The holly olive is harmonious with the East-facing direction, since East represents wood in Feng Shui, and holly olive is a wood element. Its evergreen nature and sharp leaves also add an energetic vibe, conducive for an East-facing environment. However, personal experiences with this plant might vary.

The arrowhead vine is generally considered harmonious in Feng Shui, popular for its positive energy flow. It fits well in the Southwest direction, significantly known to associate with the Earth element. Thanks to the plant's characteristic lush, rounded leaves, it subtly echoes the element's grounding and nourishing nature. Please note that interpretation varies, reflecting personal energy and design preferences.

Airplant is in harmony with the West facing direction. As per Feng Shui principles, this plant's natural uplift complements the metal energy of the West, aiding in fostering clarity and support. Individual experiences, however, may vary.

The whitetop aligns well with the Eastern Feng Shui energy spectrum, due to its strong yang properties. It's believed its vivacious growth promotes vitality and renewal, bringing an energetic presence to spaces, although interpretations may naturally vary. Please remember to consider your personal energies and preferences, alongside Feng Shui principles, ensuring a harmonious integration.

The european honeysuckle is indeed compatible in Feng Shui practice, best suited for an environment facing Northwest. The vitality of its growth harmonically corresponds to the Metal element that dominates this direction. This flexible interpretation advises caution in utilization, maintaining Feng Shui's intricate balance. Remember, perception and application vary by personal experience.

The common groundsel could introduce a harmonizing and homely feel when placed in a Southwest facing direction. This can be partially attributed to its innate affinity for warm, sunny climates. However, its compatibility in Feng Shui may vary per individual, due to the subjective nature of this practice.

In terms of Feng Shui, the bay biscayne creeping oxeye appears to largely resonate with the Southeast direction. This stems from its unique growth patterns, which harmonizes with the Southeast's quintessential wood energy. As always in Feng Shui, individual interpretation and context are key; the bay biscayne creeping oxeye might have varying effects in different settings.

The broadleaf stonecrop harmonizes well with the westward direction. This is due to its sturdy properties which represents strong Metal Element in Feng Shui, an element associated with the West. Yet, its varying compatibility with different environments reexposes the profound depth of Feng Shui, thereby stimulating an enriching exploration.