Plumleaf crab apple is generally perceived to have a harmonious relationship with the East-facing direction. This stems from an underlying belief in Feng Shui that associates the East with growth and renewal, reflecting this plant's resilience and constant rejuvenation. However, one's personal Qi and environment play a significant role in this perceived auspiciousness.

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.

The yellow trillium manifests auspicious vibrations when placed in the Southwest direction. The yellow hue corresponds to the Earth element, which is dominant in this facing direction. It is essential to care for its brightness, signifying the maintaining of balance and harmony. However, the interpretations, like the plant's growth, need time and discretion in Feng Shui.

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.