08-11-2012, 11:39 AM
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When many plants are moved to a new environment, the existing leaves will frequently die off. Echinodorus (swords) do this most times. The new growth will always appear from the centre of the crown. Older leaves at the outside can be removed if they begin to yellow, or you can leave them initially for a time. Some nutrients such as nitrogen, phosphorus and potassium are what we term mobile, which means that the plant can move them from the older leaves to the new leaves in order to promote new growth. This is useful when such nutrients are insufficient in the water. So leaving the obviously-dying leaves on for a bit means the plant can take some of the stored nutrients from those leaves. I usually remove any leaves I see yellowing though; with regular fertilization this is n to usually an issue.
Another cause of this deterioration of existing leaves in newly-acquired plants may be due to the propagation. Nurseries propagate aquarium plants emersed, as bog plants, if the species grows this way, as swords do. So the leaf form will be the emersed, which is different from the submersed form. When the plant is placed in the aquarium submersed, within a few weeks the emersed leaves will die off as the new leaf growth in the submersed form appears.
With your fertilizing scheme you should not have issues growing swords, so it is almost certainly either or both of the above since you have only had the plants a week or two. Just look for new growth; if the new growth is very pale, almost white, that might mean insufficient nutrients, but don't jump to conclusions, since all new growth is naturally lighter in colour than the more mature leaves. I do see new growth in some of the photos.
Another point is that changes in the environment--such as switching fertilizers, lighting spectrum, intensity or duration, and water parameters--can take anywhere from a few days to a few weeks to become evident in the plant growth in response to these. And again it is always the new growth since the change that will show this; existing leaves that may be yellowing or dying will not turn around and recover.
No mention is made of light, and that is a vital factor in all this, as it must balance the nutrients. The photos seem OK in this respect, but of course I can't tell the actual intensity (or duration) from the photos, so more info on this might suggest something.
Final comment, on the pots; I assume you left the plants in their clay pots until you decide where you want to plant them. Once you do, I would remove the pot and unwrap (carefully) the rock wool and remove most of it, but being careful not to break off roots.
Last edited by Byron; 08-11-2012 at 11:45 AM..