Why Won’t Solanum Rantonettii Bloom?

Question

Hi: My Solanum rantonettii has thrived in the ground in full sun in Houston (zone 9a) for about ten years but never blooms. I’ve tried various fertilizing regimens including low nitrogen and no fertilizer at all. It reaches about six feet every year, even after a hard pruning in spring. The leaves are healthy, and there are no pests or disease problems. The soil drains well, and the plant rarely needs supplemental water. What can I do? Thanks for your time and consideration!

Answer 1

It may not be getting enough water. These trees need regular watering to keep the soil moist. Try adding a 2-inch layer of compost in the spring for the fertilizer. The shrub also performs best in frost free areas, so you may need to cover it when frost threatens.

https://www.gardeningknowhow.com/ornamental/shrubs/potato-bush/potato-bush-information.htm
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=30927

A soil sample analysis may help determine what is missing.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm