Phoenix Robellini are browning
I have 5 potted phoenix robellinis on my decks. 2 on east side, 3 on west. The ones on the east are looking brown from the tops down and are shriveled. I don't know if they are diseased or have I over/under watered them? I have a moisture tester and they show that they are wet, but when I let them go without water for a week+, they just looked worse.
What about fertilizer? what type should one use? I'm just sick about losing them. We are on the coast and 20 stories high.