The leaves of herbaceous perennials are turning yellow with their margins already crisp-brown. Trees and shrubs have stopped growing leaves; winter bud scales are well developed over the buds in the axils of their leaves. Perennial plants are getting ready for winter.
Annuals, too, are dying. When your annual flower garden is at the point of no return, set your lawn mower to its highest level and mow down those dead and dying plants. Mowing creates a mulch and keeps stems in place to catch and hold leaves. The roots of those dead plants will decompose in place and create tunnels for the roots of next year’s annuals to follow. Leaving those tunnels is one more reason not to spade the garden next spring. Another? Spading allows weed seeds to germinate by exposing them to light.
Turning to the vegetable garden, cover the earth over winter by planting a cover crop of winter rye at the rate of seven to eight pounds of seeds per 1,000 square feet. The rye will capture nutrients not absorbed by this year’s crop. As well as preventing nutrients from entering the Bay, the cover crop crowds out winter weeds and holds the soil in place. When you plow the cover crop under next spring, it will release those nutrients back into the soil. The decomposing cover crop will also improve both the nutrient- and water-holding capacity of your soil and reduce its density, which will result in improved root growth.
If your day lilies, peonies and hosta are crowded, fall is a great time to divide them and extend your garden or share them with neighbors and friends. For showy flowers in May, transplant peonies shallow, making certain that the eyes, the flower buds, are at grade and not covered with more than one inch of soil.
To assure a bumper crop of asparagus spears next spring, neglect the bed until all of the stems have turned straw color. That’s the sign all of the nitrogen that has accumulated in the stems and leaves has drained down to the roots. Next spring when the buds start growing, there will be a readily available source of nitrogen for that first burst of spears.
Ask Dr. Gouin your questions at [email protected] Please include your name and address.