Late summer can bring a new problem to lawns and garden edges. Crabgrass and ragweed have spent much of the growing season putting on growth, and both can reach the seed-producing stage as summer moves toward fall.
Removing these weeds before mature seeds spread can reduce another round of unwanted growth. Timing matters, since established plants call for a different approach than young weeds appearing earlier in the season.
Crabgrass Can Leave Seeds Behind for Another Growing Season
Crabgrass grows as a summer annual, emerging from seed, spreading across open ground, producing new seed, then dying after frost. By late summer, mature plants can form seedheads above their spreading blades.
Pull isolated plants before those seeds mature. Moist soil makes it easier to remove the roots without tearing the plant apart. Bag the pulled material rather than tossing seed-bearing plants onto an open compost pile or leaving them on the lawn.
Post-emergent herbicides offer another option where crabgrass has spread beyond a few plants. Check the product label for turf compatibility and application instructions. Pre-emergent products serve a different purpose: they target germinating seeds and work best before crabgrass appears, not after mature plants have filled a patch.
Boiling water and horticultural vinegar can kill plant tissue, but neither distinguishes crabgrass from lawn grass, flowers, or nearby garden plants. Keep those treatments away from vegetation you want to retain.
Ragweed Brings Seeds and Pollen Into the Garden
Ragweed can appear along lawn borders, vegetable garden edges, paths, fence lines, and disturbed soil. Its upright stems and divided leaves may blend into other green growth until flower spikes form.
Removing ragweed before seed development stops each pulled plant from adding more seed to the soil. Hand pulling works for scattered plants, with damp ground helping the roots release. Gloves also keep skin away from plant material.
Pollen presents another concern. Ragweed ranks among the major sources of seasonal pollen, so people sensitive to it should avoid handling flowering plants without protection. Gloves, covered skin, and a mask can limit contact during removal.
Mowing can suppress larger patches before flowering, though cut plants may regrow. Check the area again instead of treating one mowing pass as the end of the job.
Bare Ground Gives Both Weeds Room to Return
Removing crabgrass or ragweed leaves another task behind. Open soil and thin turf create places where weed seeds can germinate when conditions suit them.
Maintain a mowing height suited to the grass species, address compacted soil where needed, and reseed thin areas during the proper season for your lawn type. Garden beds benefit from mulch that covers exposed soil and limits light reaching weed seedlings.
Check lawn edges, beds, and bare patches again before fall. Catching crabgrass and ragweed before mature seeds scatter tackles the plants already visible while reducing the seed supply waiting for another growing season.
Would you pull these weeds by hand, or treat a larger patch another way?
