Gus: I was intrigued by these shamrocks you described and thought I might like to plant a few myself. With a quick search I found the following website that describes and sells various shamrock varieties including the Iron Cross.


https://www.easytogrowbulbs.com/collections/oxalis-shamrocks

I'm sure with a bit of effort you will find other sources that might be more convenient or cost effective. Any other information you have please post since I plan on ordering some.

Thanks -tnscouter