Answer: Solanum Rantonnetii 'Grandiflorum', the Blue Potato Bush, is probably what you're growing. It's sometimes classified as Lycianthes rantonnei, or Paraguay Nightshade. It's generally grown as a shrub but can be staked into a tree form. It's evergreen in mild winters, deciduous in colder areas. The bright green oval leaves are about 4" long and the plants is covered with violet blue, yellow-centered, one inch wide flowers throughout the warm months. You can prune and train your tree in spring and again in fall to correct errant growth and keep it in the form you desire. Remove misplaced branches and cut back those that are too long. It's a vigorously growing plant so you won't hurt it by cutting it back. Best wishes with your blue potato tree!
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