As late summer turns to early autumn, many homeowners shift from harvesting to preparing their gardens for the next growing season. Weeds that flower now can drop thousands of seeds that linger in the soil for years, so timely action is essential.
Stop seed production early
Professor Manjot Kaur Sidhu of the University of Maine advises gardeners to focus first on mature weeds that are about to set seed. A single crabgrass or dandelion plant can release thousands of viable seeds. If you are short on time, cut off flower heads and seed spikes before they mature. Late‑summer weeds often have finger‑like grass spikes, papery composite heads, or dense seed clusters that are easy to trim with a mower or hand shears.
Deal with annual weeds
Annual species such as crabgrass, purslane and pigweed will die after the first hard frost, but their seeds can spread widely. Slice these plants at or just below the soil line with a hoe. This method kills the foliage without disturbing deeper soil layers that hold nutrients for your desired plants.
Remove perennial weeds completely
Perennials like dandelions, field bindweed, ground ivy and thistles survive winter by storing energy in deep taproots or rhizomes. Pull or dig them out while the soil is still moist, making sure to extract the entire root system. Never leave uprooted perennials on bare soil; species such as bindweed can re‑root overnight.
Clean tools to prevent spread
After working in heavily infested beds, wash spade blades and hoe edges. This prevents moving root fragments, such as quackgrass rhizomes or nutsedge tubers, to weed‑free areas.
Consider herbicides wisely
Late‑summer is an effective window for applying herbicides or organic weed‑killing chemicals. During this period, perennials move carbohydrates down into their roots for winter storage, so chemicals applied now are carried deep into the root network, increasing effectiveness compared with spring applications.
Dispose of weeds safely
Do not add seed‑bearing or perennial weeds to a home compost pile; typical backyard compost does not reach temperatures high enough to destroy seeds or rhizomes. Instead, seal weeds in a dark plastic bag and expose them to direct sunlight for several weeks, or send them to a commercial composting facility.
Watch for winter weeds
Species such as chickweed, henbit, hairy bittercress, dead nettle and shepherd’s purse germinate in late summer and persist as low‑lying rosettes through winter. They will emerge early in spring, often before crops are planted. Keep an eye on bare soil in September and October, and rake or surface‑hoe any seedlings while they are still small.
Use organic suppressants and mulch
Applying corn gluten meal from late August to early September can suppress winter annual seeds without synthetic chemicals. Cover exposed soil with organic mulch—2 to 3 inches thick—to smother dormant seeds. Fallen autumn leaves also make an effective carbon‑rich cover that breaks down into rich soil by spring.
Plant cover crops after harvest
In vegetable beds, sow quick‑growing cover crops such as field peas. These living mulches improve soil structure, prevent erosion, and outcompete weeds for moisture, nutrients and light.
By dedicating time to weed control now, gardeners can avoid a massive spring weed explosion, protect crops, and enjoy a cleaner, more productive garden with less labor next season.
Original reporting: KRDO (Colorado Springs metro) — read the source article.
