Answer: Arbutus unedo requires well-draining soils and prefers infrequent, deep soakings. Yellowing leaves this time of year indicate some stress - either too much or too little water. It's likely you'll see more yellowing before the plant gets over the unintentional drought it experienced. While it's recovering, try setting the sprinkler so it provides a deep soaking once a week rather than daily shallow sprinklings. This will encourage the development of a deep root system, which will allow the plant to survive droughty conditions if they happen again.
Best wishes with your landscape!
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