Roundup vs. Vinegar and Organic Fertilizer Choices for Rye Grass

Two questions: comparing Roundup to 5% vinegar for weed control, and evaluating corn gluten meal (CGM) versus cottonseed meal (CSM) for fertilizing rye grass in North Central Texas black clay (pH 7.5).

Roundup vs. Vinegar

Roundup (glyphosate) is a systemic chemical herbicide with documented toxicity to soil life and potential health concerns. Vinegar (acetic acid) is a contact burndown that acidifies soil temporarily; it's non‑selective and doesn't kill roots. Mulch (4+ inches) is a superior organic weed strategy — it suppresses weeds, conserves moisture, and feeds soil life.

CGM vs. CSM for Fertility

• Cottonseed meal often carries pesticide/herbicide residues unless certified organic. Organic CSM is a good nitrogen source.
• Corn gluten meal primarily acts as a pre‑emergent weed suppressor; its fertilizer value is modest.

For sustainable soil fertility, use alfalfa meal mixed with composted manure as a thick mulch. This builds organic matter, feeds earthworms, and slowly releases nutrients.

More soil‑building info at avant-gardening.com.

— The Long Island Gardener