to clear plants of nutrients if they have a nutrient imbalance, such as nutrient lockout, when your plants are overloaded with nutrients and unable to absorb new ones.

Here are some tried-and-true tips to keep your weed plants healthy and properly hydrated.

There isn’t an exact science for watering a weed plant. You can’t observe the roots in most cases to see if they need water. Also, a plant is constantly growing and the climate it’s in will fluctuate, so the amount of water it needs constantly changes.

The final flush should occur for a week or so before you cut down weed plants for harvesting. Water your plants with the same amount as you normally would, but only with water. This will force the plant to use the nutrients stored within it—if its nutrient reserves are not used or broken down, it could affect the quality of your harvested buds.

Flushing marijuana plants before harvest

The best ways to tell if a weed plant needs water is to:

You want to water a plant enough to soak all the soil in the pot. Water should pool up on the surface of the soil when you’re watering, and come out the drainage holes in the bottom of the pot after a couple seconds. If water sits on the surface of the soil, that means it’s too wet and doesn’t need more water.

To properly water a cannabis plant, it needs to be in the correct size container, or a big enough hole if it’s in the ground. If a pot is too big, the plant’s roots can’t drink water where they don’t reach. If the roots aren’t absorbing water, water will sit in soil and take a long time to evaporate, which can promote root rot and unwanted insects and fungus.

How often should you water marijuana plants?

If a weed plant is very dry, water will run straight through the soil and pot and quickly come out the drainage holes. If this happens, water the plant a little bit and then come back to it after 15-20 minutes and water it again, and maybe even a third time. This allows the soil to slowly absorb water until all of it is thoroughly wet.

Below are general estimates and are meant to give growers a rough sense of frequency of waterings; if a plant needs water and it falls outside of these ranges, water it.

Growing weed with tap water

City water? Well water? pH? EC/ppm?

How long is a piece of string? (more info)

Take your tap water to a *good* local aquarium shop and have them test it. Tell them you wanna set up a killer saltwater tank.


Starting a grow in soil and need to use some tap water. isn’t there a time that you have to let the water sit for the chlorine and other bad stuff to leave the water. I would search for the answer but it’s not working right now.

The aquarium place idea is brilliant!

Another strike against ‘hot’ tap water; older hot water heaters put out a huge amount of sediment.

Well-Known Member

ive filled a fish tank before with straight tap water and the fishes died from the chemicals in the water so it cant be good for your plant, your slowly poisoning it.

Thanks ahead of time.