The fox-and-cubs, with its vibrant blossom, has an affinity for the South-facing direction. This orientation maximizes its exposure to the 'Fire' element, symbolized by the South and accentuated by the plant's vivid hue. Its compatibility, however, remains subjective, deeply rooted in one's personal perceptions of Feng Shui.

The american germander harmonizes with the soft energies of Feng Shui. It ostensibly nourishes the soul, complementing the vital 'Chi' flow beautifully. Its affinity to the East is usually attributed to the plant's delicate persistence, resonating with the resilience symbolized by the Wood Element of this direction. However, as it always goes with Feng Shui, interpretations may vary and individual resonance must be taken into account for a peaceful residential ambiance.

The tropical chickweed harmonizes well with North-facing locations. This is due to the belief in Feng Shui that North is a water element which dovetails with the tropical chickweed's tropical nature. Please remember, Feng Shui wisdom is insightful but deeply personal, and one's connection with a plant may override standard interpretations.

Wild four o'clock, a plant with significant nocturnal blooming frequency, aligns harmoniously with North-facing habitats. The rationale behind this draws from the Water element associated with the North direction, subtly complementing the plant's distinctive nighttime vigor. Keep in mind, Feng Shui interpretations remain subjective and this does not guarantee definitive outcomes.

As per Feng Shui principles, the pennyroyal plant exhibits an intriguing compatibility with a Northerly facing direction. Some practitioners attribute this to its vigorous energy, which aligns well with the direction's potent Water Element. However, remember that Feng Shui's wisdom can be very individual, and one's interpretation is paramount.

The blue porterweed is generally regarded as harmonious in Feng Shui. Its vibrant blue blooms symbolize life and prosperity, which can truly bolster the energy in a North facing area, traditionally associated with career and life path in Feng Shui. However, individual experiences might vary.

The lowbush blueberry has a strong affinity with the East direction, due to its symbolic significance of renewal and growth. The plant’s blueberries signify health and prosperity, aligning with the Feng Shui notion of blossoming wealth from the Eastern energy. However, harmonizing effect varies as Feng Shui is highly personal.

The hoary alyssum subtly radiates a gentle energy. When placed in Western-facing locations, it can promote calmness and clear thoughts, beneficial for the element of Metal associated with West in Feng Shui. However, remember Feng Shui is often subject to personal observation and feelings.