Daniël Seghers, who trained with Jan Brueghel the Elder, specialised in flower still-lifes. In addition to being a painter, he was also a member of the Jesuit order, as you can see from the signature at the bottom left: D.[aniël] S.[hegers] Soc.tas IESV [Society of Jesus]. 1643. Rubens owned at least one work by Seghers, which the order probably presented to him, as Seghers was not allowed to sell his works as a priest.
The vase contains a bunch with a variety of flowers including roses, bluebells, tulips, apple or pear blossom, irises, peonies and deutzia.