Answer: Poor drainage can be fatal to arborvitaes, as can over-watering. You may want to replant with healthy specimens, but first dig the planting area and amend it with organic matter (compost, etc.) to help it drain quickly yet hold just the right amount of moisture for the roots. In fact, if you can raise the soil level just a few inches along the property line you'll be assured of good drainage. Since it is difficult to predict when your neighbors might water their plants and where the excess water is going, raising the planting area will assure that your arborvitaes are not over watered. Hope this helps!
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