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pre grass seed weed killer

Step 6 – Watering: For best results newly sown seed must always remain moist and unless conditions are naturally damp. Water once twice per day for approximately 3-4 weeks depending on weather. Once germination occurs reduce watering unless conditions are very dry.

Step 1 (to be done well in advance) – Kill Existing Vegetation: Kill off any vegetation such as weeds and grass with Glyphosate herbicide or similar systemic herbicide or thoroughly did out vegetation, or cover the area with a black plastic sheet several months prior. This will make life much easier for rotovating and will prevent unwanted weeds growing through the new turf.

Step 2 – Rotovate: Rotovate or dig through the area to a depth of approximately 100mm deep to relive compaction and to create a workable tilth. Several passes with a rotovator may be necessary.

Timing

Sowing a new lawn from seed is a great way of creating a cost effective lawn, but it important to consider the time of year you are doing it, carry out correct preparation and be patient as the lawn establishes over several months.

Lawn Seeding can be done by professional contractors such as Lawntechs’ sister company Hewlett Turf & Landscapes or you can do it yourself with a little time and effort.

Step 7– First mow: Carry out the first mow on a high setting approximately 4-8 weeks after germination or once the new grass is about 2-3 inches long. The new seed will gradually thicken up and fill in over several months.

Step 4Fertiliser: Apply pre-turf/seed fertiliser @ 35 grams per square metre.

Pre-emergence weed killers prevent seeds from sprouting. They create a chemical barrier on the soil surface that suppresses seed development. What this means is, if you sow your own seed after applying a pre-emergence weed killer, the seed isn’t likely to grow. However, some pre-emergence products only affect grassy weeds, so you can safely sow most vegetable and flower seeds after applying these herbicides. The same doesn’t apply to reseeding or overseeding your lawn. Grass seed won’t sprout until a pre-emergence weed killer has decayed and become ineffective. For example, it isn’t safe to sow lawn seed until four months after applying a crabgrass preventer.

Sowing seed after applying a pre-emergence weed killer disturbs the chemical barrier on the soil surface, which means that weed seeds may germinate too.

You can sow seeds in as little as a week or even sooner after spraying glyphosate, a systemic, nonselective weed killer. Glyphosate moves from the leaves to the roots of plants, destroying the entire plant, but leaving no residue in the soil. The chemical affects many types of plants, including weeds, grasses and desirable plants, but after the liquid is absorbed into the plant, it doesn’t pose any further threat. You can safely sow ornamental flower seeds a day after spraying with glyphosate and grass and vegetable seeds, three days after, even though the herbicide takes up to seven days to destroy weeds. If you remove the dying weeds too soon, live roots could remain in the soil, ready to regrow. Another systemic weed killer that doesn’t affect seeds is pelargonic acid.

Warning

It makes sense to be cautious about sowing seed after using weed killer. Certain herbicides can harm sprouting seeds and young plants. However, while you must wait several months to sow seed after applying some weed killers, you only need to wait a few days after applying others. The reason for this difference lies in the effect of the active chemicals in the individual products. Read the label carefully and follow all the directions when applying a weed killer.

Many selective weed killers leave little or no trace in the soil, and they target certain plants while leaving others unharmed. Generally, these types of herbicides destroy either grassy weeds or broadleaf weeds. You can safely sow most seeds in your vegetable or flower patch a day after applying selective herbicides, such as sethoxydim, clethodim and bentazon, for grassy weeds. These herbicides only affect your desired plants if the plants belong to the grass family. For lawns, herbicides that destroy broadleaf weeds are effective, but it isn’t safe to reseed until a month after applying these products, unless the label states differently.