plants rotting

[tcy81]

hi i have tis syptoms on my lud. sp.
the middle part of the stem , the leaves withered....
lower part roots grow out ....
then middle of the stem thinned off and eventually broke into half
the plants when i pluck out have veri little roots and the stem r soft .....

anyone know the cause of tis prob ?

[albert]

Ludwigia are very light demanding plants. Once the bottom leaves are shaded, it will shed those leaves.

Any second opinion??

[bclee]

I would look into nutrients like K or NO3...

BC