Nigel Heather the-heathers.co.uk> A lot of carnard designs have swept wings.
Most canards have swept wings in the interest of lateral (yaw) stability, and not speed - hence the lower angle of sweep. Note that the moment arm aft of the CG for a canard design is particularly short - which would require a huge fin/rudder (having the rudder ahead of the CG is a divergent configuration).
By sweeping the wings, not only can the designer aid CG location, but can also generate a bit of arm by placing the vertical fin area on the wings - farther out on the span being better. Rutan's Long EZ is another example; vertical surfaces at the wing tips -