So back to why this new style of planting is good - well lots of reasons. Many of the selected perennials are long flowering and nectar rich - lots of daisy, umbellifer and thistle type plants are mixed in. As you will hopefully have noticed from the pictures interspersed throughout this piece, nectar loving insects (and I'd assume if you were trying this in the USA hummingbirds?) love these plants and whenever I've visited these kind of gardens or nurseries there is a constant hum. Not only that but thy're low maintenance and good looking so hopefully will replace energy intensive (and unpretty) annual bedding schemes in parks and public spaces.
(Yet another Painted Lady on Rudbeckia 'Toto')
A lot of this goes back to a discussion I was having with someone recently. My point then was that it irritates me that wildlife gardening is perceived as a specialism that is different in some way from ornamental gardening in that wildlife gardens look nasty and are full of nettles. All gardens are wildlife gardens whether we want them to be or not as almost all plants are attractive to animals. Hopefully this newish style will get more people into gardening in a more wildlife-attractive way (even if they don't realise it). You don't have to just use native plants to get this effect either (although North Americans can probably create an awesome all-native garden in this style). Also as the planting is so thick and lush it naturally creates great hiding places for smaller animals. The level of work can be tailored too, at its simplest a prarie or meadow can result from sowing a seed mixture, for the more aesthetically minded a carefully planned Oudolf style scheme will take more planning.