Necessary to dig up daffodils every year?
I'm new to growing bulbs, and I've got about 20 daffodil bulbs I got a garage sale for just a few dollars. A few were light weight and "dude-like" but most are hefty in weight, and I just get the sense that they're going to be beautiful. The seller said they were "mixed yellow" whatever that means.
I'd like to plant them in the front yard which faces east. My question is why should anyone dig up their daffodils after the foliage dies down? Is it because it gets too hot? Why not just leave them in the ground? If so many people dig them up, there must be a reason, but I can't figure it out.
Any other daffodil advice for a newbie is welcome too!