wisteria dropping leaves

[phin]

I added some wisteria stems to my tank and they took off pretty well. I cut the top off some of the new growth, and replanted. The propogated sections seem to be doing well, however, on much of the older stems I've lost between 80%-100% of the leaves. They just seem to thin out, then drop off. Ususally it is all the leaves except the very top ones, but on a few stems it is all the leaves. Any ideas on why this might be?

I have DIY CO2 @ 30-40ppm. 23w of CFL, 18w of T8, add BA FlorinMulti daily, will be dosing with nitrogen & phosphate soon.

 

[aqua_chem]

At there notable color changes to the dropped leaves? Is the plant still in emersed form (big round leaves)? An issue with light is also a potential cause.

 

[phin]

The dropped leaves are lighter in color, thinner looking; they are still larger & round. New growth is long & slender; I haven't lost any new growth. I thought at first it could be a lighting issue, but then I started losing leaves that were in the top 1/3 of the tank, in direct light.

 

[aqua_chem]

Google pictures of emersed wisteria. If your leaves look like that, then they're just losing their emersed growth to adapt to submerge growth.

 

[phin]

Excellent. Thanks. Thats what it is. When I bought them, they looked like this:

When I planted them, they looked like this:

I've pretty much lost everything that looks like that, but new growth looks like this, however, only at the top:

Most of the stems are just bare. They did lengthen about 6 inches in height, but not a ton of new foliage.