The silver Dollar Plant aligns well with Feng Shui principles considering its round leaves, signifying completeness and unity, highly favorable for harmony. It is harmonious with a West-facing direction, typically associated with joy and one's children in Feng Shui, mirroring this plant's capacity to foster growth and happiness. Remember, Feng Shui interpretations can vary, and personally resonating with a plant may hold more value to some practitioners.

In terms of Feng Shui, the vanhouttei Spirea plant serves as a remarkable enhancer of positive energy when positioned towards the Southwest. This auspicious match is attributed to the sturdy and flexible nature of this plant. It represents growth and adaptability, essential qualities linked with the Southwest, which is tied to love and womanhood in Feng Shui. However, placement should be adjusted according to personal interpretations and sensations.

The littleleaf mock-orange plant is generally considered neutral in Feng Shui principles, inviting neither excessively positive nor negative energies. It may elicit an air of tranquillity, which is helpful in balancing a space. When placed facing South, littleleaf mock-orange could attract mild Yang energy due to its sturdy and vibrant demeanour, which can help improve vitality and zeal in the Feng Shui context. Nonetheless, individual results vary and should be interpreted cautiously to respect the essence of Feng Shui philosophy.

The wavy-leaf soap plant exhibits a balanced energy, making it generally adaptable in Feng Shui practice. Its waviness signifies flexibility, a vital trait encouraging harmonious chi flow. Placing wavy-leaf soap plant to face the North direction could evoke a sense of tranquility as the North relates to water element in Feng Shui, a calming energy that synergizes well with the plant's fluid-like structure. Yet, the effect may vary, as Feng Shui is a subjective field influenced heavily by personal energy and interpretation.

In Feng Shui, the vine-like moonlight cactus can indeed yield a harmonious blend of energy when placed in a south-facing direction. The plant's growth tendencies align with the Fire element associated with South, promoting growth and prosperity. However, Feng Shui is a personal journey, and these interactions may vary in different environments.

Chinese forget-me-not favorable compatibility with Northern-facing areas mirrors Yin properties of this direction. With North symbolizing water in Feng Shui, this plant's inherent nurturing and persistent energy resonates harmoniously. However, interpretations may vary according to individual spatial arrangements, demanding a discerning approach for the most auspicious results.

Turk's cap aligns harmoniously with the Southwest, traditionally linked to love & relationships due to Earth element dominance. This plant’s vibrant green colour harmonizes well with Earth energy, subtly increasing relaxation and positivity. Nevertheless, Feng Shui interpretations may vary and personal perceptions are equally critical.

The crinkle leaf plant mirrors exceptional Feng Shui compatibility, given its unique crinkled leaves. It tends to harmonise the energy in Southwest directed spaces. As the Southwest symbolizes Earth element in Feng Shui, and earth nourishes plants, this successful integration could be described.