Keep in mind when planting that Shibouri is thought of as tender, so it is imperative to wait until temperatures are mild before planting out of doors.
Growing Shibouri from seed
By our calculations, you should look at sowing Shibouri about 25 days before your last frost date.
Transplanting Shibouri
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Shibouri is a tender plant.