Persian Lilac (Syringa persica): Generally smaller, with pale lilac to white flowers. Dwarf Korean Lilac (Syringa meyeri 'Palibin'): Compact, suitable for small spaces, and highly fragrant.
There are many dwarf and miniature varieties of pittosporum ... It is best to use planting that has similar growing requirements, such as lighting and watering needs. For example, growing lilac shrubs ...