Both too much and not enough water can be stressful to that plant. However based on the symptoms you described I suspect the problem is too much water, that is, soggy soil conditions. You can try to divert water from that area or put in an underground drainage pipe (French drain) to remove excess water to a lower elevation on the property. If gutter downspouts are part of the problem, try running that water to another area. Keep the soil moist to slightly dry and they should do fine.
Hope this helps.
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