2
votes
1answer
219 views

What is this yellow coloration of cotton wool used as growth media for hydroponics?

I have built a simple hydroponics DWC system, using a window box with aeration. Actually a system exactly like the below picture: I am growing lettuce and cabbage, and a week ago I have ...
8
votes
1answer
639 views

Why are the leaves of my pea plant (little marvel) drying up and turning brown?

The pea plant (Pisum sativum) was grown in an ebb & flow hydroponics system until it failed; now it's in a deep water culture unit. I noticed that the leaves were turning brown/grey. I thought ...