Museum has gone on and off about attribution, sometimes calling it an autograph work but often listing it as a studio piece. There are no close copies/variants.
According to Fred Meijer, this painting must have been known by Bosschaert by about 1606/7 because he borrows from it in one of his earliest flower pieces. This means that Brueghel's earliest flower pieces were shipped not just to Borromeo but also to Middelburg. Probably for flower collectors there. Bosschaert might have known about this painting in his role as a dealer.
Jan Brueghel the Younger painted variants with a similar glass vase: a copper on panel (18.5 x 24.5 cm) sold at auction (Van Ham Kunstauktionen), May 16, 2008, nr. 377; and one in the Rijksmuseum, Amsterdam.