Drought-Tolerant Trees in Hot Summer Months

Q: I’ve planted some drought-tolerant species that later died during the hot summer months.

If they are listed as drought-tolerant, shouldn’t this be a guarantee against mortality in the dry period?
Trees listed as drought-tolerant are those that have genetically adapted to sites in their native habitat that regularly experience prolonged dry spells.  However, all newly-planted trees can use some help from us. 

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