Keep in mind when planting that Maximum T&M Mixed is thought of as very hardy, so this plant will tend to survive through freezing conditions. Maximum T&M Mixed 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 Maximum T&M Mixed about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Maximum T&M Mixed is a very hardy plant.