Came across this in my stats today.

Somebody got here by asking Google "what does "memorials preferred" mean?"

It means the deceased or his or her family doesn't want you to send flowers. Flowers you buy at a florist are marked up outrageously at every level before they even get to the florist and as such are a huge waste of money.

Instead, they'd like you to make a donation to the listed organization or charity.

Hope that helps.
John, The Answer Dude.