I had a neighbor who used them religiously. However I think it wasnt until late May or June when we would get them. We would freeze them then thaw them and bait the trot lines. He said some years they wouldnt get worms on the trees because Theres a moth called a sphinx moth that is responsible for the larvae that make the worm(caterpillar). He used to keep the ground moist and put a light on the tree at night and always had worms and lots of them. I guess in theory it makes sense. Im almost positive its still way too early for the worms. Im pretty sure thay dont emerge untill late may at least. You can buy them on the web just type in catalpa worms. Untill then put a flood light on the tree and see what happens it worked for him. Good luck!!