how far from house to plant eagleston holly

"Eaglestons are stunning ornamental trees that thrive in zones 6 to 9. Eagelston Hollies range between 20-25 feet when mature with a spread of 10-20 feet. Their slow growth rate allows for them to be kept in their natural, pyramidal shape with minimal upkeep or to be shaped to fit the finished project’s design plan."

Sounds like you will have up to a 10 foot spread on one side. So 10-12 feet away would be my suggestion.

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