The maryland senna is largely in sync with the principles of Feng Shui due to its balanced energy flow. Specifically, it harmonizes well with an East-facing direction, often associated in Feng Shui with health and family. The maryland senna's green hue and vibrant energy may bolster this connection, although interpretations may vary.

The blue-oxalis plant holds a harmonious presence in a North-facing direction, often associated with prosperity and personal growth in Feng Shui philosophy. However, how this translates to the individual's energy flow varies, making interpretation a personal endeavor.

The coastal cholla showcases a natural adaptability, which marks it as inherently compatible with the South direction in Feng Shui terms. This direction symbolizes fame and reputation, something the coastal cholla's resilient nature inherently resonates with. However, as with all Feng Shui applications, personal receptivity and belief remain crucial components for balancing energy correctly.

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 hairy sedum plant is subtly favorable for Southwest-facing locations. In Feng Shui, the Southwest is associated with the earth element. The hairy sedum plant's grounding properties subtly resonate with this, creating a delicate harmony which might stimulate an amiable energy flow.

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.