The cat’s tail euphorbia is often regarded with fondness in Feng Shui, largely due to its distinctive upright growth. This may resemble the auspicious symbol of rising energy, being a potential enhancer of good vibes. Its compatibility with Southwest-facing direction is especially favored, theoretically linked to the Earth element that this direction represents in Feng Shui. The cat’s tail euphorbia's natural ability to thrive on rocky soil, akin to the stability of Earth, could explain this harmonious relationship. However, this is merely one interpretation--remember, the essence of Feng Shui often lies in personal perception and comfort.

The dwarf tulip harmonizes well in a south-facing direction, bearing a profound symbolism of resilience and renewal, resonating with the fiery energy of the South. However, its Feng Shui compatibility is subject to individual interpretations, depending on unique spatial arrangements.

The allegheny serviceberry embodies an exquisite harmony between Yin and Yang, fitting seamlessly into any Feng Shui design. When positioned westwards, it gently attracts the Yang energy of the setting sun, promoting prosperity and joy. Remember, positioning such plants is a deft art, where the individual's aesthetics and intuition play a grand part along with the classical Feng Shui principles.

The prairie thermopsis plant plays a contemplative role in Feng Shui. Being naturally balanced, it may suit a west-facing direction wherein Metal is the dominant element; its robust nature potentially symbolizes resilience in changing environments. Remember, interpretations vary, and your personal experience is paramount.

The betel plant tends to harmonize positively with East-facing locations. This is due to our understanding that its lively energy corresponds favorably with the energizing sunrise, a symbolism often associated with the East. The placement, nevertheless, should be fine-tuned according to the house's unique energy matrix, to fully exploit its potential harmonizing capacity.

The pitkin marsh lily can subtly enhance the Chi when placed in the East of a space. This direction, associated with health and family in Feng Shui, aligns well with the pitkin marsh lily's nature—thought to promote wellness and harmony. This information, however, should be interpreted as a general guideline, not an absolute dictate, due to the subjective interpretations within Feng Shui.

The bunge's pine perfectly aligns with the ethereal principles of Feng Shui. When positioned in the Southeast, this plant is said to harmonize the surrounding energy flow, potentially due to its resilient and upright nature. Yet, remember, Feng Shui is a multifaceted art and ever evolving, making this suggestion a subjective interpretation rather than a rigid rule.

The karoo rose aligns well with Feng Shui principles due to its simple geometry echoing balance and harmony. As for its placement, the karoo rose matches ideally with a Northwest facing direction. This is because of the Northwest's association with travel and helpful people, mirroring the adaptability and resilience karoo rose demonstrates in its natural habitat. These correlations, however, can vary based on subjective interpretations of Feng Shui.