abundance ageratum annuals appearance bedding bloom bloomimg blooms blue-billy-goat-weed blue-billygoat-weed borders chick-weed clusters color colored colorful colour coloured colourful containers cultivars cultivated edging exotic flora florets floss floss-flower flower flowers fluffy fuzzy garden-plants goatweed green greenery hardy leafy leaves potting-plants profusion purple rock-gardens round soft weed wild