Watermelon in Salzburg

Salzburg was about 10C degrees cool on Sep 19.
Yet they had a watermelon.
Wonder where it comes from.
10度くらいしか気温がないザルツブルクなのにスイカが。
This water melon had the tiniest seeds I had ever
seen. So that I didn't have to spit them out.
このスイカの種はすごく小さいから、出さなくてもいい。
というか、出すのがむずかしい。