The white buttercup exudes a vibrant balance of energy, acting as a conduit of positive chi. It thrives best when placed in the Southwest direction. This system is attributed to the Earth element in Feng Shui, which matches white buttercup's grounding presence, encouraging stability and balance in your surroundings.

The narrowleaf evening primrose harmoniously aligns with South-facing placements according to Feng Shui principles. This direction, symbolising fire, elevates its innate, vibrant energy, nurturing growth and prosperity. However, the true harmony depends on an individual's unique Qi or life force, hence the interpretation could vary.

The catmint is believed to have a gentle yet strong harmony with the Southwest-facing direction. This proposition stems from Feng Shui principles that associate plants with soft shapes and delicate fragrance, like catmint, as cultivating balance in such placement. Please note these interpretations may vary depending on the full context of your environment and personal Qi.

The panama hat plant displays a harmonious connection with the Center facing direction due to its evenly spread foliage representing balance and stability. This bodes well with the essence of stability that rules the Center in Feng Shui principle. However, nuanced interpretations may vary depending on individual circumstances.

The mexican cypress is recognized for its upright growth, conveying a sense of elevation, and making it suitable in Feng Shui for pursuit of aspirations. Facing East, it may enhance the wood elements' prosperity, as East symbolizes growth and rebirth. However, the interpretation is subjective and may vary.

The gooseneck loosestrife aligns favorably with North-facing positions. This is said to derive from its upward growth, resonating with the symbolisms of North such as growth and ambition. Yet, it's important to note that Feng Shui interpretation is subjective, ensuring varied perspectives on its compatibility.

The old man cactus subtly exudes strength and longevity, a likely ally for a balanced Qi. Placed in the Northeast of one's environment, old man cactus might amplify Earth energy, the dominant element in this direction. However, its impact remains interpretable. Importance lies in the harmony and unique connection you feel with old man cactus.

In terms of Feng Shui, the mexican hens plant aligns harmoniously with a West-facing direction. This is because the direction signifies metal element, which complements this succulent's tenacity and ability to thrive in tough conditions, symbolizing Metal's characteristics. This, however, should be considered a general guideline rather than an absolute rule, as Feng Shui interpretations can greatly vary due to different perspectives and contexts.