The saffron crocus exhibits harmonious energy when facing South. This direction symbolizes the element of fire in Feng Shui, resonating with the vibrant color of saffron crocus’s flowers, encouraging warmth and passion. However, the true alignment of Feng Shui varies matching individual's energy flow and the environment.

The tropical-crocus is widely perceived as fitting within the Feng Shui practice due to its vibrant, vibrant spherical blossoms, known to induce robust energy fields. North-facing locations are particularly appropriate due to the tropical-crocus's preference for less direct sun. However, its compatibility should be interpreted with consideration for one's specific environment and expectations, maintaining the holistic ethos of Feng Shui.

Cape ivy is regarded to symbolize resilience that, according to Feng Shui, enhances the flow of positive energy. Having it in a Northeast-facing direction is believed to encourage personal growth, due to the Northeast's association with spiritual development. However, interpretations can vary based on individual perspectives.

Yellow pitcherplant aligns well with the Northeast direction, owing to its affinity with the earth element which resonates with the Northeast. Notable for emphasizing grounding and stability, it could subtly improve harmony. Yet, remember, the effect of Feng Shui varies for each individual and dwelling. Knowledge and personal reflection are key.

The smooth brome exudes a positive essence that dovetails seamlessly with a Northeast facing direction. It is generally accepted in Feng Shui that the Northeast is associated with knowledge and wisdom, the fertile energy of Smooth Brome harmonizes with this orientation, potentially allowing for an enhanced flow of beneficial energy, although interpretations may vary.

The mexican olive has a certain harmony with the South, said to foster fame and status in Feng Shui knowledge. Its vibrant blossoms may catch the Fire Element, typically associated with this direction. However, bear in mind that Feng Shui is a complex art, thus its interpretation could vary greatly.

The winter heath is moderately harmonious in Feng Shui, popularly known for its balance of Yin and Yang. Its resilience and vibrancy can stimulate a positive flow of energy, known as Qi. When placed in the Northeast direction, the winter heath's inherent Earth energy is believed to be enhanced, potentially encouraging knowledge and personal growth. Nevertheless, Feng Shui is deeply personal and subjective, these interpretations vary and should be adapted depending on your personal energy and environment.

The hay-scented fern exhibits a harmonious blend with the Northeast direction. Its gentle, flowing form echoes the Earth element, dominant in the Northeast sector, enhancing stability and tranquility. However, perceptions may vary, so it's essential to carefully consider individual connections and responses to the plant.