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.

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.

Bush-grass often invites balanced energy due to its tall and serene appearance, fostering a sense of stability, especially suitable for the West-facing sector of a living space. The reason lies in Feng Shui principles, where West is governed by the Metal element, which tends to be nurtured by Earth — the element bush-grass is associated with. However, the subjective interpretations of Feng Shui may vary.

The caucasian fir brings a grounded, constant energy to any space, compatible with the earthly chi of the Northeast direction. The elegant upright stature of caucasian fir symbolizes resilience and steadiness, which align favorably with the Northeast's element - Earth. However, interpretations may vary based on individual perception.

Longbract wild indigo resonates exceptionally well with the energy of the North. Attributed to its innate water-resembling nature, it may invigorate the life aspect of career and path in life, often associated with North according to the Feng Shui Bagua map. However, remember, the essence of Feng Shui lays in balance, and each individual's circumstances will bring about unique outcomes.