The deutzia rubens plant aligns well with the Northwest direction in Feng Shui principles. The Northwest is governed by the element of Metal, and this area in homes or offices is related to father figures, mentors, and travel. As deutzia rubens's soft pink and white blossoms have a grounding and calming effect, they can harmonize with the energies of mentorship and exploration typically associated with the Northwest.

The western blue-eyed grass carries a tranquil energy that promotes peace and optimism. Being a symbol of stability and resilience, this plant resonates harmoniously with the East direction, traditionally associated with health and family in Feng Shui. Its blue flowers, evoking the Water element, can enhance the wood element of the East, fostering growth and renewal. However, individual interpretations may vary.

While the yellow foxglove is known for its vibrant colors, its compatibility with Feng Shui, particularly when facing South, is somewhat uncertain due to its associated elements. Its tall, predominantly yellow form may promote active energy (Yang), fitting with South's Fire element. But, as Feng Shui is a highly subjective discipline, individual interpretations may shape ultimate compatibility view.

The aspen Fleabane plant, due to its robust and adaptable nature, thrives well in Southwest-facing spaces - an expression of Feng Shui's Earth element. The delicate balance of its flowering mechanism coheres finely with the nourishing and stabilizing aspects of the Earth element. However, placement and usage should be done with personal discretion as reactions can always deviate due to different spatial conditions and personal energies.

Schreber's watershield exemplifies a harmonious blend of water and earth elements, suggesting a calming influence. Its auspicious compatibility with a North-facing placement can be attributed to North symbolizing water in Feng Shui, complementing schreber's watershield's aquatic nature. However, as Feng Shui interpretation can be individual-specific, personal preference and specific circumstances should take precedence.

The blue marble tree is generally appreciated in Feng Shui for its robust vitality. Placing it towards the North could harmonize the flow of Chi, considering North is traditionally linked to the water element, promoting wealth and career success. However, adaptability may vary due to its unique energy.

The european alpine primrose plant is moderately amicable with the Southern direction when it comes to Feng Shui placement. The Southern sector, symbolizing fire in the five-element cycle, might harmonize with the vibrant, fiery colors of the european alpine primrose. The tranquil energy exuded by the plant possibly aligns subtly with the robust South, creating a delicate balance. However, an individual's unique connection to the plant and the energy around it might vary, concealing many layers of interpretation and potential benefits in its vibrational spectrum.

The antelope Horns Milkweed symbolizes survival and resilience, making it a fine addition to homes in need of such energies. When facing West, antelope Horns Milkweed may harness the power of descending sun to bring a sense of balance and stability, although results may vary.