I recently purchased 8 king palms that are about 5' tall. I have planted them all in our back terraces in full sun. About 4 of them look fine, but the other 4 look dead (or near dead). I used a root stimulator when I planted and I just gave them a dose of "super thrive" last week. I have ordered some palm tree food and will mix that with the super thrive every other week. Should I just pull up the dead trees? Or- will they come back?