THE FALL IS COMING, the fall is coming. Nothing to worry about, Chicken Little, if the garden’s been planned for all-season enjoyment…well, unless you slack off now and let those foxy weeds go to seed and gobble up the whole place. No, no definitive “end” to the season lies ahead, and some of us even feel happy about the coming of slightly quieter, more contemplative times where less obvious garden stars can shine. Peak planting and dividing time is now; make that work include some focus on the addition of fall and winter plants to the landscape.
TREES & SHRUBS
BE SURE TO WATER trees now through hard frost, so that they enter dormancy in a well-hydrated state. Evergreens (needled ones and broadleaf types like rhododendron, too) are particularly vulnerable to desiccation and winterburn if not well watered before the cold and winds set in.
DON’T PANIC IF EVERGREENS start to show some browning or yellowing of needles this month and next. The oldest, innermost needles typically shed after a few years on the tree.
HOPEFULLY YOU STOPPED FEEDING woody plants in July or August. Promoting more soft growth after July-ish isn’t good; time for them to start moving toward the hardening-off phase of their cycle. No more eats till earliest spring.
ALWAYS BE on the lookout for dead, damaged, diseased wood in trees and shrubs and prune them out as discovered. Ditto with suckers and water sprouts.
VEGETABLE, FRUIT & HERBS
AS VEGETABLE PLANTS (and annual flowers) fade, pull them to get a start on garden cleanup. Before composting the remains, cut them up a bit with a pruning shears or shred, to speed decomposition.
PARSLEY AND CHIVES can be potted up and brought indoors for offseason use. A few garlic cloves in a pot will yield a supply of chive-like (but spicier) garlic greens all winter for garnish. Sow seeds of bush basil in a pot, too, and grow on a very sunny windowsill if you are a really determined type.
IF NEXT YEAR’S GARDEN plans include a patch of strawberries or asparagus, do the tilling and soil preparation now so the bare-root plants ordered over the winter can be planted extra early come spring.
AS AREAS COME EMPTY from harvest, build vegetable-garden soil by sowing cover crops: medium red clover may still work, or perhaps winter rye if you don’t do some areas till mid-fall. These “green manures” will be turned under to improve soil tilth and fertility.
IF YOU HARVESTED YOUR own garlic, save the best heads with the biggest cloves for replanting later this month or next (about a month before frost is in the ground). Otherwise, order bulbs now. Prepare a sunny spot, and plant each clove 1-2 inches deep and 6 inches apart in the row, with about 12 inches between rows. Green growth will happen this fall, which is great; don’t panic. It’s a hardy thing.
DON’T DEADHEAD FADED perennials, biennials and annuals if you want to collect seed (non-hybrids only) or will let them self-sow. Nicotiana, poppies, larkspur, clary sage and many others fall into this leave-alone group. So do plants with showy or bird-friendly seedheads, like coneflowers.
DAYLILIES can be dug and divided as they complete their bloom cycle, right into fall, if needed.
PEONIES are best divided and transplanted in late August through September, if they need it. Remember with these fussy guys that “eyes” must not be buried more than an inch or two beneath the soil surface. Want more peonies? Now’s the time to order from places like Klehm’s (see Sources list).
MANY POPULAR ANNUALS can be overwintered as young plants if you take and root cuttings now rather than try to nurse along leggy older specimens. Geraniums, coleus, wax begonias, even impatiens (to name just a few common ones), if grown in good light indoors and kept pinched and bushy, will yield another generation of cuttings for next spring’s transplants. Probably best to expend this effort and space on things you really treasure—an unusual form of something, not the garden variety.
ORDER BULBS promptly (see Sources), and plant as they arrive (lilies most urgently). Remember our “early, middle, late” mantra when ordering.
PREPARE NEW beds for fall planting by smothering grass or weeds with layers of recycled corrugated cardboard or thick layers of newspaper, then put mulch on top.
RE-EDGE BEDS to make a clean line and define them. Don’t let them get overrun just because summer’s wound down. A clean edge makes a big difference.
REST AMARYLLIS BULBS by putting them in a dry, dark place where they will have no water at all for a couple of months. I put mine in a little-used closet.
IF HOUSEPLANTS NEED repotting, do it before they come inside later this month (less messy than in the house!). Don’t step up more than an inch (on small pots) or a couple (on large ones). Most plants don’t like to swim in their containers.
MID-AUGUST TO MID-SEPTEMBER is prime lawn-renovation and planting time in the North. Have you reseeded yet?
DON’T BAG OR RAKE clippings; let them lie on the lawn to return Nitrogen to the soil.
COMPOST HEAP & MULCH
Order a supply of bulk mulch, which is cheaper than the packaged kind and also eliminates the waste of all those heavyweight plastic bags. Many local nurseries deliver. Top up mulch in all garden beds as they get cleaned up gradually in fall.
DON’T LET THE HEAP dry out completely, or it will not “cook.” Turning it to aerate will also hasten decomposition, but things will rot eventually even if not turned.