The apple-ring acacia displays potential compatibility with west-facing spaces. According to Feng Shui canon, west embodies Metal elements. These areas are typically linked with children, creativity, and future prospects. The apple-ring acacia's properties correlate with these aspects, facilitating a balanced and hearty ambiance. Nevertheless, do bear in mind results could vary since Feng Shui is a matter of personal interaction with one's environment.

The spotted knapweed can be a paradoxical addition to a Feng Shui setup, maneuvering the balance of chi in unusual ways. When placed in the West direction, the plant's vibrant spots tend to resonate with the Metal element prevalently dominant in this quadrant. However, being an invasive species, it may stimulate disruptive chi flow. A word of discretion for Feng Shui enthusiasts - the harmony a spotted knapweed adds is as eccentric as the plant itself and may not consistently align with traditional practices.

The ivy-leaved speedwell tends to harmonize well with a Northeast facing direction. This suitability is grounded in its modest needs for sunlight and its resilience, mirroring the Earth energy associated with the northeast in Feng Shui. However, these observations should be considered alongside other personal and environmental factors for optimal Feng Shui.

Stinking passionflower aligns well with a Northern orientation, potentially due to its inherent knack for anchoring a sense of stability and tranquillity. It has an amicable relationship with the Water element typically associated with North, thereby fostering balance and positive energy flow. Remember, the interpretation of Feng Shui varies, it's best to listen to your intuition.

The little-leaf buttercup shows a subjective harmony with the southern direction in Feng Shui. Having such a plant in the south may encourage robust vitality, possibly due to the buttercup's lush growth pattern mirroring the element of fire, traditionally associated with the south. However, individual experiences may vary.

The black chokeberry plant holds an intriguing charm in Feng Shui. Its lush dark fruits and verdant foliage vibrate with strong earthy energy, typically suitable for a north-facing direction. The North, in Feng Shui, is associated with water – the very element that feeds the plant – bringing balance and harmony. However, interpretation can vary, mindfulness and personal resonance play a pivotal role.

The strawcolored flatsedge harmonises well with a northern-facing position, due to its ability to symbolise water that is integral to Feng Shui's five elemental cycle. However, personal experiences can vary, making it critical to consider the plant's overall interaction with energy flow in your specific space.

Horse mint is subtly associated with positive energy flow. As the plant's inherent characteristics resonate with tranquility and healing, it's often advocated for Eastern facing areas. This is suggested not due to any empirical evidence, but a reflective response to the plant's vibrant aroma which typically revitalizes dawn energy.