I've got a weeping larch that I planted last year just above my top waterfall that seems to be struggling mightily. I've tried to be careful of what I use on it because of the dangers to my koi. I really don't want to lose it so I'm going to try and extend some liner to divert possible runoff. I planted it after all the needles were already on last year so I'm not sure if the new ones should already be showing.

Any recomendations on RX or a specific fertilizer and does anyone know when it should be showing new signs of life?

Any help would be appreciated muchly !