The green carpetweed harmonises notably well with North-facing locations. This reflects its affinity for water – a characteristic element of North in Feng Shui tradition. However, in the nuanced world of Feng Shui, personal interpretations may vary and the green carpetweed's energy could blend diversely with the surrounding chi.

Coffee senna encapsulates an intriguing blend of energy, noted for its potential to stimulate growth and ambition. It is harmonious when facing Southeast, a direction associated with spiralling chi—an essence known for its wealth-attracting capabilities. Remember, coffee senna's Feng Shui compatibility can differ based on personal chi flow, thus every interpretation should be considerate of individual circumstances.

The bush slipperwort harmoniously aligns with the Western direction, perhaps due to its inherent stability and grounding vibrations. In Feng Shui, West is believed to signify metal energy and the setting sun, potentially enhanced by bush slipperwort's robust biology. However, individual interpretations may vary.

The annual mallow is an acceptable choice in Feng Shui when placed in the Northwest. The plant's inherent yin (feminine) energy is poised to embrace the metal element, predominant in the Northwest, establishing a passive equilibrium. However, the influence of personal energies cannot be disregarded, as balance is vital in Feng Shui.

The kapok tree is associated with elements of earth due to its deep-rooted nature. Placement in the Northeast, representing spiritual growth in Feng Shui, is deemed harmonious. The kapok tree's sturdy roots symbolize grounding, complementing the personal growth and self-refinement principles of this direction. However, these interpretations remain subjective, varying according to individual perceptions and belief systems.

The penwiper plant is considered harmonious in Feng Shui context, resonating gracefully with the energy of self-growth and tranquility. Its compatibility with the Southwest facing direction is significant, as this direction is associated with elements of love and relationships, both of which the penwiper plant subtly supports by imparting a calm and peaceful energy throughout the environment.

The colorado blue columbine aligns well with Feng Shui principles. Its vibrant hue and delicate, inviting nature promote serenity and balance. Placing colorado blue columbine in a West-facing direction magnifies its tranquility, associated with Metal element in Feng Shui. Metal cultivates determination and resilience, essential energies that colorado blue columbine helps foster within an environment. The interpretation is subjective and adheres to the flexible nature of Feng Shui philosophy.

False aster and East-facing properties seem to intertwine harmoniously in Feng Shui. Being a fall-blooming plant that traditionally associates with the harvest - a key period that hints at the energy of growth and prosperity, it mimics the vibrant energy that the East represents. However, keep in mind that Feng Shui provides broad guidelines and each space deserves a uniquely balanced approach.