The common globe amaranth is deemed to have a harmonious relationship with the South facing direction, attributed to its vibrant colours that resonate with the element of Fire, predominant in the South. However, the effects may vary contingent upon diverse personal and environmental factors.

Foxtail fern is considered favorable in Feng Shui due to its lush, gentle fronds that signify growth and vitality. It can harmonize with an East-facing direction, as the wood element governs this orientation, reflecting the plant's inherent energy. However, it is crucial to evaluate your individual environment and circumstances to determine its compatibility and effectiveness.

The japanese Iris is thought to be moderately harmonious in a southern-facing direction. According to Feng Shui principles, its strong and slender growth mirrors the energy flow of the South, signifying recognition and fame. These correlations, while broad, effectively shape the japanese Iris's compatibility with this direction. Remember, the actual success does hinge on your personal energies and intent.

The australian tree fern displays Feng Shui affinity when exposed to the East direction. Eastern exposure symbolises family connections and health, two aspects australian tree fern naturally enriches due to its lush, vibrant foliage and resiliency. However, these virtues should be contemplated with subjectivity, as Feng Shui principles may differ individually.

The poisonbulb plant is often considered potent in Feng Shui practice, hence offering it a place in the Western facing part of the house is believed to energize the surroundings. This is subject to interpretation and may vary in different Feng Shui traditions.

Angel's trumpet is often favored in Feng Shui practices for its harmonious energy which is said to influence serenity and insight. Moreover, it potentially aligns well with the Northwest direction, as this is typically correlated with travel and mentor luck, meanwhile, the plant's distinctive blooms symbolize guidance and transition in life.

Despite giant ragweed's high growth potential, its compatibility with Feng Shui is rather nuanced. Although highly self-sufficient, the vitality of giant ragweed potentially could clash with Northeast facing locations. This arises from Feng Shui principles that indicate the Northeast corresponds to personal growth and cultivation, which could be overwhelmed by the plant's vigorous nature. As always, the harmony of Feng Shui is a matter of personal sensitivity and harmony.

The broadleaf wild leek seems to harmonize exceptionally well when placed in the Northeast direction. This is primarily due to the primal life-energies emanating from its broad, verdant leaves that align auspiciously with the Earth elements intrinsic to the Northeast. Please note, however, that the highly subjective nature of Feng Shui invites differing opinions on this matter.