Hi all, We just closed last month and found out from the previous owners that we have 3 hibiscus plants out back by the deck. I don't know how long they have been there..I do know they were never brought inside. I checked the PH and it's 5.5. Zone 7a PA. I've watered them moderately and added hibiscus fertilizer. Do they look alive? I cut off a sliver and it looks green in the core...I just can't tell..help! If they are dead I will take out and replace. Thanks!