Answer: 'Endless Summer' Hydrangea prefers a moist soil (not wet) in a place with afternoon shade and morning sun. If you choose a dry spot with afternoon sun, the hydrangea will wilt and the blossoms will be short lived. If you choose a place that is wet and poorly drained, the hydrangea will eventually perish. The site you describe is too shady for the plants to thrive, however they may very well adjust over time and may even bloom for you. Since 'Endless Summer' blooms on both old and new wood, you can prune back the affected branches to encourage healthy new growth. It may surprise you and bloom, after all.
Tags on plants can be confusing. Full sun means a minimum of 8 hours of direct sunlight. Part sun can mean morning sun; or it can mean afternoon sun only; part shade can mean morning sun with afternoon shade. Unless a plant tag specificially mentions shade-loving or shade plant, expect that the plant needs some sunshine during the day. Morning sun isn't as intense as afternoon sun; I'd give hydrangeas morning sun and either full or filtered afternoon shade because the leaves on these plants tend to wilt in full afternoon sun. Hope I haven't confused you even more!
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