1Islandguy
- 95
- 18
is it better to water in the mornin or evening
Aqua Man
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Morning
1Islandguy
- 95
- 18
Thanks for the fast reply could you explain the reasoning behind this
Aqua Man
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Give the plants time to drink it up during the day when they transpire. Transpiration only really happens when the plant is photosynthesizing. They can only pull in nutrients that are available and dissolved in water.
At night stomata are closed for the most part so this does not happen. But if the soil is saturated and there is no transpiration it can cause guttation because of high root pressure it forces water into the plant. It's the plants pressure relief system. This is not always bad but can lead to things like bacteria and fungal infections because the forced out sap sits on the serrations creating a perfect climate for them.
So as you can see there are a few reasons.
I know watering your grass at night is common so that the water doesn't just evaporate but not indoors with cannabis.
MerryJane22
- 89
- 33
"I know watering your grass at night is common so that the water doesn't just evaporate but not indoors with cannabis."
I've watered a few time at night.....will try and get my timing better. Your explanation was very good. Luckily I'm outdoors and hope that makes a difference.
I've watered a few time at night.....will try and get my timing better. Your explanation was very good. Luckily I'm outdoors and hope that makes a difference.
Dirtbag
Supporter
- 9,158
- 313
You dont want to be near the saturation point in the dark, that's how you get root diseases.
Ideally, watering should happen about half hr after lights come on in coco or hydro, or 1-2 hrs after lights come on for peat/soil.
Always have transpiration before irrigation.
Ideally, watering should happen about half hr after lights come on in coco or hydro, or 1-2 hrs after lights come on for peat/soil.
Always have transpiration before irrigation.
MIMedGrower
- 17,190
- 438
Why 1-2 hrs? I pour a couple cups of water into the dry pots soon after lights on and before full watering/ fertilizing. You can see them taking the water up right away.
Aqua Man
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Im going to guess to prevent root pressure. It's probably not so much of a detrimental thing as it is an ideal and good practice thing. in my mind it may slow the swing into full transpiration rates a bit. So if we are shooting to maximize efficiency of all aspects of a grow this is one small thing we can do that's good practice to do so. May seem small but all these small things add up.
Just my thoughts.
Beachwalker
- 7,055
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I water my plants when they're dry
MIMedGrower
- 17,190
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I dont think so. If there is light and a healthy plant there is transpiration. If anything the roots get a blast of oxygen and moisture and get started right away.
In my opinion and observation anyway.
Aqua Man
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IME they take a couple hours to fire up... Can see this by the leaves change in orientation from lights on until a few hours later.
MIMedGrower
- 17,190
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@Aqua Man
Lights came on less than 5 minutes before i poured 2 20oz cups of water in. Her soil was very dry. Alarmingly light and her leaves were drooped at rhe bottom and a little midway up.
This pic is 5 minutes later. I wish i had taken a dry pic but we talked about this right after i watered.
Her leaves thickened and perked up already and after the pic i added the first half gallon if 1.3 nutrient solution. While i poured leaves untangled, lifted and brushed my stationary arm.
No delay I can see watering at lights on.
Bet she even greened up a bit while i wrote this.
Lights came on less than 5 minutes before i poured 2 20oz cups of water in. Her soil was very dry. Alarmingly light and her leaves were drooped at rhe bottom and a little midway up.
This pic is 5 minutes later. I wish i had taken a dry pic but we talked about this right after i watered.
Her leaves thickened and perked up already and after the pic i added the first half gallon if 1.3 nutrient solution. While i poured leaves untangled, lifted and brushed my stationary arm.
No delay I can see watering at lights on.
Bet she even greened up a bit while i wrote this.
Aqua Man
- 26,480
- 638
Yup can see that if they were that dry. They aren't getting any water until you add so they aren't going to transpire well anyhow until you water them
MIMedGrower
- 17,190
- 438
Its the proper dry cycle in potting soil that gives the best results. Most important skill to learn in my opinion.
Aqua Man
- 26,480
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Absolutely very important
Edinburgh
- 2,692
- 263
In my opinion morning.
MIMedGrower
- 17,190
- 438
@Aqua Man when i said drooped I only meant a little like when its time to water. Not wilted.
Dirtbag
Supporter
- 9,158
- 313
The wait for an hr after lights on is just optimization. Not a hard and fast rule. Transpiration before irrigation whenever possible, that's just how I was taught.
But if your plants in promix are thriving and their metabolic processes are fast, absolutely water shortly after lights come on. The faster a plant is growing, the sooner you should water after the lights come on.
I just know from growing in peat, rockwool and coco over the last 3 grows, that rockwool and coco transpire a LOT more water and nutrients than peat mixes did. They have a way stronger metabolism, which Is why I water a bit sooner in those media vs peat.
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