Craig said he expects retail prices to be similar to last year but "the whole thing has been thrown up in the air" following Britain voting to leave the EU last week.
Growers are not setting prices for garden centre customers and Craig set it could be as late as September before currency rates are clear enough for price lists to be published.
Craig, of Garrocher Tree Farm in Newton Stewart, said: "I don't think anyone can predict where prices are going to be."
But he said UK grown trees would be more attractive to buyers because trees priced in euros were likely to be more expensive.
Craig said: "Possibly, the market may firm slightly."
Growers including Cadeby Tree Trust and Jadecliff said they had yet to set prices for this season.