Pre-emergent herbicides are truly the unsung heroes of weed prevention because they form an invisible barrier in the soil that stops weed seeds from sprouting. Gardeners and landscapers alike use them ...

A: The three pre-emergents most used and recommended by OSU for homeowners are prodiamine, pendimethalin and dithiopyr. These are the generic chemical names, and they all are sold by several companies ...

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Pre-emergent herbicides stop weeds by attacking roots and shoots before they sprout. They also kill grass seed, so space seeding and spraying at least 12 weeks apart. Plan carefully to time both tasks ...