Million Bells 'Mini-Famous Double Blue' Calibrachoa - You really can't go wrong with Million Bells in your sunny basket or containers. They come in a wide range of colours, single or double blooms and the best part... no deadheading required.
Plant thyme to attract bees. Thyme You know this as a go-to herb in your spice cupboard, but the small flowers on thyme are very attractive to bees. Thyme grows low; try the variety “Mother of Thyme” for a great ground cover that will make the bees happy and be useful to you as well.
Boltonia: Looking almost like a tall baby's breath, boltonia is a large, late summer showstopper in the perennial border. Also known as white boltonia and white doll's daisy, its 1-inch-diameter daisy-like blooms may be white or light pink. Cut it back in early summer to promote a sturdier branched plant that requires no staking.
An odd number of crocuses (5 or 7) of the same colour planted in a rock garden is also very effective. They naturalize (i.e. come back year after year and slowly multiply) quite easily and require almost no care. Giant Dutch Crocuses are a must in anyone's spring garden.