I've been doing nestboxes for years, and I would suggest REMOVING everything you can from the inside of a box. Primarily, insects like blowflies might breed and accumulate in any vegetation.
Why take a chance?
-----Original Message----- From: Cynthia Burkhart <000000990b36e23b-dmarc-request...> To: WV-BIRD <WV-BIRD...> Sent: Tue, Feb 13, 2018 1:23 pm Subject: Nesting box question
Last fall, after cleaning out all our nest boxes, I put a bit of dry hay/ grass in each box, as suggested in BirdersDigest. Now I'm wondering if I should remove that material before nesting season begins? Any ideas? Thanks, Cynthia Burkhart Ritchie County, WV