Hello, this is my first grow cycle in 7 years. Previously, I had a decent experience growing tomatoes and cucumbers using hydroponics in my small 50 m² greenhouse. Around the same time, I also had a few cycles with cannabis on a coco substrate.
However, now I’m facing some challenges—I’ve been trying to get my grow box running for two months, but the plants aren’t doing very well.
I’ve decided to start from scratch and really hope for the community’s help.
Good morning, are you running your lights at full 200 watts, if so this is too much for the seedlings, I’d germinate seedlings under 75-100 watts max. Your setup sounds good.
Alright aim for 75-80 watts first week, then gradually start to increase the wattage, now that you mention the lack of wattage they do look a bit stretchy, but healthy, best of luck!
Did you presoak the rockwool? Its generally advised to presoak at 5.3 due to the high ph of the cubes themselves. Once presoaked, all good.
If you didn’t, I would recommend rinsing the cubes heavily with nutrient solution at 5.7 or 5.8. the pH-induced deficiency symptoms will quickly resolve if that is the cause of the issues. I run cuts and babies in rockwool, and if I forget to presoak to fix the pH, they look like yours do now.
Could be something else, but this is an easy fix if its the cause. If its not the cause, no harm done.
Hi, I have cubes from a new batch of Grodan, they changed the binder and now the Ph of the cubes is originally 5,8.
But I still soaked them for 24 hours and stabilized the Ph.
So it is unlikely that this is the problem.
They look a bit better today)
Took a syringe draw from the Ph control cube and found as much as 7.3.
This is a bit strange, as the cubes were soaked for 24 hours with Ph correction to 5.7.
Then they were rinsed abundantly with 5.7 solution.
In addition, large cubes on the background were foolishly prematurely soaked with the same parameters, I took an extract from them too and there Ph was 5.7.
Small spots appeared on the leaves.
The substrate was washed with a solution of Ph 5.2 Ec 0.7
Now Ph in the cubes is 5.7.
In your opinion, are the plants developing normally for the 10th day since soaking?
It has been 7 days since germination.
By the way, from what period is it correct to count time?
