My Trees
This is a documentation post:
New Orleans is in USDA Hardiness Zone 9, which means its mean annual low temperature was between -1 and -7 °C between July 1986 and March 2002.
In the front yard we planted three Centennial Spirit crape myrtles (Lagerstroemia indica). According to the tag on the tree, they require full sun, and should be spaced 10 feet apart. They bloom from summer to fall, prefer semi-moist soil and have a medium growth rate. Their average size is 15 feet tall by 12 feet wide. They can tolerate cold down to -23 °C. Damaged limbs should be pruned and fertilizer is best applied, if at all, in the spring and summer. Each of the three 5 gallon plants cost $10. According to the grower's tag (different from the retailer's tag), indicates these plants have a low pollen count. How something that is literally covered in flowers can have a low pollen count, I don't know. The grower was apparently associated with the Texas Department of Agriculture's Go Texan program
In the back we planted two species, a Little Gem magnolia and a Crimson Queen Japanese Maple. The magnolia (magnolia grandiflora) is best in semi-shade, which I guess means shade from a semi? Spacing is 10 feet, it blooms in spring and summer, and prefers semi-moist soil. It has a medium growth rate and it's average size is 20 feet high by 10 feet wide. It can tolerate temperatures down to -18 °C. Little pruning is required and, if fertilizer is used, it is best applied in the spring and summer.
And here's where we come to the one I was concerned about, the Crimson Queen Japanese Maple. My wife and I both like Japanese maples. They're beautiful trees. However, prior to this I've only seen them in Kansas, Maryland, and San Diego. All were mature trees under a canopy of much taller trees. According to Dave's Garden, they are only rated to go down to Hardiness Zone 8b (low temperature: -9 °C) . They also prefer acidic soil and sun to light shade. So, the big question is, do the hardiness zones provide any useful information about planting in the tropics? Surely we don't need to worry about the plant freezing, but could it get to hot? I still don't have the answer to that, but Dave's Garden contributors to provide one point for me: I've probably been overwatering the thing.