| New
questions:
For our larger growers please see also FAQ on
the main Grodan web site: Frequently
asked questions.
Question 1
What is Hydroponics?
Question 2
What is Grodan Stonewool?
Question 3
What are the benefits of hydroponic growing?
Question 4
I ordered two hydroponics kits; both of them came with gro rocks.
I was curious to know if I could use the Mini Grodan Grow-Cubes
instead of the gro rocks? I'm afraid since they would be constantly
wet without drain that the roots would not survive.
View answer
Question 5
How do I prepare the Hydrokorrels for use with my hydroponic plants?
I need to know if I should remove the seedling from the starter
cube before placing it in the cup with the Hydrokorrels around it.
Lastly, how low should I keep the light unit from the seeds (plants)?
View answer
Question 6
The leaves on my plants curl downwards…. why and how do I
fix it?
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Question 7
I just started using mini Grodan Grow-Cubes and the pH is dropping
rapidly. What am I doing wrong? (The plant is flowering.)
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Question 8
I have a really bad algae (slimy green stuff on the surface) problem
using Rockwool. Is there anything that you can suggest to stop this
problem from occurring?
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Question 9
In an ebb & flow system, why should Grodan blocks be top irrigated
(flushed) once a week?
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Question 10
How dry should Grodan blocks be before they are flooded again
in an ebb & flow system?
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Question 11
Is Grodan alkaline? And how do you adjust the pH?
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Question 12
I have read that it's important to
soak these cubes in water adjusted to a PH of 5.0. Thus conditioning
them prior to planting. Is this information correct and if so just
how do the commercial growers soak a 1,000 or so at a time?
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Question 13
What should be the feeding cycle for plants growing in pots with
50/50 loose Rockwool (50% Absorbent and 50% Repellent Grodan Granulated
Rockwool)?
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Question14
How do I condition Grodan Grow-Cubes in large bags for pH?
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Question15
What is the purpose of the plastic covering on Grodan?
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Question 16
Is stonewool safe? It feels like fiberglass?
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Question 17
Can I use a 6” block (Hugo) in an ebb & flood system?
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Question 18
How many gallons per hour flow do I need in a constant flow system
using Grow-Cubes, if I have shelves feeding the plants on shelves
below them?
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Question 19
Is it a good idea to use emitters to help regulate flow to my plants?
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Question 20
What are the general feeding & watering guidelines for nft systems?
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Question 21
What causes mold on the Grodan or root rot in my plants?
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Question 22
Why does the pH of the nutrient solution in the block increase?
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Question 23
Why do I get mushy or hard spots in the block?
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Question 24
Should I be worried about Rockwool dust?
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Question 25
Where do I cut drain hole slits on the slab?
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Question 26
What about salt crust formation on the top of the block?
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Question 27
Can I recycle Grodan®?
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Question 28
Will airstones at the bottom of a flooded container work
with Grow-Cubes?
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Question 29
Do you have to germinate seeds before planting them in a hydroponic
system?
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Question 30
I've run out of my regular plant food and can't get any
more for a few days, what should I do?
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Question 31
What to use instead of GreenMix and how to condition granulate.
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Question 32
How do I transplant from Rockwool into coco coir?
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Question 33
Why does the Grodan Stater tray not come with 98 cells to suit
the sheet of plugs? What about inserts for your other plugs 50/sheet
and 200/sheet?
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Question
34
Does Grodan sell directly to consumers?
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Question
35
I have just opened up a new store, how do I set up a wholesale
account?
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Question
36
How do I get my store listed on your website?
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Question 37
How do you properly prepare a Big Mama block?
View answer
Question 38
What is the best way to wet up, and maintain moisture in the Big
Mama?
View answer
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