The heath spotted orchid aligns well with Feng Shui principles, granting harmonious energy flow when positioned North. This is likely due to its cold-hardiness, reflecting the Water element associated with North. However, the balance may vary depending on personal Chi and other room elements.

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.

The giant reed is symbolically harmonious for a North facing space, though its affinity may be subjective. Its robust structure and speed of growth may mirror rapid progress or strong resilience, desirable features in Feng Shui. However, careful placement is suggested due to its strong energy flow.