Scotts Lawn Builder™ + Weedkill Slow Release Lawn Fertiliser

Australia's most popular lawn fertiliser has an excellent reputation with home gardeners and professional turf managers alike. The 'set and forget' solution to having a great lawn all year round, this product includes selective herbicides that will kill most broadleaf weeds with exceptions

  • DO NOT USE on buffalo, carpet grass, lippia, dichondra or Santa Ana couch
  • Slow, continuous feeding for three months
  • Controls 16 common broadleaf weeds
  • Will not burn when used according to the label directions
  • No surge growth = less mowing
  • Deeper roots and stronger plants
  • Thickens lawns to prevent weeds
  • Superior results compared to traditional lawn fertilisers

Three selective herbicides

Weedkill contains three selective broadleaf herbicides that will control a broad range of weeds (see technical details below for a list)

Greener stronger lawns

Boosted iron and sulphur content promotes deeper green and stronger growth. The thicker the lawn, the less chance weeds have of taking hold - they're smothered before they become obvious and need treatment

Controlled feeding

Slow release of nutrients eliminates waste through run-off and leaching and prevents burning and surge growth

No surge growth after application

Traditional lawn foods release or 'dump' most of their nutrients within a couple of weeks of application, causing a rapid surge in growth that quickly drops off again as the food supply diminishes. Scotts Lawn Builder™ uses patented time-release technology to ensure nutrients are released slowly and continuously over a three month period

Low phosphorus

Weedkill has 1% phosphorus, which means it can be safely used anywhere in Australia without posing any risk to ground or surface water

Low application rate

The recommended application rate is just 16 grams per m2, not the kilograms often associated with regular lawn foods!


2.5kg bag

Suitable for

Weedkill can be safely used on lawns containing common couch, bent (not on bent greens), kikuyu, perennial ryegrass and/or Chewings fescue ONLY

Not suitable for

DO NOT USE on buffalo, carpet grass, lippia, dichondra or Santa Ana couch as these grasses and lawn substitutes may be damaged by this product. This includes all named varieties of buffalo - Sir Walter, Palmetto, Sapphire, etc

DO NOT lay new grass or sow patching products within one month of application

Do not apply on or around food plants or animal feed crops

Do not use on new lawns until at least 4 weeks after the first mowing

Do not use if the temperature is expected to exceed 30 degrees C - wait for a cool spell

How it works

  • Weedkill is a slow release fertiliser that provides continuous nutrition over a three month period while eradicating selected broadleaf weeds
  • Every granule of Weedkill contains Scotts patented time-release nitrogen
  • Nutrients are released at about the same rate that grass roots can take up the fertiliser so there is no wastage, run-off to waterways or damaging surge growth

How to use

How much will I need?
Weedkill has a recommended application rate of 16g/m2.
To work out how much you will need to fertilise your lawn:

  1. Calculate the area of the lawn in square metres (multiply the length by the width)
  2. The area multiplied by the application rate will give the exact amount of Scotts Lawn Builder™ you need
  3. Use a set of scales to weigh it out and then add it to the spreader ready to apply - do not be tempted to add a 'bit extra for luck' because over-application may result in nitrogen burning

    As a guide:
    ¼ of a tennis court is about 65m2
    ½ of a tennis court is about 130m2
    An entire tennis court is about 260m2 

How do I apply it?

  1. For best results ALWAYS use a Scotts spreader
  2. Check your model and make sure to set it correctly before you start (settings are also on the back label of the product)

    EvenGreen Drop Spreader - setting 5
    EasyGreen Rotary Spreader - setting 26
    HandyGreen or Easy Handheld Spreader - setting 4¼

  3. If you don't have a spreader, make sure you distribute the fertiliser evenly over the lawn - uneven applications may result in 'hot spot' burning where too much has landed in one spot
  4. Don't attempt to cover the area in one pass - you may under or over apply. Even coverage may be better obtained by passing over the entire area at least three times, moving at a different angle and applying about one third of the total amount in each pass
  5. Apply to moist foliage. If the lawn is not moist from dew or recent rain, wet the area to be treated
  6. Allow the product to remain undisturbed on the lawn for 24 hours before watering in thoroughly
  7. Rain, watering or heavy foot traffic within 24 hours can knock granules off weeds and may reduce the effectiveness of the weedicides
  8. Do not mow within 48 hours of applying this product

For a complete guide on how to use Scotts Lawn Builder™ + Weedkill Slow Release Lawn Fertiliser, watch the video on this page and always check the packaging

When to use

Recommended Application Times & Weeds Controlled
Autumn to early Spring: Bindii (Onehunga Weed), Capeweed, Catsear (Flatweed),
Chickweed, Dandelion, Fumitory, Hydrocotyl (Pennyweed), Mallow, Mouse-eared Chickweed, Plantain (Lambs Tongue)

Spring & Summer
Cobblers Peg, Creeping Oxalis, Chickweed, Dandelion, Hydrocotyl (Pennyweed), Plantain, Fat Hen, Catsear (Flatweed)

Year round:
Clover, Pearlwort, Staggerweed, Wireweed
Best control will be gained when weeds are actively growing and young, rather than when they are flowering or seeding

  • Do not apply if weeds are stressed due to dry, frosty or excessively moist conditions
  • Do not apply if rain or irrigation is expected within 24 hours
  • Avoid applying when daytime temperatures are forecast to exceed 30 degrees
  • Do not re-apply for at least 10 weeks after initial use

Safety Information

IMPORTANT: This product, when wet, will cause iron stains. Be sure to sweep all granules off paths, coping, paving, diveways, shoes, etc immediately after use. Do not allow the granules to come into contact with these surfaces when they are wet.

Store safely out of the reach of children and pets. This product contains iron which can be harmful to dogs' livers if eaten in quantity. It also includes herbicides which may be dangerous.


  1. DO NOT allow granules to come in contact with or drift on to plants you do not want killed, such as shrubs, flower beds and vegetable gardens. Grapevines and tomatoes are particularly sensitive to this product
  2. DO NOT allow containers or granules to get into drains, sewers, streams or ponds
  3. DO NOT feed grass clippings from treated areas to poultry or other animals
  4. This product is harmful to aquatic organisms and very toxic to some plant species (it will kill them)

Technical details

  • NPK 20 : 1 : 15
  • Herbicide active constituents are 2,4-D, mecoprop and dicamba acid
  • Feeds for 3 months without burning when used as directed and applied at no higher than the rate recommended on the bag
  • Includes Scotts patented time-release nitrogen and potassium formulated to release nutrients as your lawn needs them

Where to buy it

Decided what product best suits your needs? Or would you prefer to go in-store to ask for more information?

Visit your local Bunnings Warehouse for our largest range.

You can also find Scotts products in a number of gardening, hardware, independent and supermarket retailers including Flower Power, Mitre10, Coles and Woolworths.

Note: Not all brands and products are stocked in all stores. For any additional questions please visit our contact us page.

In New Zealand, go to your local Bunnings warehouse

Tips, tricks & advice

Identify and fix patchy and thinning lawns

Winter, summer, pests, weeds, pets and kids can all damage your lawn, but don’t panic - repair is fast and easy.

Read more

Seasonal Lawn Care Tips

Understanding your lawn's seasonal requirements will help you keep it looking terrific all year.

Read more

Other products you might need

Scotts® Easy Handheld Fertiliser Spreader

Bunnings Hand Spreader med res.jpg

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Accurate delivery of a granular lawn fertiliser at precisely the right rate is the hallmark of this drop bar spreader. The ultimate lawn fertiliser applicator.

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