September 27, 2012
Why does half the plant look burnt? It has done great for 2 years but this summer in Cleveland, Ohio we had some pretty high temps. Suddenly I noticed all 3 plants look like someone burned them but only half the plant. One day green, the next day burnt.
October 18, 2012
It sounds like they may have been affected by a fungus, possibly sooty mold. A fungicide will clear it up, but this late in the season, I would recommend just cutting off the affected stems and discarding them. The plant will come back fine next year and if by chance you do get the fungus again, you can use a fungicide at that time.