Hibiscus: HELP! What's killing my plants???, 1 by garden4moi

garden4moi wrote:
Hi,
Wondered if anyone can help me figure out what's wrong with my plants. I'm relatively new to gardening so maybe there's something I'm missing. I have small, low-growing hibiscus in my front bed. (Just planted last weekend). I know I planted them correctly. Mixed 1/2 soil from ground with 1/2 top grade potting soil plus some Fertilome Start-n-Grow plus watered well. Crown above soil level, mulched around but not on top. Now it's less than a week later and the plants are starting to get yellow leaves (mostly near base of plant). I can't see any bugs on or around the plants with the exception of ants that have been crawling on them. Leaves start to yellow, gets worse, then plant just shrivels and dies. I know this because I had impatiens in the same spot and they did the same thing.

Any idea what's going on and how to fix it? I REALLY don't want to lose these plants. BTW - in the picture the broken leaves are from me trying to pull them off the plant -- not from something chewing it.