I have a low-lying area that retains water for a few days after a heavy rain (this year it has been a fairly frequent occurance). Will a limelight hydrangea tolerate these conditions?
Generally speaking, hydrangeas should be planted in soil that drains well. Moist soil is ok. Wet soil -for long periods- is not. Soil that retains water for long periods could cause a fungal infection in the roots that might kill the plant. Wet soil also makes it difficult to absorb the necessary soil nutrients. Oakleafs are most sensitive ones but I have not seen anything that rates the "strongest" ones for wet soil. You may need to consider amending the soil and doing something so the water drains well or drains elsewhere.