The cylindric-fruit primrose-willow conveys a sense of tranquility and balance, resonating harmoniously with Feng Shui principles. Ideally situated in the Southeast direction, its elongated form is said to encourage financial prosperity, echoing the Wood element associated with this direction. However, as Feng Shui interpretations can vary, individual experiences may differ.

The star gentian complements the North direction due to its inherent water element attributes. As North corresponds to the water element in Feng Shui, star gentian could potentially enhance the Qi flow in this area. However, bear in mind Feng Shui outcomes can depend on individual perceptions, interpretations and personal environments.

The manila tamarind is moderately compatible in Feng Shui, exerting slight positive influences in certain contexts. Its key facet of enhancing abundance aligns well in Southwest-facing spaces, known to be associated with wealth and prosperity. However, interpretation varies, and one should make adjustments based on their unique circumstances.

The chinese eupatorium plant, with its robust vibrancy and tranquil aura, can harmonize well with the West-facing direction. This harmony stems from the plant's inherent ability to absorb surplus Yang energy, which is often dominant in this direction. However, the synergistic relationship and effectiveness can vary based on individual energy dynamics.

The mapleleaf viburnum stocks an esoteric connection with the East. Its bold and prosperous green leaves invoke a strong Wood Energy, typically associated with the East, promoting growth and renewal. However, one must consider the plant's unique Qi and personal energies for optimal feng shui harmony.

The oregon white oak aligns favorably with Eastern-facing aspects of Feng Shui. As the East symbolizes rebirth and rejuvenation, this plant, renowned for its endurance and longevity, enhances these properties. However, perceptions of Feng Shui may vary; some experts might recommend the plant in alternative contexts.

Black mustard's potent energy ignites the fire element, potentially harmonizing with a house facing South, where Fire is dominant. However, this may amplify existing fiery characteristics, warranting careful consideration. As Feng Shui appreciates equilibrium, one must heed the unique character of black mustard impacting the existing energy balance. Always consult with a Feng Shui practitioner to optimize black mustard's placement.

In the mystifying art of Feng Shui, the candlenut is thought to convey affirmative energy when placed in the South direction. The robust nature of candlenut aligns harmoniously with the Southern energy, traditionally symbolic of reputation and fame. However, as with all aspects of Feng Shui, personal experiences may vary.