The mexican plum finds a harmonious synergy with settings oriented towards the East. This may stem from the Feng Shui principle that East is linked to the Wood element, which signifies growth and vitality - features embodied by this vibrant plant. However, it must be acknowledged that Feng Shui interpretations are not universally agreed upon.

The broadleaf cattail aligns well with the principles of Feng Shui, complementing serene surroundings. Its compatibility with the North-facing direction is attributed to water's dominant element in this orientation, which is synonymous with the plant thriving in wet environments. However, perception of this harmony may vary.

The sea-buckthorn signifies determination and vitality in Feng Shui, appreciation for its ability to thrive even in harsh conditions. It's ideally suited for a North facing direction, connected with the water element. The sea-buckthorn's resilient nature might provide a protective energy against the coldness associated with water, eliciting a certain harmony, though one must remember that each placement can invoke unique responses based on personal and environmental nuances.

Japanese fairy bells carries an innately harmonious balance of Yin and Yang energies, making it quite an adaptable addition to any space. When placed in the East direction, it could promote spiritual growth, mimicking the rising sun's energies. This reflects the Feng Shui principle of harnessing growth and familial well-being. However, one should remember that Feng Shui practices can be uniquely personal and results may deviate according to different individuals' experiences.

The wild poinsettia has a curious interplay with Feng Shui, mildly raising the chi with its fiery hues. As the South symbolizes fame and reputation, this plant may fortify one's social status. But remember, the plant’s prominence should harmonize with other home elements. Feng Shui is a holistic practice; imbalances can disrupt the positive flow.

Brown-eyed susan aligns well with South-facing setups, exuding positivity and balance. As per Feng Shui, its vibrant blooms symbolize the fiery energy of the South, promoting wealth and triumph. However, remember that Feng Shui wisdom and plant preferences vary; one should consider individual surroundings and personal resonances.

In Feng Shui context, jacob's ladder harmonizes well in any environment due to its ladder-like structure. Representing upward growth and progression, it could boost the dynamism of the North-facing areas, often linked with career and life path. This interpretation, however, may vary as Feng Shui practice largely depends on individual perception.

The white heath aster is thought to harmonize well with a West-facing direction. According to Feng Shui, the West symbolizes Metal element, and white heath aster's white flowers echo its purity, subtly enhancing the metallic energy. This creates a calm and serene environment, although, like all Feng Shui interpretations, this may hold different meanings for different individuals.