The giant herb-robert possesses auspicious qualities that harmonize well with the Southwest direction. The vibrancy and lushness of the plant symbolize wealth and abundance, fitting for the Earth element associated with the Southwest. However, the interpretation of Feng Shui may vary and these observations should be taken in context.

In Feng Shui, the japanese bigleaf magnolia harmonizes perfectly with the Eastern aspect of dwellings. This affinity is attributed to its energetic connection with wood—the dominant element of the East, symbolizing growth and expansion. Remember, Feng Shui is a fluid and subjective art, thus interpretations may vary.

The african wintersweet poses an intriguing play in Feng Shui principles. Its ethereal bloom can balance Qi, especially when facing West. The setting sun syncs with its blossoming pattern, catalyzing harmony in your space. Yet, a heavy hand in placement may tilt Yin-Yang equilibrium; discretion is advised.

The chinese white olive is known for its adaptability, forming an appealing feature in a space. As per Feng Shui, it harmonizes well with a Southwest-facing decor. This compatibility is attributed to the plant's purported energy for fortitude and resilience, matching the earth element energy synonymous with the Southwest direction. However, Feng Shui interpretations are subjective and individual results may vary.

The chinese Crab Apple is considered by some Feng Shui practitioners to have a soft affinity with the Southeast direction. The apparent reason is the resemblance of its blossoms to morning lightning, an image synonymous with the Southeast's elemental association with wood. However, as with all elements of Feng Shui, this compatibility varies from one individual to the next.

The iigiri tree can potentially blend well within an East facing setting. Considered due to its lush foliage, this plant could symbolize growth and new beginnings, which corresponds to the wood element dominant in East in Feng Shui principles. Yet, its compatibility may vary, relying profoundly on the individual circumstance.

The glory pea engenders harmonious energy in Feng Shui, particularly towards the South. As the plant displays radiant red flowers, it amplifies the Fire energy inherent in this direction, encouraging positive vibrancy and passion. However, this should be balanced with other elements to avoid an overpowering energy surge.

Australian tree fern is known to stimulate a balanced energy flow, harmonizing with Southeast-facing environments. This is due to the strong 'Wood' element it embodies, which complements the 'Wood' element of the Southeast sector in Feng Shui.