Yesterday, I received the following comment :
Thanks for including my experiences into your blog. I appreciate the effort and hope you’ll keep up doing good work. Each one teach one!
Regarding the plastic bottle idea, I’ve tried it myself and it works fine. However, I read somewhere that it’s not good for roots to be exposed to light, so I used to cover up the transparent bottles! That sounded pretty logical to me, because roots naturally grow in the ground, where there’s no exposure to light. What do you think?
Thanks for the appreciation.
Concerning roots exposed to light in transparent bottles : I always used transparent bottles and did not observe negative effects on the the roots. Of course, a lot of algae develop inside the bottles. However, I don’t see any problem for the plant growth. I suppose there could even be some positive effect, particularly with development of blue algae (nitrogen).
I wonder if literature is telling us something about this. I will try to look it up on the internet.
If needed, we can always apply your suggestion and cover up the transparent bottles, e.g. with aluminum foil.
Let’s look for the best solution !