I kept getting this error message in HoB.

I had this type of notification prior to Cottage Living (we need to come up with a shortened name, not to be confused with City Living). True, enough I was using cc Harvestables made by Icemunmun. But all I needed to do was to place them out on the lawn, as opposed to the largest gardening box available. Sure enough, the seed would sprout. I shall have to try transferring the burgeoning plant to inside at some point, to see if that's possible. Most of my crops are inside the greenhouse.