The Kitchen Sink Mix includes seeds from every plant that produced berries here. (From the idiom “everything but the kitchen sink,” which I’m sure translates poorly out of English, but it is meant to suggest that you have brought everything that is not bolted down.) This includes many plants whose seeds would otherwise never be sold, most of them seedlings that only existed in the given year. In the rest of our mixes, we include seeds from a much smaller number of plants, those that have been judged to be keepers or potential keepers. This mix contains some of those seeds, but also seeds of many, many plants that we judged to be not worth keeping.
If you are wondering whether you should buy this mix, you probably shouldn’t. You might want this mix if you are looking for a source of maximum diversity. The problem is that we choose not to keep varieties for very good reasons. In this mix, you can expect to see a lot of plants that have poor disease resistance, very late maturities, short day tuberization, poor dormancy, very long stolons, and other traits that you typically wouldn’t want. Of course, some will be good, maybe even great, but you will have to grow more seedlings to find those than you would with our standard mixes.