Chrysanthemums. Late summer or early fall is an excellent time to plant mums, one of the symbolic flowers of the season. Practically any time in September that strikes your fancy is a good bet, so long as it's at least six weeks before the year's first frost.
Fill the Gaps with Fall Flowers
Now is your chance to put in some fall bloomers like mums, asters, sedum, pansies and flowering kale. Small ornamental grasses could also work nicely and they will keep their form into winter, giving you extra time to enjoy them.
For green interest, plant dusty miller and ornamental peppers, cabbage, and kale. Additional annuals to explore include angelonia, begonia, coleus, lantana, calibrachoa, cosmos, globe amaranth, impatiens, lobelia, marigold, petunia, spider flower, sunflower, and zinnia.
Plants like chrysanthemums, nasturtiums and asters are wonderful choices for seasonal planting arrangements. While perennials that will survive the winter are great choices, autumn is also a great time to explore new ideas will short-season annuals too.
Because the soil will expand and contract greatly over a harsh winter, those who grow where the ground freezes hard should empty out plastic, ceramic and clay pots to protect them from cracking. Or you can just bring the whole schmageggie inside to a place that will remain above freezing.
Winter Protection Techniques
If possible, find an area in the garden that you can dig up, and sink the pots into the ground so their roots will be insulated by the surrounding soil; then mulch heavily with straw, shredded bark, or leaves as you would other plants.
You can put them in a garage or shed that gets cold but doesn't freeze, ever. They will over-winter as live but semi-dormant plants. Keep the soil just moist, not letting the potting medium shrink and pull away from the pot edges.
Get creative with seasonal favorites such as mums, flowering kale, and pansies, or play with dynamic combinations of annuals, perennials, and grasses that also make excellent fall container plants.
By planting a fuller container, you will see immediate results that can last for the remainder of the fall season. Try to plant by early September to give your plants a chance to kick in with some growth before the cooler temperatures and shorter days slow things down.
Wrap pots in burlap, bubble wrap, old blankets or geotextile blankets. It isn't necessary to wrap the entire plant because it's the roots that need shielding. These protective coverings will help to trap heat and keep it at the root zone.
Flowers to plant in September
English marigold (Calendula) has deep orange petals, which are perfect for a hot border or for cutting. It's easy to grow – from an autumn sowing it should flower from May. Sow direct into shallow drills or on the surface of moist peat-free compost, in pots.
Late summer and early fall, such as September, is the best time to plant chrysanthemums which are hardy perennials that will grow back each and every year with the proper care. Peonies are also perennials, so after you plant them once in September, they'll come back year after year with the proper care.
Some fast growing fall crops like lettuce and radishes can be planted into late September, but many desirable fall crops like broccoli and carrots need several months of prime-growing conditions to mature before frost and low light levels set in. When in doubt, plant your fall crops a little early.
Take Special Precautions for Potted Plants
To protect them, you can wrap the pots in an insulating material (think burlap, old blankets, or even bubble wrap), place them close to the foundation of your house, and arrange them close together. You can also put a layer of mulch over them for added protection.
1. In order to overwinter a perennial or shrub in a container outside, it needs to be two zones hardier than the zone you live in. 2. Perennials and shrubs that are in your zone or one colder can be overwintered in an unheated garage, buried in the ground, or transplanted.
The solution: Keep your houseplants in their plastic nursery pots for at least the first year. You can still use your pretty pot, Lawrence and Gutierrez say. Just slip the new plant, plastic pot and all, into the decorative pot and cover the top with Spanish moss or rocks to cover any gaps.
As long as used potting soil still looks fairly fluffy and doesn't emit a rotten odor, gardeners should be able to use it again with good results. However, if the plants formerly grown in the potting soil struggled with disease or insect problems, it's probably best to discard the mix and start fresh next season.
If you have any doubts, find a spot in the garden shed or garage to keep the pot away from the elements. Pots with unglazed interiors can absorb moisture and crack during the winter when water freezes between the clay pores.
From early fall through most of November is one of the best times of year to plant spring-blooming bulbs, cool-season annuals and vegetables, as well as many trees, shrubs, and perennials. On this page: WHY PLANT IN FALL. SPRING-BLOOMING BULBS.