We got a big pile of green christmas trees here at the Home Depot on Josey and Forest. If anyone needs some, come get em. On the 7th of this month, the City of Dallas is gonna come by and pick em up and take em to their mulch makers! They are there for the taking, come get em! I have used christmas trees for years to set out for crappie and they work great. As far as how many, i have used as few as 1 in a tight area, and as many as 4 in a bigger area. I weight them down with cinder blocks, at the trunk, and lower them so they stand upright, once that cinder block settles into the bottom, it's not going anywhere.
Had the brickyard on Bachman wall to wall with christmas trees once upon a time, and the crappie fishing in winter was phenomenal. Then the Skul crew coaches found out about em, and grapple hook pulled em out. Said they were a hazard to their rowing skulls. Funny how a tree 12 ft below the surface can damage one of those aluminum or fiberglass tubes.
Nice guys they are!