This Deep Blue Verbena Guarantees A Colour-filled Summer Display. The Plants Have A Softly Trailing Habit With Clusters Of Starry Flowers That Smother The Plants. This Award Winning Strain Of Verbena Has Been Bred To Be Highly Resistant To Downy Mildew So Theyll Produce Healthy, Colourful Plants Until The Frosts.plant Into Good, Moist But Free Draining Soil; Choose A Sunny Site For The Best Display.after Carefeed & Water Plants, Deadhead Spent Blooms Regularly To Keep The Display Going For As Long As Possible.height 30cm/12in. Trails Up To 45cm/18in.