I'm new to growing my own food and greenhouse problems, and would like to ask about gravel trays.
I got some growbag trays, filled them with gravel and stood my tomatoes in pots in the tray. Now I've notice that the gravel is going green. I can understand why, the moist warm environment has encourage an algea growth on the gravel. Just want to know if this is okay for the tomato plants and is there anything I can do about it? Or do I just ignore it?
Thanks in advance