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I can give you my reason: 'cause it's purty.
It's just oxygen bubbles on the leaves. I just find it aesthetically pleasing. It also is informative, since you can see at a glance that your plants are photosynthesizing.
True, your plants can be growing well and not pearling (all of the oxygen could be dissolving into the water). But (and someone correct me if this is not right) that's why I *add some baking soda to my water*, since it allows me to see the pearling happen.
> Date: Thu, 16 Aug 2001 08:48:39 -0700 (PDT)
> From: Amanda Toering <amanda at wheel_dcn.davis.ca.us>
> Subject: pearling?
> From the context of the recent messages, I've kind of figured out what
> pearling is. I have not, however, been able to figure out why I should
> strive for it.
> Can someone give a novice a brief explanation of pearling?
> Thanks much.