Depends how much sugar was left for the blend to eat. You may need to feed it.
What was your SG and your FG before you pitched the Roselare?
BBA Brett Old Ale
Amber IPA; Blood Orange Gose; English Cask Ale
Blackberry Lambic; Plum Lambic; Peach Lambic; BBA Robust Porter; Dark Farmhouse Sour
Brett Tripel; BA Flanders Red; Blended BBA Quad