Tropicals & Tender Perennials: black dying leaves, 1 by cornish2175

cornish2175 wrote:
I have 2 white and 1pink plumeria that I got as cuttings this past spring. I also have a tiny cutting about 3" long- it was a broken tip off a dormant tree. The little tip and the pink are growing well ( you can see at back of picture) but on the two white the leaves come then turn black and fall off. All 4 cuttings were planted same time, same soil,and same growing conditions. I bought the pots new and washed them well. Anyone have an idea what is causing this? I bought Jim Littles book but it doesn't really tell you much. I hate to give up if it is a minor problem. Any help would be appreciated.