This is an attractive site from the prolific University of Illinois gardening department. It’s useful for beginners, as it explains the difference between terms such as annuals, tender perennials, and seed-setting annuals that behave like perennials. Short articles and clear photos show how to deal with bedding plants, and give tips on watering and mulching. There’s also a useful section with suggestions for hanging baskets, shade, edging, poor soil, and even annual hedges.