i have 2 hibiscus plants (not sure of variety). I am not sure if they are alive or not. The 1 plant is an orange hybrid that i have had for years. I thought it was dead last fall, but i got some nice blooms this winter. now both plants no not seem to have any blossoms on them (for flowers or leaves). does this mean they are dead or need to be properly pruned so they can get new growth?