The great Coneflower demonstrates an intriguing relationship with Southwest-facing areas, primarily due to its robust and dominant form. The vitality of this plant is believed to energize and bring a harmonious balance to those areas. However, as Feng Shui interpretations are largely subjective, further personal evaluation is recommended.

The foxtail Barley is thought to positively align with the Southeast zone of a space. This is credited to its unique formation which readily embraces the growth energy of the Wood Element predominant in Southeast-facing environments. However, remember that subjectivity underlies the interpretation of Feng Shui, and individual experiences may vary.

According to accepted Feng Shui wisdom, the rose myrtle carries a strong life energy, or qi. It makes an excellent match with a South facing direction, possibly due to its vibrant colors reflecting the fiery element. However, the unique interpretation of one's Qi might suggest varying degrees of compatibility.

The vibrant red angel's trumpet harmonizes with the South, embodying the element of Fire with its intense red hue, which promotes reputation and recognition. However, bearing in mind its vigorous growing nature, it's advisable to maintain balance to avoid 'overheated' energy, thus keeping the Feng Shui elements in harmony.

The haworthia Pygmaea fits well within the realms of Feng Shui, especially when placed in a Northeast facing direction. The diminutive size and robust nature of the plant can be perceived to enhance the Earth element of this zone, potentially cultivating sturdy relationships and promoting self-growth.

Wild Indigo holds a special energy, exhibiting a balance of yin and yang, thus symbolizing a harmonious integration of opposites. The plant is moderately compatible with the North-facing direction. The reason for this is its association with the element of water, which, according to Feng Shui fundamentals, serves as an elemental base for the North direction. Yet, it remains a personal interpretation, delicately mindful of the individual's uniqueness in their Feng Shui journey.

The water chestnut aligns well with the principles of Feng Shui, associated with aspects of life abundant in change and instinct. Its placement may significantly contribute to positivity and harmony in a dwelling. Placed in the Southwest direction, it could potentially bolster circumstances linked to relationships and femininity. This connection is attributed to the Earth element, which is strongly associated with the Southwest. Remember, perceptions of Feng Shui can vary widely, ensuring this perspective is among several brought to bear.

In Feng Shui, certain plants like pauper's-tea can subtly enhance the vibrancy of a space. Particularly when positioned to the East, it may encourage growth and renewal, given East's affiliation with the wood element. This is a generalized interpretation and specific results may vary.