Botanical Plants as Navgraha

Peepul tree as Jupiter or Brahaspathi

As mentioned earlier here is a write up on the Botanical plants for navagrha and their effects, on humans.

Sacred Herbs
Arka Plant / Milkweed Plant (Sun)
"Arka Bhasma" is used in the talisman that is made for maintaining the effects of the placement of Sun in the horoscope. If Arka Bhasma is used when the Sun is placed well in the horoscope, it leads to dignity, leadership, confidence, power and nobility. The individual is a strong, compassionate, pious, well read and leads a happy life.
When the Sun is ill placed in the horoscope, it leads to low self esteem and energy, lack of confidence and negative results in life. Arka Bhasma nullifies the malefic effects of the ill placement of Sun.

Palasha Plant / Flame-of-the-forest Tree (Moon)
"Palasha Bhasma" is used for maintaining the effects of Moon on the horoscope. If the Moon is well placed in the horoscope, the use of "Palasha Bhasma" leads to good habits, stable life and health and the individual is hard working, wealthy and well respected.
If the Moon is ill placed in the horoscope, it leads to depression, hypersensitivity and stress which are removed by the use of "Palasha Bhasma".

Pippala Tree / Peepul Tree (Jupiter)
"Pippala Bhasma" is used for controlling the effects of Jupiter. When the Jupiter is well placed in the horoscope, the use of "Pippala Bhasma" leads towards spiritualism, caring, optimism, faith, good judgment and the individual is blessed with power and respect.
If the Jupiter is ill-placed in the horoscope, it leads to unhappiness, selfishness, egotism, sloth and greed and all these bad effects are removed by the use of "Pippala Bhasma".

Durva Grass / Bermuda Grass (Rahu)
"Durva Bhasma" is essential for controlling the effects of Rahu. If the Rahu is well placed in an individual's horoscope, it leads to inspiration, originality, insight and uniqueness. The use of " Durva Bhasma" makes the individual wealthy and fortunate.
If the planet Rahu is ill placed in the horoscope it leads to paranoia, addictions, mental ailments, stress and troubles. The use of "Durva Bhasma" removes such bad effects of Rahu.

Apamarga / Prickly Chaff Plant (Mercury)
"Apamarga Bhasma" is ideal for controlling the effects of planet Mercury. If Mercury is well placed in the horoscope of an individual, it leads to rationality, wit and dexterity. The use of "Apamarga Bhasma" makes an individual happy, educated, fortunate and highly respected.
If the Mercury is ill-placed in the horoscope, it leads to lack of concentration, speech and hearing impediments, lack of vitality and lack of communication. The "Apamarga Bhasma" leads to a removal of these malefic effects of Mercury.

Audumbara / Doomar (Venus)
"Audumbara Bhasma" is used for maintaining the good effects of planet Venus. If the placement of Venus is good in the horoscope, it leads to attractiveness, grace, elegance and long life. The use of the "Audumbara Bhasma" makes an individual refined with humanitarian qualities.
When Venus is ill-placed in the horoscope, it leads to vanity, corruption, lack of taste and refinement and ageing and the "Audumbara Bhasma" is used to remove these effects of Venus.

Kusa / Sacrificial Grass (Ketu)
"Kusa Bhasma" is used for controlling the effects of planet Ketu. If Ketu is well placed in the horoscope of an individual, it leads to spiritualism, sensitivity and high intuitive powers. The use of "Kusa Bhasma" makes the individual wealthy and protected against evil.
If the Ketu is ill-placed in the horoscope, it will lead towards eccentricity, irrational behaviour, fanaticism and addictions like gambling and fatal diseases such as cancer. To remove these effects of Ketu, "Kusa Bhasma" is used.

Shami Tree/Prosopis (Saturn)
"Shami Bhasma" is used to control the effects of Saturn (Shani). If Saturn is well placed in the horoscope, it leads to discipline in life, responsibility, humbleness and if "Shami Bhasma" is used by the individual, he has a long life, is charitable and proficient in every work.
If Saturn is ill placed in the horoscope, the individual suffers from depression, anxiety, fear, loneliness and disorders of the nervous system. "Shami Bhasma" is used for removing these bad effects of Saturn.

Khadira/Couch Plant (Mars)
"Khadira Bhasma" is used for controlling the effects of the planet Mars. If Mars is well placed in the horoscope, it leads towards positive energy, strength, courage, passion, and aggression. The use of "Khadira Bhasma" makes the individual energetic, learned, well known and noble.
When Mars is ill-placed in the horoscope, it leads to anger, irritability, instability, aggression and the individual is prone to high blood pressure, anemia, and impurities in the blood. The "Khadira Bhasma" is used to counteract these bad effects of Mars.

As mentioned the above plants are planted outside the temple garden, the plant which represents Sun will be in the middle and the other plants planted on the four sides of the Arka milky plant.