How do I set Racchio to water once a month?

I have California native plants and need to do an automatic once a month long soak for some. I’m not seeing an option for anything beyond weekly choices. Anyone know how to automate this (versus manual monthly activation)?
Thanks!

It doesn’t seem to be possible unless you schedule one per each month. It’s unbelievable that Rachio doesn’t just put in an option in their interface to do this

Not ideal I guess but it looks like you could set it up with IFTTT.