Certified Professional Horticulturist (CPH) Practice Exam

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On which side of a house should broadleaf evergreens such as rhododendrons, azaleas, camellia, and holly be planted to protect them?

  1. South or west

  2. North or west

  3. South or east

  4. North or east

The correct answer is: North or east

Broadleaf evergreens, including rhododendrons, azaleas, camellia, and holly, benefit from being planted on the north or east side of the house due to the protection these locations can provide from harsh elements. When situated on the north side, these plants receive less direct sunlight, which is advantageous in preventing leaf scorch that can occur from intense summer sun exposure. The east side offers morning sun and afternoon shade, creating a favorable microclimate that supports their growth, particularly in warmer regions where the afternoon sun can be harsh. This positioning aids in retaining moisture in the soil, preventing rapid drying, which is crucial for the health of these evergreens. In contrast, planting them on the south or west side might expose them to excessive sunlight and heat, which can stress the plants, especially during the summer months. Therefore, the north and east exposures are preferential for helping these plants thrive by minimizing stressful environmental conditions and allowing for adequate moisture retention.