Keep all of these in mind when planning the job to achieve the best results. There are a few important details to remember when spreading weed & feed. In this case, however, you cannot re-apply the chemical immediately because you will over-feed the lawn and potentially cause a chemical scorch. If it does rain or the lawn gets drenched, it will wash the granules off the leaves.
This allows time for the herbicide to absorb into the leaves. You should also pick a time when no additional rain is expected for two days, and you should avoid watering your lawn over this period. You should spread weed & feed on damp/wet grass (use a sprinkler or apply just after rain) so that the granules stick better to the leafy portions of the weeds. Applying weed & feed during the winter will have absolutely no effect on the lawn in the following spring and summer. It’s important to apply weed & feed when weeds are actively growing. The exact blend of fertilizer ingredients varies by brand, but all products will contain some percentage of nitrogen. Some products also include additional benefits, such as timed-released nitrogen for extended feeding. The “feed” portion of weed & feed is a fertilizer that contains some combination of nitrogen, phosphorous, and/or potassium to green up your lawn. The same concept applies for the foams: they sit on and are absorbed by large weeds, while they run off of grasses. There are also liquid forms of weed and feed that are generally applied with a foaming sprayer. The granules will not sit on grass blades, which is why weed and feed generally doesn’t kill regular grass unless it is incorrectly applied (over-saturating, especially, can cause grass death). Not to be confused with pre-emergent, the chemical is usually sold in granules that are applied to and subsequently absorbed by the leaves of the weed. The “weed” portion of weed and feed is one of a variety of broad leaf-targeted herbicides (usually Dicamba, 2,4-D, and/or MCPP) that attacks dandelions, dollarweed, and most other green leafy weeds. A healthy lawn, in turn, discourages weed propagation, enabling the use of a reduced amount of the product over time. It generally improves your lawn’s ability to absorb water and food, and adds necessary nutrients which promote healthy growth. Weed & feed is the generic name for a broad range of lawn chemical products designed to strengthen existing grass and kill off certain weeds in a single application.
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