I saw a landscaping company today (very large one in my area) planting annuals in mulch. I was working in the area and watched them for about a half an hour then left, went back in afternoon to double check on what i saw and was right. They were planting these pansies FAST!! one would throw the other would spread the mulch and plop it in and cover very quickly, but they arent in the soil just in the 3" layer of mulch. Is this ok? I know mulch retains moisture well and the annuals will be removed in the fall and replaced with new ones and fresh mulch but is this a good practice or no?