If they're in pots, at that size there's probably not a lot of difference. In transplanting you have to cut off a lot of roots, and obviously a larger plant will have longer roots so more damage. For potted plants you don't need to cut the roots. If they're in the ground it could depend on how long they've been there and what kind of soil they're in.

They are not in pots, i don't know how long they have been in the ground. So do you believe the 0.80 is better than 1.20?

I think 80 cms would be safest. Are you going to dig it out yourself?

Ok. Yes i will do it myself :)

Good luck with it.

Thanks. I hope it will survive and grow well. I don't know what zone is my location here in Greece, but i have a lot of olive trees here (it's not the hardiest-type olives). Do you think olives in general are hardiest than canary palms or they have the same hardiness?

I don't really know, neither of those are grown where I live. It would depend on where you are in Greece. This link might give you a bit of an idea. But remember, there are "microclimates" where it might be warmer or colder than the surrounding area. If you're near the coast you shouldn't have any problems: Europe

Ok, no i am not near the coast, but according to the link my location categorized as zone 10. So it should be ok. I will also take note of the microclimates as you said, and i hope all goes well. Maybe i will upload some pics in the future.

Thanks too much for your help!

If you're in the bottom of a valley, or at the foot of a mountain then you'd likely be colder as cold air sinks down to the lowest point. If you're in a city it could be warmer, the "heat island effect" from houses and cars. Plus the concrete everywhere and bitumen in roads heats up during the day and releases the heat slowly during the night. Horticultural zones can be quite a complicated subject.

Yes, it's not that simple with hardiness zones, i plan to plant it to my village next to my house so it will bock the northern winds, there is also a street lamp in this place that lights directly to the spot i will plant it. (it may hold up the temperature a little bit in the night).

But what happens in the case the palms have grown in pots, ( i found a supplier that claims his palms have grown in pots), so i guess i can buy the biggest without the problem of transplant shock, right?

That can also depend on certain factors. If the larger palms have been in pots a long time they might be root-bound, with all the roots tightly packed and twisted around each other. Those can take a while to sort themselves out when planted in the ground before the palms themselves start to grow again. This is less likely with smaller palms, if they have a lot of room for the roots. When put in the ground they don't take so long to sort themselves out and will sometimes start growing again sooner. That's where you can get the situation of a smaller palm growing faster than an older/larger palm. But that's more likely to happen when there's a big difference between the small and the large palms.

Ok, i understand what you mean, i will choose a medium to small sized then.

You've helped me a lot, thank you so much!

Coincidentally, just last night I saw a poster with large Canary Island Date Palms, it was a photo taken in Dodecanese Prefecture. I'm guessing that's not where you are.

No, Dodecanese Prefecture is a group of islands in southeastern Greece, very close to turkey. I live in southern Greece in a peninsula.

In the islands there are a lot of canary palms, as and to the rest of Greece, but in my location probably i am the first one to try to plant a canary palm!