Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Keep in mind when planting that Comberton is thought of as hardy, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea). Try to keep the ph of your soil between the range of 5.5 and 7.0 as Comberton likes to be in weakly acidic soil - neutral soil.
Growing Comberton from seed
By our calculations, you should look at sowing Comberton about 63 days before your last frost date.
Transplanting Comberton
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Comberton is a hardy plant.