Keep in mind when planting that Clive Groves is thought of as hardy, so Clive Groves will tend to go dormant or grow slowly over the winter months.
By our calculations, you should look at sowing Clive Groves about 90 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Clive Groves is a hardy plant.