Just like warm season vegetable plants in the vegetable garden, flowering warm season annuals get replaced this time of year. Although the weather is still warm, cool season annuals should be planted now so they can disperse roots before the weather gets too much cooler. Except for a few short term annuals and perennials, most should perform until the weather gets warm next spring.
Pansy, viola, Iceland poppy, sweet William, calendula, stock and the various primroses should get down to the business of blooming rather efficiently, and hopefully compensate for the removal of deteriorating warm season annuals. Ornamental cabbage and kale, as well as cyclamen, can be a bit later because they are a bit more sensitive to warmth, but not slowed much by cool weather.
Nasturtium and alyssum can work as either or both warm and cool season annuals. Both are annuals, so individual plants do not last more than a few months. In hot spots, they may perform well in winter, but then get roasted in summer. In cold spots, they may do exactly the opposite. In the right situations, they self sow and bloom all year. Tired old plants should be groomed out if unsightly.
Chrysanthemums are the most prominent of seasonal color for autumn, and come in all sorts of colors that are ideal for an autumn palette. They are actually perennials that are grown as annuals. Unfortunately, they are usually grown as very short term annuals, that are allowed to bloom only once, and then replaced with something more wintry, like cyclamen or ornamental cabbage or kale.
Like cool season vegetable plants, most flowering cool season annuals should be planted as small plants in cell packs. Chrysanthemum, as well as cyclamen and ornamental cabbage and kale that get planted afterward, are the exceptions that should be planted as four inch potted plants, but they are expensive anyway. Primroses can be planted from either cell packs or four inch pots. (Primroses can cause a serious skin allergy, just from contact.) Nasturtium and alyssum should be grown from seed sown early.
You can say what you like about nasturtiums. My landscape designer colleague, Brent Green certainly did when he named them ‘dago pansies’. They are still one of my favorite flowers, and just might be my favorite, even though none are convincingly white. They were my first. I discovered them when I was very young. They were growing near an old English walnut tree in my great grandfather’s garden. He noticed that I liked them, so found some seeds underneath to send home with me.
Many people have a favorite color. I learned how seriously some people can take their preference for a particular color when I was in high school, and taking care of the yardwork for a few homes in the neighborhood. There were three tract homes next to each other. One was grayish blue, with a silvery blue Sedan deVille in the garage, and a garden of blue flowers. The middle house next door was soft amber yellow, with a buttery yellow Oldsmobile 98 in the garage, and a garden of exclusively yellow flowers. The house next door to that was iron oxide red, with an exquisite rich red Electra in the garage, and a garden of, you guessed it, red flowers.