|Can you please explain the difference in growing habits between the two species of pittosporum? (Pittosporum tenuifolium and Pittosporum de tallo negro)|
|Pittosporum tenuifolium is a large evergreen shrub or small tree, erect, bushy, fast-growing when young. The foliage is leathery, glossy, medium green throughout the year. Bell-shaped, honey-scented, dark red to purple flowers appear singly or in small clusters, in late spring and early summer, followed by small, gray-black capsules. Quite a tolerant plant, will stand sandy soil to clay, hot, dry conditions, salt spray and heavy shade. This is a dense evergreen shrub that grows to 25 feet tall. Dark green oval leaves are held on black branches. Dark purple flower clusters bloom in the spring. Plant in sun or part shade, with occasional watering. Seaside tolerant. Average Height: 15-25 feet Width: 10-15 feet
I have no information on a Pittosporum de tallo negro so you may want to check your spelling.
Best wishes with your garden!