Our Delphinium plants are supplied as 2cm dia plugs to plant-on in a pot or plant directly in your garden. This size has the best transportation results, we use bespoke packaging to protect the plants in transit. They are young having been grown on from cuttings in the nursery so care is needed. Dig a small hole, put the plug with the roots in the ground and press soil around. Water well. Please contact us for any other gardening advice.