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 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.

The polka dot begonia is a remarkable addition to any space when considering Feng Shui principles. Known for its vibrant and attractive foliage, it is compatible with the South-facing direction. This is due to its elemental association, which harmonizes well with the stimulating energy of the Fire element found in the Southern sector, enhancing potential for growth and prosperity. However, bear in mind that this compatibility may vary based on individual perspectives and other aspects of your environment.

Jack-in-the-pulpit exhibits an intriguing compatibility with Eastern facing directions. This propensity is influenced by the plant's inherent energy that resonates vibrantly when bathed in morning sunlight, a characteristic feature of Eastern exposure. However, remember that interpretations of Feng Shui can be highly personal and subjective, the final harmony is left to the discretion of the observer.

The spiny pincushion cactus exhibits moderate compatibility with Feng Shui principles. Particularly, its spiny exterior emanates a protective energy, suitable for the defensive chi energies when placed in the Northeast direction of a space, traditionally associated with knowledge and growth in Feng Shui. However, individual interpretations may vary.