The langsat is quite a neutral plant in Feng Shui, its compatibility being neither polarizing nor striking. It is suitable with a North facing direction due to its affinity for cooler temperatures. However, the potency of this directionality is affected by various factors, thus it's advisable to seek professional guidance.

Horse's teeth can harmonize well with a Northwest facing direction. This is often attributed to its robust nature, symbolizing steady growth and resilience similar to the qualities associated with the Metal element dominant in Northwest as per Feng Shui principles. However, this is a general interpretation and may vary based on individual perspectives.

The colorado four o'clock plant is generally amiable with the Center direction, the earth element's realm in the Feng Shui compass. Evoking stability, the plant's robust growth aligns beautifully with the Center's grounding energy, albeit this strikes an ambiguous chord, open to individual interpretation.

The aconite-leaf buttercup is deemed suitably compatible with the practice of Feng Shui. Its robust structure and resilience promise to generate a stabilizing energy, especially when placed in the North-facing direction. Often, the North is associated with water elements and the aconite-leaf buttercup's affinity to moist habitats could harmonize this energy. However, interpretations may vary, affirming the subjective nature of Feng Shui.

The paperbark maple exudes a vibrant energy, making it particularly harmonious when placed in the East-facing parts of a space. The underlying reason pertains to the Eastern direction in Feng Shui, symbolic of family, health and rejuvenation, which nicely aligns with the robust vitality of the paperbark maple. However, as always, personal experiences can vary, so this guidance should be accompanied by personal intuition.

The hazel alder offers subtle harmony in various settings, catering to the symbolic Feng Shui interactions. Ideally suited for Southeast-facing spaces, its energy flow aligns beneficially with this particular direction; a well-accepted norm is that Southeast represents prosperity and wealth, attributes reflective of hazel alder's vigorous growth. Consider keeping the plant in this direction for metaphysical enhancements, though personal experiences may vary.

The tangut daphne is perceived to harbor positive Qi (energy). Geared toward growth and prosperity, it's typically considered compatible when directed towards the South, as South is associated with fire and familiarity in Feng Shui. Yet, one should remain mindful about the plant's placement as Feng Shui's nature is complex and highly individual.

The forked sundew aligns well with the discipline of Feng Shui. Known for its branching manner which embodies vitality and dynamic movement, it can harmonize with the forceful energy of the North. Yet, the plant's compatibility remains a complex exchange of energies, making its impact on personal luck or wealth highly individual. This interpretation may vary, reflecting the subjective nature of Feng Shui.