On 4/22/2016 7:18 PM, T wrote:
one foot? three feet? six feet? I have my whole back
yard to use.

The goal is to thwart that stupid mold that gets them
every year. (there is no sky watering and I use a water
wand to water right at the root.)
It depends on how big the plant gets. We've had some up close that did
well and some that were three or four feet apart that didn't. Place them
far enough apart that they get plenty of sun all around.