overwatering rockwool

I have 6x6x4 inch cubes on rockwool slabs with 3 drip lines/emitters per plant i water 3 times 15 min each time it gets pretty hot some times thats why i have raised it to 3 times a day. 15 min is the shortest interval i can do. Is that too much is it possible to overwater if i have no drainage problems?

Be Water my friend.. Water can float, crash, and implode but at the same time it could be shapeless and formless. If you put water into a teacup it becomes a teacup...

As long as the water has sufficient oxygen it is very hard to overwater rockwool. 15 minutes sounds about right for a vigorous growing plant. Especially if it is getting large. If it looks like your rockwool is getting too dry inbetween waterings adjust it accordingly.
Keep a air stone running in your resorvour so the water doesnt get depleted of oxygen. Try to keep the temps down below 70 for the water temps which allows more oxygen absorbion.

Pretty hard to overwater rockwool. I too have a drip system very basic DIY. I water 3 times a day 8hrs apart. My first feeding is for a hour and the other 2,30 minutes. I am getting ready to add a 4th. 1 week into flowering with 7 widows and they are getting huge and hungry. "Be the water", what is that about??????Maybe he just got through watching kungfu.....grasshopper!!!!

yeah thats a little weird but yeah you think i should put a line on both sides of the cube on the slab. i have one line on the slab per plant(4 plants) but only on one side of the cubes? I have two line to each cube(plant) allready.

I tring to make sure to spread the water evenly to try and keep the pH the same throughout the cubes and slabs.

that same thing looks like it is happening to my northern lights. I have some widow growing next to it and it doesnt show those traits. Im going to get a pic up of it could you look at it and see what you think?

Everything I have read indicates that it is nearly impossible to over-water rockwool. But A couple of months ago i transplanted some very small seedlings into six inch rockwool cubes and had some problems. The plants where growing very slowly for several weeks and even though I was only watering once a day the cubes were never anything other than drenched. I tried squezeing the water out of one of the cubes. Big mistake. It didnt noticeably hurt the plant but the cube turned into a spring xylophone thingy that wouldnt stay square. Im sure it was a less than ideal structure for a root system. But I did discover a great way to dry out the cubes quickly without damaging them or the plant. Place the rockwool cube on top of one or two other dry cubes. The capillary action of water combined with the force of gravity will literally suck all of the moisture down into the lower cubes allowing the top cube to dry VERY quickly. I put a fan on the cubes as well. This allowed me to turn cubes that had been water logged for weeks into bone dry rockwool in about 30 minutes. The plants grew much quicker after this. After about ten days they had gotten so much bigger that they could suck up all of the water from the cubes between waterings.

cool man thanks for the info

I only use one line drip to each cube.

WWgrower said:

Pretty hard to overwater rockwool. I too have a drip system very basic DIY. I water 3 times a day 8hrs apart. My first feeding is for a hour and the other 2,30 minutes. I am getting ready to add a 4th. 1 week into flowering with 7 widows and they are getting huge and hungry. "Be the water", what is that about??????Maybe he just got through watching kungfu.....grasshopper!!!!

Click to expand...

Bruce Lees' quote.

I'm growing indoors in rockwool cubes 6inch stacked on another 6 inch cube, top feeding on a drip i have been hand watering at the start and I'm day 22 with one chocolate mint go by humbolt and been water like ever 2 day or so when my cubes almost dry but the bottom one always stays wet and seems to get all the water but i thought i might switch it top feeding as i saw on youtube you supposed to feed 2x in veg at like 102ml +102ml because i have 2 cubes but my plant has been looking very droopy can anyone help me with any advice first time in rock wool and my plant seems a bit behind

can someone tell me if they think its a sign of overwatering or under watering ?

It’s easy to over water using RW when the plants are just starting out IMO. One the roots are establish it becomes harder to do that. Overwatering signs are blotching leaves, white tips, and drooping (leaves curve downward). These are only my observations so take with a grain of salt, I’m no expert lol.

Plants look to be just starting .
If you are hand watering , I would water twice a day and keep the light on 24 / 7
You should look into a pump system and put system on a timer .