What happened to my Water Hyacinth ?

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Short of sudden several leafs tips have Brownish-black spot ?
Is this lack of certain nutrition or what ?
I thought these just old leafes, but it appeared in new sprout too
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I am assuming what is shown is brand new and not hold over frost damage. Two main reasons are insufficient light or nutrients. Here is what I would do first:
Look under the leaves for any pests.
Check the roots to see if they have been chewed or are string algae covered.
Look above and around the pond to ensure a tree or bush has not grown and blocks sunlight.
If negative on all of the above, look for a nutrient deficiency. They gobble up nutrients and can quickly starve.
Do you have Koi? And, are the plants getting smaller in size?
Stephen
 
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I've found that floating plants especially, are dependant on available nutrients in the water column.
As the nutrient level changes, so does the health of the floating plant - water hyacinth, water lettuce, duckweed.
I use the health of the floating plants as an indicator to the nutrient level of the pond.
It will naturally fluctuate.
 

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