Keep in mind when planting that Golden Plume is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside. Try to keep the ph of your soil between the range of 6.1 and 7.5 as Golden Plume likes to be in weakly acidic soil - weakly alkaline soil.
By our calculations, you should look at sowing Golden Plume about 49 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Golden Plume is a tender plant.