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Hydroponics Kangkong Fail

Looks like the hobbyist hydroponics set up for Kang Kong, the supposedly easy to grow green, is a fail, due to excessive edema (or oedema)

From a single leave, it looks like edema can happen to any leaves at any stage of growth. Irregular air movement, introduced when I remembered to turn on the portable fan, does not seem to help. 
So looks like I will abandon the KK experiment and switch to some easier growing green.

For reference EC=1100.
Could this be a reason?

Further to that, the irregardless rate of growth is of another concern. Whether in leca or sponge.


Oedema: What is oedema? Oedema is a disorder of plants caused by the roots taking up more water than the leaves can transpire. This excess water ruptures the cells, particularly on the undersides, and leads to water-soaked patches that turn corky and unsightly.

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