In cold winter climates, grow tibouchina as a container ... a little past the drip line. Mix it into the top layer of soil and water well. Use a product such as 15-9-12 at the rate of 1.3 pounds ...
A more compact variant of red bottlebrush, "Little John" (dwarf Callistemon ... so start with a container from 1 to 2 feet across and plan to re-pot your plant several times before it reaches ...