Keep in mind when planting that Fordhook mix is thought of as very hardy, so this plant will survive though longer winters with little or no damage. Fordhook mix requires a loamy soil with a ph of 6.0 - 7.0 - it grows best in weakly acidic soil to neutral soil.
By our calculations, you should look at sowing Fordhook mix about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Fordhook mix is a very hardy plant.