When the AFP news agency visits him in Amay in eastern Belgium, he is digging up potatoes as small as ping-pong balls.
"Normally they would be four times as big. It's a disaster. I've never seen anything like it," says Comijn.
The reason is an excessively wet spring followed by an extreme heat wave this summer. Fortunately, he and many others have not yet used up the mountains of potatoes left over from last year's record harvest.
The drought still has consequences for quality, price and size.
Apart from illness in the royal family, there is probably no worse news for a Belgian than higher prices for French fries, says Bernard Lefèvre from the trade organization Unafri.
What do you think?