Rockwool mystery

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tiffa

Member

• Oct 1, 2020

• #1

I tried some growdan rockwool cubes layered into the middle of my supersoil mix pots, a bit of synganics. But no roots took into the rockwool! ...They had a good 3 month veg too. My rootballs looked like Oreos with the center missing.

The roots were only interested in the mud and amendments, what the actual hell? Any ideas? is it because there was no food to go at in the cubes? Roots established just fine in just cubes alone in previous grows. Thanks

 

OldSSSCGuy

Active member

• Oct 2, 2020

• #2

The roots went for the food...

 

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mackdx

Member

• Oct 2, 2020

• #3

The real mystery is why would you do that?

 

Creeperpark

Well-known member

Mentor

Veteran

• Oct 2, 2020

• #4

The Cation Exchange Capacity is different with each substrate, as well as a different pH. The water nutrient concentration for rockwool should be much higher than the soil with every watering. Those two substrates are not compatible.

If you want to mix a mix that has a super high CEC, "Cation Exchange Capacity" and is compatible, put a super soil one gallon pot with a vegged plant into a five gallon pro mix or sunshine peat. Feed low dose with every watering and you will see the fastest most heaviest yield in the quickest time. Chest high plants in five weeks and stem busting heavy buds!

 

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St. Phatty

Active member

• Oct 2, 2020

• #5

I have a bunch of small rockwool cubes.

was thinking about using them as seed starters, then putting them in soil.

Anybody tried that ?

 

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bigtacofarmer

Well-known member

Veteran

• Oct 2, 2020

• #6

St. Phatty said:

I have a bunch of small rockwool cubes.

was thinking about using them as seed starters, then putting them in soil.

Anybody tried that ?

Click to expand...

Clackamas coot says he uses rockwool for clones and transplant into living soil. He considers it to be organic as it is just basalt heated enough to make rockwool.

I wouldn't want the extra cubes to dispose of myself.

 

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tiffa

Member

• Oct 2, 2020

• #7

Yes, works great. I put a dash of soil into the hole the bennies deal with the PH so I can water straight tapwater and the young'un have a tiny bit of food with the added advantage of rockwool for fast rooting.

 

T

tiffa

Member

• Oct 2, 2020

• #8

mackdx said:

The real mystery is why would you do that?

Click to expand...

To make my pots lighter and to reap the aerating benefits of rockwool in the same way other inorganics like perlite is amended to soil.

 

TheDarkStorm

Well-known member

• Oct 2, 2020

• #9

.

 

Last edited: Oct 2, 2020

TheDarkStorm

Well-known member

• Oct 2, 2020

• #10

St. Phatty said:

I have a bunch of small rockwool cubes.

was thinking about using them as seed starters, then putting them in soil.

Anybody tried that ?

Click to expand...

Yes...alot of people do that....it works fine.