We live in san diego, I am getting grass put in today and have left a large patch (about 8ft by 15ft) free so that I might plant a butterfly garden or other type of flower garden soon. This is my first garden and I am hoping to get my 3 year old involved so I need something colorful, easy and robust. The space gets about 6-7 of sun a day with a little shady spot further down, next to citrus tree. Any advice on what I should plant? or if a butterfly garden is appropriate this time of year?