Ridding Myself of Four O'Clocks

I dug out my white Four O'Clocks growing in the back bed.  I'm getting tired of them, and I have them growing in the Long Border and the back bed.  And I had them growing in the bed adjacent to the dining room but I dug them out a couple of weeks ago.  I want to use the space in the back bed for cosmos and zinnias.  Keeping the flowerbeds free of Four O'Clocks will take quite a bit of continued effort because its pretty hard to find all the bulbs.  Plus Four O'Clocks throw off a lot of seed.  These bulbs can get really big, I took a picture of some of the big ones I dug up (with my glove next to them to use for perspective).