Alligare Imazapyr 4 SL Herbicide, 1 Quart Review

Our Verdict

A legitimate product with a genuinely narrow correct use, and the wrong purchase for most people who end up with it. Imazapyr is non-selective and — unlike glyphosate, which Purdue notes has no soil activity — it is strongly soil-active with residual measured in many months. That is exactly what you want for bare ground you intend to keep bare: a gravel yard, a fence line, under a guardrail, site preparation. It is exactly what you do not want anywhere near something you value, because root uptake means damage is not limited to what the spray touched. Trees and shrubs whose roots extend under a treated strip can be killed by an application that never contacted their foliage, and that damage appears months later when the cause is no longer obvious. Two further consequences of the residual: nothing will establish in treated ground for a long time, so this is not a pre-renovation product, and the label's replant intervals are the binding constraint rather than a suggestion. Our rating reflects the mismatch between how it is bought and what it does, not the product's quality — used on genuine bare ground it works extremely well.