The hoary verbena is believed to harmonize the energy dynamics in a Feng Shui setting when positioned in the southwest direction. The hoary foliage may potentially mirror the element of Earth associated with the Southwest, promoting balance and stability. As Feng Shui effectiveness is subjective, individual experiences may vary.

The white kopsia may have uncanny relevance when paired with a West-facing direction. This position corresponds with metal energy in Feng Shui and is said to harmonize with this plant's robust attributes. However, it's essential to remember that Feng Shui's art is highly personal and can vary significantly based on individual perceptions and experiences.

The large-leaved aster is reasonably harmonious with North-facing directions. Its substantial leaves symbolise a grounding force in Feng Shui, encouraging stability and tranquility. For those seeking a certain balance in their northern quarters, this plant might resonate effectively. However, Feng Shui interpretations tend to vary, making this perspective but one of many.

The african lily is a tasteful addition, hinting at the delicate rhythm of nature. It harmonizes well facing North, believed to resonate with its intrinsic Water element. This promotes stability and encourages tranquility. Still, personal experiences may differ, for Feng Shui is a subtle and subjective art.

Little Gem is thought to harmonize particularly well with Southwest-facing areas. This is based on Feng Shui's Five Elements theory, where this plant's earthy tones are believed to augment the Earth element naturally dominant in Southwest. However, every living space is unique and requires a customized Feng Shui solution.

From a Feng Shui perspective, the hooker's mountain-avens is ideally matched with a Northeast facing direction. This is because, in Feng Shui, the Northeast symbolizes knowledge and self-cultivation, energy facets that the hooker's mountain-avens is believed to resonate with. However, keep in mind that interpretations of Feng Shui vary, and personal context should always be considered.

The smooth rupturewort is believed to harmonize quite well with a West-facing direction. This is primarily because, in Feng Shui, West is linked with metal and fall season, which symbolizes transformation and letting go. These attributes echo with the smooth rupturewort's ability to endure tough conditions and its desire for ample sunlight. However, this remains subjective to individual experiences and interpretations— a key principle in Feng Shui.

The purplestem aster aligns harmoniously with the elements of Feng Shui given its vibrant hue. Particularly in the Northeast, the purplestem aster may enhance spiritual growth, alluding to the earth element representative of this direction. However, it's important to consult with a Feng Shui practitioner for placement in individual circumstances, given the inherently personal nature of such energies.