Keep in mind when planting that Plumosa is thought of as tender, so it is imperative to wait until temperatures are mild before planting out of doors. Plumosa tends to grow best in a soil ph of between 6.1 and 7.5 meaning it does best in weakly acidic soil - weakly alkaline soil.
Growing Plumosa from seed
By our calculations, you should look at sowing Plumosa about 49 days before your last frost date.
Transplanting Plumosa
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Plumosa is a tender plant.