Citrus and subtropical fruits. Where was the picture taken on pg.12 of olive and tangerine tree. I live in lansing Michigan. and grow indoors olive and citrus The question was can artificial light help the plant. They flower very well, in fall. When winter approach the flowers drop. What Artificial light of 6000K to 2700K combination which will sustain their growth and fruit development .
The picture on page 12 of All About Citrus and Subtropical Fruits was taken at the home of a commercial cherimoya grower just north of San Diego, CA.
Although citrus and olive both can be grown in containers and overwintered indoors in northern climates, olives are much less likely to be productive in indoor containers than are citrus trees. I have excellent results growing citrus in my attached greenhouse; a sunroom or conservatory is also a good option. However, if you lack those possibilities, supplemental lighting can help. Any kind of supplemental lighting can help, but the greater intensity that you can provide, the better. HID (high intensity discharge) lights would be a good choice. Another factor to keep in mind is that the low humidity in most homes over winter and lack of pollinators could contribute to blossom drop. It might be worthwhile to try hand pollination with a camel-hair brush.