The titan arum harbors a remarkable energy, sometimes cryptic in Feng Shui terms. Situating it in the Southwest direction could bring strong, transformative influence. This placement coincides with the Earth element of Southwest, potentially amplifying the titan arum's commanding presence. Bear in mind, the interpretation of this harmonization varies with individuals and perspectives.

The lasia shows a reasonable harmoniousness when positioned in a southwest-facing direction. The plant's spiky leaves echo the sharp, masculine energy, or 'Sha Chi', typically associated with the Southwest, in Yin-Yang theory of Feng Shui. This could bestow a certain balance, albeit subjective, to the energies within that space.

Dwarf ambulia harbors a subtle energy that aligns well with North-facing sectors. This is primarily due to its water-loving nature; as Water is the feng shui element associated with the North. Nonetheless, individual reactions to dwarf ambulia can differ, respecting the subjective nature of Feng Shui.

The pong-pong plant exhibits ambiguous compatibility with North-facing placements. Its strong growth characteristics can be associated as symbolic of enduring strength and prosperity that resonate well with the North's Water element in Feng Shui theory. However, specific layouts and other environmental factors may alter this compatibility.

The white squill has a balanced nature that aligns well with the energy flow of a Northwest-facing setting. Its white blossoms, indicative of purity and tranquility, complement the metal element dominant in this auspicious direction in Feng Shui, thus encouraging harmony and prosperity. Yet, as with all Feng Shui principles, personal circumstances and interpretations may influence this plant's impact on one's surroundings.

The allegheny-spurge adapts well in the East-facing direction. Its alluring green leaves symbolize Wood Element in Feng Shui, which naturally thrives with the sunrise. However, interpretations can vary, and one must balance this aspect with the unique energy flow in their surroundings.

The alpine leek harmonizes well with the Southeast direction, which in Feng Shui, is governed by the element of Wood. Its lush greenery emulates the energy of growth, while its tall stalks seemingly reach towards the southern winds, creating a sense of harmony and balance in the space. Hence, alpine leek could invite prosperity and vitality when positioned in Southeast. However, individual experiences may vary as Feng Shui is highly personalized.

The earleaf bellflower aligns consistently well with southern facing aspects. This relationship is due to its innate essence of radiating vibrant prosperity, a trait complementary to the fiery energy attributed to the South in Feng Shui practices. However, its true potential can only be unlocked in harmonic environments that respect Feng Shui's multifaceted nature.