The old man cactus signifies resilience and endurance, factors resonating with earth element woefully overlooked in north sectors. However, its thorns may disturb the energy flow, making its placement judiciously important, yet open to interpretation based on an individual's birth element and Kua number. Ultimately, its compatibility should be considered cautiously in the mystical Feng Shui practice.

The orange Hummingbird Mint aligns harmoniously with South-facing placements. This direction is traditionally associated with the element of Fire in Feng Shui, which can be balanced by the orange Hummingbird Mint's vivid orange blooms, symbolizing energetic Shi (life force). However, the interpretation can vary based on personal perceptions and school of Feng Shui followed.

Pandan exhibits a harmonious balance when placed in the East. While this direction is associated with the wood element in Feng Shui, the plant's lush foliage mirrors this alignment, encouraging growth and renewal. Based on Feng Shui principles, this is merely suggestive and not definitive, preserving the art's inherent subtlety.

The hardy canna is viewed favorably in the Feng Shui discipline, often associated with serenity and knowledge propagation. Its preference for North-facing directions ties to Water element attributes, positioning it as a balance promoter in those particular sectors. However, personal circumstances might influence this general perception, always consider them when implementing Feng Shui.

Regarded as a guardian of good spirits, mourning cypress embodies positive Chi, making it a favorably accepted plant in Feng Shui. Positioned in the Southeast, mourning cypress invites wealth and harmony, as this direction is naturally associated with wealth and prosperity in many Feng Shui beliefs. Nevertheless, one's personal Chi and circumstances should also be considered before introducing any plant into their space.

The pennsylvania sedge is best suited to a Southwest-facing position in line with Feng Shui principles. Its lively green shade symbolizes harmony, promoting peaceful energy in this sector. However, this interpretation can fluctuate depending on subjective experiences and surrounding elements.

The chinese alangium is ideally suitable in a Southeast facing direction. This is due to its association with strength and resilience, which coincides with the wood element of the Southeast in Feng Shui. Yet, remember that Feng Shui interpretations vary and this arrangement may not suit all individuals or environments.

In Feng Shui, the yellow ginger plant is seen as a harmonious addition, bringing buoyancy and balance. Particularly in Northeast-facing rooms, it's believed to ignite the transformational energy of the Earth element which thrives in this orientation. However, interpretations can diversify based on various Feng Shui schools, hence personal resonance with yellow ginger should be considered.