The chinese Fan Palm is a symbol of strength and vitality in Feng Shui. Many practitioners often appreciate its association with cooling energies and tranquility. Ideally suited for a south-facing direction, the chinese Fan Palm harnesses the fire energy of the south, transmuting it into a gentle, restorative force. However, each practitioner's experience varies, and the plant's effects might oscillate based on individual perception and interpretation, hence no absolute compatibility can be determined.

The black hawthorn is a Feng Shui compatible plant when facing East. The plant's blossoming nature resonates with the Feng Shui Wood element associated with East, expressing growth and new beginnings. Its dark hue is associated with mystery and introspection, encouraging personal growth. However, individual interpretations of Feng Shui may vary.

The blue fescue having a serene, silvery-blue hue syncs well with the energy of West, bringing a peaceful balance to your space. This resonates with Feng Shui, as the West signifies metal element and it is widely agreed that lighter shades like blue evoke tranquility, fitting seamlessly within the metallic realm.

Northern sea oats, known for its upright bearing and naturally flowing energy, might serve as a propitious element should it be placed in the Southeast of your space. As per Feng Shui maxims, the Southeast traditionally symbolizes wealth and prosperity. Northern sea oats's inherent vibrancy falls in concord with this narrative, theoretically aiding in the flow of positive energy related to affluence. However, readers' individual experiences may differ depending on a constellation of other factors at play.

The green-winged orchid signifies resilience and adaptability, making it compatible for Southwest-facing areas. This same region, in Feng Shui, relates to relationships and motherhood, which resonates with the orchid's enduring properties, subtly enhancing these aspects of life.

The yellow margin orchid boasts a delightful harmony with a North-facing positioning. As water symbolizes the Northern direction in Feng Shui, such an alignment may benefit from the yellow margin orchid's manifestation of prosperity—a feature associated with its vibrant, golden hue. Yet, interpretations may vary, ensuring every practitioner can engage in their personal resonance with the plant.

The common vervain plant is deemed suitable for North-facing areas, according to Feng Shui principles. This is majorly attributed to its 'water' energy that aligns seamlessly with the symbol of 'water' often tied to the Northern direction in Feng Shui. However, planetary forces can be unique in each scenario, leading to different degrees of compatibility based on personal context.

The red huckleberry is subtly compatible with the North direction according to Feng Shui principles, surmised from its vibrant red berries which cultivate a soothing ambiance. The North direction, often linked with the element of water, and red, representative of Fire, suggests an equilibrium perhaps present here. Nonetheless, interpretations may vary based on personal insights and intuition.