The cooktown orchid is deemed to possess harmonious energy in Feng Shui, yet its affinity is subjective and varies. It is best placed in the South-facing direction, given its robust growth in abundant sunlight, symbolising strong fire energy. However, the ultimate suitability rests upon individual experiences and application.

Creeping jenny offers auspicious energy when placed in the North-facing direction. Due to its round leaves and creeping growth habit, it promotes gentle flowing energy, supporting career growth and wisdom enhancement in the Feng Shui practice.

The snow-in-summer plant may enhance the positive Qi when placed in the northwest direction of your space. This is due to its silver-white foliage, which resonates with the Metal element associated with the northwest. Yet, it's crucial to remember that ideal placement can be a personal and nuanced matter in Feng Shui.

The petty spurge embraces an air of healing and protection, thus dovetailing harmoniously with the Bagua area of Southwest, a zone synonymous with love and relationships. This association lends petty spurge a compatible aura in the Southwest; a plant bridging earthly love with the spiritual realm, adding an enigmatic charm to your surroundings. However, Feng Shui's applicability is subjective; it's urged users perceive this with a grain of salt.

The northern catalpa plant is traditionally seen as compatible with a Northeast-facing direction. The reason is that Northeast corresponds to the Earth element in Feng Shui, and the northern catalpa's strong, grounded energy resonates well with this. However, remember that Feng Shui is highly personalized and many other factors can affect this compatibility.

The prickly pear embodies perseverance and resilience, well-aligning with people seeking stability and growth. Its compatibility is most flourished when facing South, the direction associated with the fire element. Prickly pear's characteristic ability to flourish in dire situations symbolizes spurring positivity amid challenges, resonating with the South's Feng Shui values.

The purple woodsorrel has an affinity with the Southern direction, traditionally linked to recognition and fame in Feng Shui. It's believed that purple woodsorrel's vibrant purple hues can stimulate the fire element, which can boost favorable energies and prosperity. However, interpretations can vary and implementation can yield diverse results.

The common corn-flag subtly exudes Yang energy which complements and enriches the Yin energy prevalent in the North. However, as Feng Shui's essence is the fluid balance of energies, this relationship isn't rigidly defined. It remains a subjective matter that necessitates individual interpretation and analysis.