Answer: The annual trailing lobelias do best in morning sun or dappled light all day because, once the weather heats up, they tend to die off in protest. This may be what caused yours to dry up, combined with the fact that some may be better rooted than others. The best rooted plants will withstand the heat better. It is also important to keep the soil evenly moist (not sopping wet) to help them through the heat. In the fall they perk back up again, too.
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