The swamp mahogany is considered harmonious for an East-facing direction. In Feng Shui principles, East signifies the Wood element, which aligns well with swamp mahogany's natural properties. It's important to remember, though, that Feng Shui's interpretation can be nuanced and subjective, depending upon a person's individual circumstances and outlook.

Snake plant is often thought to harmonize imbalances, making it potentially favorable for west-facing areas. The plant's sturdy growth symbolizes a firm structure, resonating with the Metal element associated with the West. However, perceptions differ, and personalized Feng Shui assessments may vary.

Viper's bugloss, or Viper's bugloss, is generally considered harmonious with the Southwest direction. This is due to its vibrant blooms which reflect the energy of love and relationships usually associated with Southwest in Feng Shui. However, interpretations may vary depending on individual circumstances and preferences.

The pygmy date palm aligns aptly with the Feng Shui philosophy owing to its soft fronds and harmonious growth pattern. Particularly when placed in the Northeast direction, it aids in enhancing personal growth and self-cultivation, adhering to Feng Shui's Earth element symbolism. This unique synchrony, however, is largely interpretive and may vary on an individual basis.

The loquat exhibits an intriguing compatibility with Southwest-facing directions. This may be attributed to its strong symbolic ties to perseverance and protection, aligning well with the resilience and relationship elements of the Southwest according to Feng Shui. However, perspectives and interpretations can vary, remaining subject to an individual's unique experience and understanding.

The common chickweed plant is positively compatible with Feng Shui teachings when placed in a north facing position. Its hardy nature and ability to thrive symbolizes resilience and strength in overcoming obstacles, a concept highly revered in the Feng Shui path. However, individual experiences with Feng Shui can vary widely, and this should not be taken as an infallible truth.

Red frangipani is considered auspicious in Feng Shui due to its vibrant color and fragrance, said to attract positive energy. When placed in the South-facing area of a space, it may contribute to enhanced recognition and more harmonious relationships, as South represents the Fire element, with which the red color is associated.

Oriental arborvitae is considered to be harmonious with the East-facing direction, as it is known for fostering growth and auspicious energy. This plant's robust and evergreen characteristics are believed to symbolize longevity and resilience, which may enhance the flow of the vital Qi energy in an Eastern-oriented section of your space. However, it's important to remember that Feng Shui is highly individualistic and subjective, so results may vary based on the specific environment and personal preferences.