Keep in mind when planting that Lady Ilchester is thought of as half hardy, so protect with a row cover whenever the temperatures drop. Ensure your soil has a ph of between 6.0 and 6.5 as Lady Ilchester is a weakly acidic soil loving plant.
By our calculations, you should look at sowing Lady Ilchester about 105 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Lady Ilchester is a half hardy plant.