Hi Bob, i have 2 Corymbia ficifolia which i grew from chiltern seed 5 years ago, 1st year they reached 18 inches and were overwintered in pots in the greenhouse at around 5C. then repotted and in their 2nd year reached about 4 ft..they've been outside ever since in north london. when they got to 8 feet in the biggest pots i had, they stopped growing and didn't look so happy so i took the plunge and planted one out. it took a year to get used to being in the ground, and has put on about a foot of growth this year, certainly looks happier than it's very pot bound sibling. i guess they go down to about minus 3/4 C in my garden on occasion. No idea if they will flower or not. A E.globulus which i sowed at the same time and which initially went into the ground in it's first season made 45 feet in 4 years before my neighbour forced me to remove it. Now that was an impressive tree!