The sunflower plant, symbol of solar Fire par excellence, is considered the crown of Jupiter for the special shape of its petals arranged in a spiral and is particularly useful in Feng Shui applications about greenery. In the Celtic calendar it is associated with the summer solstice festival, Litha.

Sunflower photo by jose poblete from pixabay (Free for use under the Pixabay Content License)
There are three fundamental aspects to consider if you want to try to use the powerful energy of the sunflower in our homes: 1. The position of the plant, which must necessarily face a south-east or south direction; 2. The possibility of growing it in the open ground if a garden is available, or in a pot; 3. The position in the azimuthal astrological chart of the planets Jupiter and Sun.
As regards cultivation there are several criteria to follow, starting from the choice of the cultivar suitable for development in open ground or in a pot, taking into account that the sunflower can reach a considerable height (up to 4 m).

“Sunflowers and yellow pot” by chris.rycroft is licensed under CC BY 2.0.
Other important parameters to take into account for cultivation are irrigation and the type of soil. Since sunflowers prefer well-drained soil and, at the same time, require high volumes of irrigation, you need to have plenty of water available, especially in the summer.
As for cultivation in pots, there are varieties of dwarf sunflowers that are well suited to developing in little soil, although you will always need to take into account the best exposure and irrigation needed for the sunflower.

“Melissa and the giant sunflowers” by nic221 is licensed under CC BY-NC-SA 2.0.
If you want to use sunflowers to balance your home with Feng Shui, you should evaluate not only the exposure, which must be the best possible with respect to the solar cycle, but also the planetary positions of the residents of the house, in order to create a perfect Earth-Sky balance.
In the specific case of birth charts characterized by afflicted Sun and Jupiter, with depressive implications, the greenery remedy with sunflower is particularly recommended.
An renowned example of self-therapy is given by the very wide range of sunflower reproductions that Van Gogh has made immortal in the history of painting. For those who could not enjoy a real alive sunflower in their garden or in a vase, a beautiful reproduction of the many sunflowers by Van Gogh, placed in the appropriate direction according to the Chinese Compass and astrology, could be an equally effective and ever-enjoyable solution.

“Van Gogh’s ‘Still Life: Vase with Fifteen Sunflowers'” by BillDamon is licensed under CC BY 2.0.
The sunflower, which is of American derivation, was an important element of the solar cults of pre-Columbian populations and subsequently imported into the rest of the world. On account of its evident symbolism, it was welcomed by ancient religions such as the Celtic one and also by the world of art and literature: in the 19th century, the Irish writer, poet and playwright Oscar Wilde adopted the sunflower as the symbol of his aesthetic movement.