Green amaranth compatibility is considered to strike harmonious tones with Southeast-facing placements. The lush verdant hue of green amaranth may stimulate Wood element energy typically associated with East and Southeast, offering life force prosperity and growth echoes.

The southern maidenhair fern is harmonious with Southeast exposure. This comes from Feng Shui principles, where Southeast represents wealth and abundance. The plant's ability to purify air and ensure good health is an added asset for prosperity. Remember, individual interpretations may vary.

The mountain hydrangea exudes an energy believed to harmonize with the Southeast bound energies. This is attributed to its deep-rooted strength, which in Feng Shui principles, mirrors that of the traditional wood element linked to this direction. However, one's experience may vary as Feng Shui's impact can be subjectively perceived.

According to principles of Feng Shui, kahili ginger is deemed suitable when facing South. This is primarily due to the plant's vibrant, fiery yellow flowers, harmonizing with South's element of fire in Feng Shui philosophy. Still, interpretations differ among practitioners and vary with personal perceptions.

In Feng Shui, the smooth sumac plant is believed to harmonize with South-facing directions, often associated with the element of fire. Its pointed leaves signify the fire element, promoting motivation and success. It's of importance, however, to note the subjectivity in Feng Shui practices and interpretations.

The flame azalea is often associated with fiery enthusiasm and positivity, making it compellingly compatible with Feng Shui principles. Particularly when placed in the South quadrant, it is believed to stimulate recognition and fame because South corresponds with fame in the Bagua, thus reinforcing warmth and illumination. However, the integration of Feng Shui is highly personal and subjective, hence one should trust their intuition about what feels right for them.

The kurrajong plant, in Feng Shui principles, holds a composed and calming energy. This could harmoniously blend with East-facing settings, typically associated with family and health. The kurrajong's growth symbolizes constant evolution in these domains. However, interpretation can greatly vary, and practitioners must consider their unique circumstances and intuitions.

Due to its rich symbolism in Feng Shui, rock soapwort aligns well with spaces that face Southwest. The plant's vibrant colors embody the earthy and fiery elements, resonating with the Yin qualities of this direction. However, the interplay of these facets may vary based on the specifics of the environment.