. . Blue Gums - the tree from Hell. They grow like a rocket to 40, 50 feet tall. A couple times a year they drop leaves by the cubic yard, toxic leaves (tannin and oils) that stunt the growth of other plants.
They'll stand up to 80 mph winds without losing a twig, then a month later drop drop a 400 pound branch just because they feel like it (not really dangerous 'cause they come down slow cushioned by a zillion small springy branches and the thick end stays attached until the rest is down).
They were brought to California from Australia to quickly grow railroad ties for the transcontinental railroad - but Eucalyptus grows in a spiral and twists as it dries - they soon realized those ties would rip up the tracks in short order.
Someone once told me of a friend of his who built his cabin in the woods out of Blue Gum lumber, then watched helplessly as it twisted itself to splinters.
Oh yeah, almost forgot - fire. Old dried up leaves don't burn real well, but freshly fallen - stand back! Green on the tree - rocket fuel! In cold weather I stuff a grocery bag of fresh raked blue gum leaves in the fireplace. When I get up in the morning I toss in a match - instant warmth!
Rows and rows of blue gums were planted in California as fast growing and durable windbreaks on the farms.
When I moved in here it was rare to see a blue gum leaf that anything had touched - but now the pests have finally made it from Australia and it's now rare to see one not munched along the edges.
The long horned bark beetles finally got here too. Cut a eucalyptus and pile up the logs, soon you'll hear loud munching sounds from under the bark - these are big beetles and they have big grubs. A former employee was afraid to go near the wood pile for all the noise.
NEVER buy a blue gum from a nursury, you grow them from seed. Nursery plants have balled roots and the roots don't escape the ball. They'll grow up about 40 feet and then fall over in a light wind crushing anything in their way. Seed grown trees are good for 120 mph plus at 100 feet and more.