Greenstem forsythia is subtly harmonious with Feng Shui principles. Placed in the South, it cultivates growth, symbolizing strength and vitality. The plant's lush green hue enhances the Wood element, which fuels the Fire element dominant in the South, thus keeping a healthy balance.

For the common sassafras, it's seen to blend harmoniously with the East-facing direction. The reason being, its lush and flexible characteristics chime well with the wood element associated with East in Feng Shui, symbolizing growth and dynamism. However, perceptions could differ based on personal experience and interpretation of Feng Shui principles.

The meadow buttercup plant aligns favorably with the South direction. As per Feng Shui, South represents fame and recognition, syncing with the meadow buttercup's vibrant yellow flowers symbolic of sunlight and prosperity. However, its interpretation might change with individual analysis, given Feng Shui’s flexible nature.

Mealycup sage is considered to harmonize well in spaces with an East-facing orientation. Its vibrant flowers symbolize growth and prosperity, while the plant itself is said to balance the Wood element, which is associated with the East direction. As a result, mealycup sage may create a sense of balance and positive energy within such spaces.

Spineless yucca is a popular choice for Feng Shui enthusiasts due to its potential to bring stability and growth into spaces. When placed in the East-facing direction, it could encourage family bonds and health, since the East signifies the Wood element and familial connections. However, individual experiences may vary.

The echeveria runyonii in Feng Shui is viewed as a versatile plant that harmonizes with various energy flows. It is particularly compatible with a South-facing environment. The reason for this is the plant's inherent fiery energy, synonymous with the South's element in Feng Shui. This perfect match can enhance the Chi in the living area. However, the outcomes could vary depending on individual interpretations of Feng Shui principles.

The japanese skimmia's impressive foliage may harmonize with Southeast-facing spaces, known for their association with the element of wood. This Feng Shui principle suggests a potential enhancement of growth and renewing energies. However, individual experiences may vary, respecting Feng Shui's subjective nature.

The yaupon exhibits an intriguing affinity for the South direction, likely due to its inherent fire element properties. According to Feng Shui principles, it's often seen as enhancing the area's dynamic energy flow, fostering balance and prosperity. However, it's essential to consider the individual aspects of each unique environment.