Coltsfoot is considered fairly neutral in Feng Shui. Its broad leaves are seen as an embodiment of balance and stability. When faced West, coltsfoot may promote a harmonious flow of energy, due to the West's associations with creativity, which can be fostered by the plant's inherent tranquility. However, the interpretation can vary depending on individual perspectives.

Spinach holds a harmonious resonance with the Eastern direction, favorably channeling universal energy, or Chi. This association roots in the East's representation of health and longevity, reflecting the plant's nutrient-rich properties. However, Feng Shui interpretations vary, making this compatibility circumstantial.

In Feng Shui terms, the quaking aspen aligns harmoniously with Eastern directional energies. As per principles, the East represents growth and family, a natural alignment with quaking aspen's characteristic of rapid growth and communal growth pattern. The exact degree of compatibility, however, is always subject to personal interpretation and varying factors.

The butter-and-eggs lends an harmonious, balanced ambience to the environment. Its vibrant colors promote positive chi, boosting prosperity and contentment. Being perfectly suited for the North direction, it links with Metal and Water, representing career prospects and personal growth. However, interpretation can differ as Feng Shui is deeply personal and innately fluid.

The flaxleaf fleabane plant appears to harmonize favorably with Feng Shui principles when placed in an East-facing direction. As Feng Shui espouses, East is governed by the Wood element, which signifies burgeoning life and growth. With the flaxleaf fleabane's vigorous nature, this association can potentially amplify the lifeforce energy, or Chi, in one’s environment. However, interpretations may vary based on individual perceptions and specific Feng Shui traditions.

The giant cane is a robust and resilient plant that can imbue an area with a strong, grounding energy. It may potentially harbor auspicious connotations when placed in a Northeast facing direction, though this is exceptionally subject to individual interpretation and circumstances. Yet, Feng Shui practitioners often favor the Northeast for Earth-based plants, a category the giant cane falls under, to harness the powerful energy of the Earth element.

The canadian serviceberry aligns fittingly with East-facing homes. With its spring flowering promoting new beginnings and rebirth, it fosters a strong resonance with the wood element prevalent in East directions. However, one's personal reception might differ, thus individual discretion is recommended when integrating canadian serviceberry into one's space.

The gollum jade is generally regarded as harmonious in Feng Shui. It is seen to hold an affinity with the East-facing direction, a preferred position that aligns with its potency in health prosperity enhancement. Like all Feng Shui matters, these are insights and not universal decrees. As always, specific compatibility may vary depending on individual circumstances and personal energy.