The red cedar holds a cryptic resonance with the Eastern direction. As the East symbolizes new beginnings, and this tree is persistently renewing its leaves, a synchronous harmony could be hypothetically perceived in the feng shui paradigm. However, an individual's personal chi must also align for optimal balance.

The plain gentian aligns well with the Western Feng Shui directional energy, playing into the notions of contentment and harmony. Its purity amplifies decluttering energy, aiding in creating reflective spaces. Though, as in all Feng Shui practices, the compatibility might vary with individual perceptions and placements.

In Feng Shui, alpine aster symbolises humility and patience, ideal for fostering balance in energy flows. Its compatibility with East-facing directions may be attributed to the dawn's energy they embody, aligning well with the plant's strength to flourish in the early morning light. As always, interpretations may vary, honouring Feng Shui's subjective nature.

In Feng Shui, water tupelo is considered to integrate healing and calming energies, thus deploying tranquility to your surroundings. It aligns exceptionally well with the Southwest direction. The Southwest, in Feng Shui, embodies harmony and relationships, resonating with the serenity that water tupelo exudes. This, however, may vary with individual Feng Shui interpretations.

The hyacinth bluebell dovetails pleasingly with the eastern orientation in Feng Shui due to its lustrous indigo hues. Eastern-facing placement resonates with the element of Wood, nurturing growth and vitality. Note, Feng Shui is multifaceted, and individual circumstances may alter these suggestions.

The northern pin oak plant may harmonize well in an East-facing residence. This Feng Shui compatibility is believed to stem from the plant's robust energy, reflecting the Eastern value for growth and new beginnings. However, as Feng Shui interpretations may vary, it is suggested to consider the plant's integration within the broader context of your home arrangement.

The barbados lily's vibrant blooms bring an energy surge in Feng Shui practice, potentially amplifying prosperity and luck. The plant's compatibility with South-facing directions can be credited to its fiery red flowers, which mirror the attributes of the South-the home of Fire Element. However, it's essential to consider the broader picture and individual circumstances when applying these principles.

The chinese catalpa is an interesting component of Feng Shui design due to its unique characteristics. It particularly complements the Northwest-facing direction, connecting to its symbolism of resilience and growth, a fine representation of the beneficial metal-related energy in Feng Shui that originates from the Northwest. The ambiguity of its influence rests in the fact that Feng Shui believes in personal adaptability, hence the effect may vary across different spaces.