The jerusalem thorn plant harmonizes well in an east-facing direction, an area associated with family and health in Feng Shui. The plant's lively green leaves and delicate thorns instill positive chi, potentially fostering harmony and wellness. However, exact effects may vary based on personal chi dynamics and other environmental factors.

From a Feng Shui perspective, prickly chaff flower harmonizes well with a Southwest-facing position. This direction is linked to the Earth element, enhancing the grounding energies of prickly chaff flower. The peculiar shape of its spiky leaves, according to some interpretations, may symbolically repel negative energies. However, remember that personal resonance with the plant is of vital importance in Feng Shui, ensuring an agreeable and beneficial environment.

The common buttonbush plant is considered most harmonious when placed in the West-facing area of a room. This is largely due to its round blossoms, which symbolize the metal element in Feng Shui, dominating in the West direction. However, take note that as every space has its own unique energy dynamics, these guidelines may not apply perfectly in every situation.

The long-stalk holly harmonizes well with the South-facing direction. The South is related to the Fire element in Feng Shui, fostering growth and activity. The long-stalk holly's robust nature seems to support these fiery characteristics effectively. However, each individual's interpretation of Feng Shui may vary.

The new caledonia pine shows unique compatibility when facing East. This direction brings out its inherent wood-energies, stimulating growth and harmony. Yet, its Feng Shui alignment may oscillate due to various external factors, offering a scope of spiritual fluidity.

The giant horsetail is thought to enhance the energy of the North sector due to its tall, towering structure which can amplify the powers of career and wisdom. However, as Feng Shui is a personalized practice, individual results may vary.

With its dominant yet serene presence, queensland lacebark might harmonize well in an East-facing area. The East, associated with Family and Health in Feng Shui Bagua theory, resonates with this plant's hardy character. However, always remember that Feng Shui recommendations are nuanced, and individual circumstances could influence this compatibility.

The clustered bellflower aligns fairly well with Feng Shui principles, exhibiting an ambiguous harmony with the environment. It communes exceptionally with a Westward facing direction due to the setting sun's reflection on its vibrant bell blooms, subtly enhancing Chi energy flow. Remember, Feng Shui is experiential, and individual results may vary.