The western white clematis plant exudes a radiant harmony that is best synergized with the Eastern direction. This particular alignment is due to its association with growth and renewal, which fits the Feng Shui symbolism of East as the site of sunrise and new beginnings. However, its influence is subtly felt and may alter with different interpretations.

The chaparral yucca meshes well with the energy flow in East-facing spaces. This is attributed to its resilient nature which symbolizes rising with the sun, an Eastern characteristic. However, the unique energy interaction may vary, depending on individual perception and existing Feng Shui conditions.

In feng shui, the brazilian fern tree aligns harmoniously with a Northwest facing direction. This is attributed to its powerful energy potentially enhancing the Metal element dominant in Northwest sectors. However, individual experiences may vary, reflecting the intricate and subjective nature of Feng Shui.

The pincushion moss shares a benign relationship with Feng Shui principles. Its dense, rounded form embodies tranquility and balance, potentially amplifying positive energy. Facing North, the pincushion moss symbolizes water in the Feng Shui Bagua, enhancing career prospects. However, impressions of Feng Shui are highly personal. Thus, engagement with the pincushion moss in a Feng Shui context would differ among individuals.

Resin spurge shares a harmonious accord with Feng Shui principles, subtly enhancing the chi and inviting a sense of tranquility. Aligning the plant in a South-facing direction might help harness the element of Fire due to its intrinsic association with warmth and vitality often associated with this resilient, sun-loving plant.

The spearleaf swampmallow carries a harmonious energy, lending itself to Feng Shui applications. It's especially harmonizing when placed in the North sector, as water element corresponds to North in Feng Shui. The spearleaf swampmallow's growth pattern symbolizes the upward ambition of water, thus stimulating prosperity. However, individual experience may vary.

Japanese tree lilac displays a congenial understanding with the South. In Feng Shui, South resonates with the element Fire. With its splendidly hued blossoms, radiant growth habit and visual warmth, japanese tree lilac subtly magnifies the fiery energy in a harmonious way. However, it's pivotal to recognize the subjectivity of Feng Shui in interpreting these connections.

The pingpong-ball cactus aligns harmoniously with the Northeast due to its sphere-like shape signifying completeness. This direction symbolizes Earth element in Feng Shui, hints at stability and nourishment, which complements the round aesthetics of the plant, contributing subtly to a tranquil environment. As with all Feng Shui indications, personal experiences might vary.