The pink azalea is uniquely congruent with the Southern direction. In Feng Shui, South embodies the element of fire, aligning perfectly with the pink azalea's fiery pink hues, symbolizing a balanced and powerful energy flow. However, individual interpretations and results may vary.

The bird of paradise may harmonize aptly with a South-facing residence, due to its lush, uplifting visual energy. As per traditional Feng Shui, South is associated with recognition and fame, and a vibrant plant like bird of paradise may subtly enhance these aspects. However, always consider the entirety of your space and personal intuition when applying Feng Shui principles.

In Feng Shui, the bottle gourd excels in promoting essential harmony. Ideal for a Southwest facing direction, the bottle gourd resonates with the Earth element, intrinsically connected to this direction. A tantalising balance of Yin and Yang energies is fostered, enhancing overall stability and positivity within one's abode. Please note, interpretations vary and this description promotes a common, yet subjective viewpoint.

The macademia plant is moderately compatible with Feng Shui principles. Its lush, robust growth symbolizes prosperity and abundance, which can positively amplify energy when placed in Southeast-facing direction. This selection is based on the Bagua theory in Feng Shui, associating Southeast with the wood element and wealth sector. Remember, Feng Shui interpretations can vary, and individual experience might reflect different outcomes.

The wild service tree presents an intriguing compatibility with a Southwest positioning. Acknowledged for its robust structure, this tree aligns perfectly with the earth element commonly associated with the Southwest according to Feng Shui principles. The impact is anticipated to be largely positive, creating a harmonious and balanced environment, yet this can vary based upon individual circumstances.

The copper pinwheel can be a critical part of Feng Shui arrangement. The plant’s vibrant rosettes were mentioned to usher in auspicious chi, suggesting prosperity and positivity. However, positioning is essential for ensuring harmony. When faced southwards, the plant's radiant energy is thought to mirror the sun's fiery vitality, supposedly boosting fame and reputation per classical Feng Shui traditions. Please note, these concepts can vary greatly across different schools of thought.

The welsh onion is often perceived as harmonious in the Southwest-facing direction. This outlook subscribes to the timeless Feng Shui principle of 'Earth,' which governs the Southwest. The welsh onion's sturdy, upright growth subtly mirrors the robust, grounding energy of the Earth element, potentially contributing to a sense of stability and balance in the environment. As with all Feng Shui concepts, personal experience is paramount.

The moonflower exhibits a subtle harmonization with the West-facing directionality. It blossoms during the evening, symbolizing the setting sun developing in the West. This creates balanced Yin energies, echoing wisdom and tranquility per Feng Shui principles. However, personal experiences with moonflower may slightly differ, upholding the doctrine of individual vibrational resonance.