I have a few trades of Cleome lutea seeds ready now and a few more as the seeds ripen.
These are for wintersowing ONLY! I had way too many complaints last year about the seeds not growing immediately. I planted some of my collected seeds in some bare, compacted clay last fall and now I have a patch of plants four feet tall and covered with blooms. They went through -12° F and many freeze/thaw cycles. They have not received irrigation so they have only had water once in the past three months. This is how they grow in nature.
If you want to grow these I suggest you find some nasty, gray clay soil, mix in some gravel and a bunch of lime, pack it down well and leave it outside all winter. If you want to grow this where the winters are mild you might have to put it in the freezer. Never water them. If you live in a place that gets more than 15" of rain a year, put them under a roof overhang where they will stay dry.
Check out my tradelist if you are interested. I am always open to trades for unusual cold and arid adapted plants. Please be patient when you contact me. My job requires that I travel to remote areas for three or four days at a time in summer and I often do not have internet service available.
