If you really want to keep track of your plants a bed map is a must. Otherwise, how do you tell what is what if the daylilies are not in bloom. Even then, too many flowers look alike. Sometimes even when they are in bloom you cannot tell. Then there is the challenge of keeping track of any other plants intermixed: bulbs that do not show in the fall when you might want to rearrange things , etc.
Labels are a must, but what about when those "helpful" kids, dogs, squirrels...whatever, remove/rearrange your carefully placed markers? What do you do then? That is when a bed map comes in handy. I have several that I have made over the last few years for the different beds. Some are more elaborate than others. It depended on how energetic I was feeling and how much time I had at that moment.
Here is the most recent one that I finished making. It was easy and only took a day to do. First I went out and made a drawing of the bed, marking where each plant was and noting how many fans I had for each daylily.