There used to be some decent sized ones over at the UT Gardens, but a cold winter killed them. I think they may have a small one now, but it's nothing to have a picnic under. Only a few types of Eucalyptus stand a chance of survival here in Knoxville, and even those few are very marginal. In a protected location, they may be "doable". Of course, such a protected location (near a building, etc) may not be the best backdrop for a picnic.

allison, three eucalypus species were planted in the UT trial garden some 10-15 years ago. I do not remember the species names of all three, but I do know that single tree that has survived and is doing well is E. neglecta. Based on the lowest winter readings here in Knoxville, the species has seen at least 5 degrees with no apparent damage. It appears to be one of the slower growing species and I am guessing that it is not one of the larger eucalyptus; it is currently about 20 feet. My guess is that it is probably growing about a foot and a half a year. In regards to finding the tree in a local nursery, I have yet to see it. I have, however, been requesting it at multiple nurseries in the Knoxville area. Hopefully someone may eventually find a supply of the species and introduce it to the area. My recommendation would be to find the species through a mail order nursery and order it. Look for Eucalyptus neglecta.