Keep in mind when planting that breda giant is thought of as hardy, so breda giant will tend to go dormant or grow slowly over the winter months. breda giant tends to grow best in a soil ph of between 6.1 and 7.8 meaning it does best in weakly acidic soil - weakly alkaline soil.
By our calculations, you should look at sowing breda giant about 5 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as breda giant is a hardy plant.