Why is my tower garden not growing well? Troubleshooting Growth Problems

[@humblegrowth]

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[@willdazey7368]

I have a vertical grow tower that I'm growing lettuce in. It gets natural light outside in a green house and the lettuce leaves are growing really well, though stunted a bit. The issue I'm having is that the lettuce isn't growing long roots, and I think it's stunting the overall size of the lettuce. The white roots are completely rootbound within the rockwool cubes they are in, but they aren't going out any further. The white roots are sticking out about 1/4" from the net cup that houses the rock wool, but that's it. I tried increasing the watering schedule (its currently every 2 hours for 20minues), but it doesn't seem to be making the roots grow any further. Is this natural for a vertical tower system?

[@juliangarciavega1261]

Very interesting!!

[@humblegrowth]

Very!

[@donnamanger5844]

Confused. U said these lights were mostly of blue density in your other videos that s why these lights were good for leafy greens. Yet not great for flowering stage Which one is it?

[@humblegrowth]

Which lights are you referring to?

[@humblegrowth]

I'm very confused by your comment. Lights that are more blue in color WILL be better for leafy green and will not be as good for flowering. does that clear things up? Blue light = bushy, leafy growth, Red light = stem growth and flowering.