The disciples . . . brought the donkey and the colt, placed their cloaks on them, and Jesus sat on them.
A very large crowd spread their cloaks on the road,
while others cut branches from the trees and spread them on the road.
"Hosanna to the Son of David!"
"Hosanna in the highest!"
When Jesus entered Jerusalem, the whole city was stirred and asked, "Who is this?"
The crowds answered, "This is Jesus, the prophet from Nazareth in Galilee."
From Matthew chapter 21
These days, we get our palms for Sunday's processions from a Church Supply Company. In days past, when that was not possible, branches were obtained locally. Palms may have been prevalent in Jerusalem, but what was one to do in Poland, or Scandanavia, in Russia, and other northern climes. I'd never thought of it till my daughter-in-law, who is from Siberia, told me of Palm Sunday celebrations in her parish there. You can find the answer in my Palm Sunday post from two years ago.