They will get mature heads of from 4' to 10'. Pick an average of around 8' in diameter. If you want them to touch, plant them 8' apart. Closer than that and you have fronds banging into each other. If you want them for shade value, then put them closer. I would price out fully-booted ones just out of curiosity. They do look better than the clear trunks unless you plan on growing stuff on the trunks. I did a job in Ft. Lauderdale where we tied staghorn ferns all around the clear trunks of five existing Sabals on the property. That was 7 or 8 years ago. I would imagine by now they have fully wrapped themselves and expanded.

While I've never grown them myself, Christmas Palms will start themselves if they roll under the mulch after falling off the tree. My neighbor has dozens of volunteers in the ground from his palms. Last week I yanked a Spindle Palm volunteer that was growing up between the bromeliads planted below it. (Don't worry, I didn't toss it out. Saving it for whoever wants it at the Swap-a-Que.) Queens, Robellenii, Washingtonias, all seem to pop up without any help from me. I must have a dozen Licuala spinosa from seeds that ripened and fell. And don't get me started on Arecas. I know the nurseries all use specific techniques, depending on the palm. But for home growers, just plain dumb luck seems to be the best route to follow.

Hi, I have double-posted my question. It was answered on the other post. Thanks! Marbree Here is a link that might be useful: Great Lakes Gardening Forum: How do you grow Winter Hardy Palm trees in zone 5

If you can identify the type(s) of palms you have and figure out their binomial (two-word) Latin name, you can research on line, and get a better feel for the conditions of their origin, and base your watering schedule on that information. for example, Queen palms (Syagrus romanzoffiana) are native to humid and frost-free parts of tropical and subtropical South America. They resent our low desert's dry air, and suffer a lot of damage in winter freezes. Grown in our desert environment, so dissimilar to the conditions of their origin, they look unhappy much of the year. Nothing quite equals their grace, but they just aren't aren't a very good choice for Arizona. If you want those big arched leaves (as opposed to fan palms), a good choice would be a date palm (Phoenix dactylifera), as they originate in a climate more similar to ours, although they are an oasis plant, so they will need irrigation. Good luck with whatever kind you have.