Hi, I copied the info below from the Gardener's World web site.Although I haven't grown this variety before it sounds manageable.They say it often does not reach the height of 120 cm and it is this height with the flowers. I would place it at the back of the border as even if it does not get to its full height you will be able to grow a lot of other smaller plants in front of it. It also does not come into its own until late summer so for a lot of the year its leaves can be a backdrop for other plants.Hope this helps.
From Gardener's World web site: Traditional pampas grass is a familiar sight in the grounds of many stately homes, but it's often too big and bulky for many smaller gardens. Fortunately, this recently introduced dwarf variety has revived interest in this plant and it's being used more frequently by gardeners look for something a bit different. The plant retains its leaves throughout the year and has delicate, golden-green leaves that give a garden a modern, prairie-style look. It produces tall, feather-like white flowers in late summer that will double the height of the plant, although it rarely reaches higher than 1.2m (4ft). It does best in a sunny or partially shaded spot, and prefers light, sandy or well-drained soil.
Cultivar: Splendid Star
Plant type: Evergreen shrub
Foliage colour: Golden
Feature: Dramatic foliage
Sun exposure: Full sun, Partial shade
Soil: Well-drained/light, Clay/heavy, Moist
Skill level: Beginner