The heat of summer is (hopefully) now behind us and my attention turned to the two containers in front of my house. This summer I planted them with butterfly-loving pentas, petunias, summer snapdragons and trailing fan flower in a color scheme of red and white. I added time release fertilizer to the soil and gave them a shot of liquid feed about once a week. We were away a week in August, and I wasn’t always Johnny On The Spot with the watering can, and they got a little too dry more than once. It is time to replant them for fall.
The white Angelonia is still looking good, so I may leave that in as a tall focal point. Fall is ubiquitous for mums so one might find its way in as well. Pansies are a great cool season crop that will last through the winter. I’ve had pansies and violas still look great the following spring season. Other flowers like asters or coreopsis will add blooms in a range of colors but many not survive the winter in a container.
The problem that plants in containers have is lack of insulation. Air surrounding the pot will freeze and thaw the roots over the course of the winter when temperatures fluctuate. This is especially true in dark colored pots on very sunny days. For a plant to survive the winter in a container, it needs to be two zones hardier than the zone you are in. Here in Lancaster County we are in USDA Hardiness Zone 6, meaning that our winters rarely get below 0F. Plants need to be rugged enough to survive Minnesota seasons to overwinter in a container here. Hostas, sedum, arborvitae, and hollies are all in this group. On a side note, hydrangeas and roses, which are popular choices to grow in decorative in containers over the summer, are best planted in the ground in the fall.
Back to my pots. Foliage and texture are more important considerations than flowers in the fall and winter. Fine texture from grasses or sedges and bold textures from the colorful leaves of coral bells, ornamental cabbage and kales create exciting contrast. I particularly am drawn to ornamental cabbage and kales. They are closely related to their edible cousins cauliflower and broccoli, but selected for their colorful rosettes. As the nights cool the color accelerates. Cabbage and kale also last well into the winter. Their main problem is cabbage worms and sometimes aphids. Insects are less of a problem as temperatures dip. I also really like coleus for fall as the multitude of shades from rusty reds, dark purples and lime greens mix well with mums and other flowers. They are particularly frost sensitive however.
Fertilizing is less important in the fall. I usually don’t even bother to fertilize my containers after the middle of September. Soon it will be time for the local fairs, pumpkins and mums will abound and we’ll close the book on another gardening season here in Lancaster County. But not just yet.
Edit to add: I eneded up completely redoing my pots with small perennials and some scavenged berries.
What is the first thing you do when someone gives you flowers? If you are like most people, you lift them to your nose and sniff. Our brains tell us flowers SHOULD be fragrant. Unfortunately, most are no longer. Bred for large size and diverse colors, fragrance seems to be an afterthought. If you want to add back fragrance to your yard here are my Top 20 Fragrant Plants.