I unbend a wire hanger with pliers and cut it into six inch pieces with wire cutters. Then I wrap a piece of red electrical tape around it to make a little "flag". I stick the flag in the ground. The flags stick about 1 or 2 inches above the mulch. I've never pulled one up weeding.

I like that idea!

I use those ribbed plastic stalks about ten inches long that some growers use for displaying big plant labels. Waste not, want not! But the birds still manage to scritch them out - sigh.

I also use my bedding inventory maps - hand drawn and only comprehensible to me - which work very well for me because I can keep track of when something went in and when I need to thin or refresh. It's not for everyone, I know.

I use two methods. The first goes something like this: daffodils planted precisely in the middle of daffodil clumps. Spider lilies planted precisely between two rows of nandinas and six inches apart.

For the odd clumps of this and that, I use a piece of a vinyl window shade slat about 8 inches in the ground. I stick it into the ground right in front of the bulb at planting time. You can mark on them with a Marks-alot and the ink will last IF you put the ink under the ground level. Either way, when I see the slat, I know there's something important down there. The beige ones are basically the color of mulch, so they're not intrusive. Of course, you have to pay attention or you'll miss them, too.