Do smaller plants grow faster than larger specimens?
No, not if all the plants are planted well and are given sufficient feed and water while they are establishing. A plant that is 2m tall will form a 2m+ dense hedge quicker than one that is 1m tall. We planted some of our 175-200cm leylandii in Greenshutters Multipurpose Compost and watered them regularly. We got 60cm+ growth in the first year after planting, 90cm growth in the second year.