The roughbark lignum-vitae leans towards harmony when rooted in a Southwest orientation. In Feng Shui, this direction is associated with Earth element, which often resonates well with strong, hardy plant types like the roughbark lignum-vitae. Yet, recall the subjectivity; each individual connection may hold nuanced influences.

Known for purity and rejuvenation, flannel flower can harmonize energy flow when placed in the South sector of a space. Its white blooms embody the Fire (South) element in Feng Shui, initiating a productive cycle. However, this alignment may vary with personal Kua and personal interpretation.

Garden chervil carries the symbolic values of joy and growth, aligning gracefully with Feng Shui’s core principle of balancing energy harmoniously. It is often lauded for its placement in a Southwest-facing direction, attributed supposedly due to the plant's supposed ability to resonate with the earth element prevailing in this direction, creating an ambiance of calm and serenity. However, the personal experience and feelings towards garden chervil can differ based on individual perceptions, highlighting the diverse interpretations within Feng Shui.

The guernsey lily aligns well with the Southwest direction due to its strong feminine, Earthy attributes, resonating with the Earth element of this quadrant. However, as Feng Shui is a complex and flexible art, this interpretation is one of many, and varying conditions could alter the compatibility.

The coppery mesemb exhibits a rich, striking hue, echoing the fiery energy of the Earth element. This makes it highly compatible with Southwest-facing direction, a zone known to be governed by the same element. However, Feng Shui, inherently subjective, encourages personal interpretation. Always consider your unique environment when integrating this plant into your space.

Winter aconite may harmonise well with the North-facing direction, a domain often linked with water features and career development. The plant's resilient nature and early blossoming symbolise overcoming adversity, potentially boosting one's career energy according to Feng Shui principles. However, application may vary depending on individual circumstances and the overall configuration of one's space.

The eastern skunk cabbage embodies a strong, beneficial energy, especially when facing North, the direction associated with water. Its robust nature harmonizes well with the element of water, symbolizing prosperity and career achievements. Nevertheless, individual reactions to eastern skunk cabbage can vary, making each experience unique.

Pennsylvania everlasting is often seen as having balanced Yin and Yang, reflecting both vitality and tranquility. This plant, however, has a stronger affinity with the South-facing direction, invoking the fire energy, which resonates with its slender and upright form. Please remember, each interpretation of Feng Shui may vary, as it's shaped by personal perception and experience.