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If you are looking for gardening advice, tips and solutions, use McGregor’s Help Shed for answers to all your gardening questions. The smallest and simplest tricks can make all the difference in your garden. Use the ‘Ask a question’ tool to submit your own questions for our gardening experts.

Latest Questions & Answers

How do I get rid of perennial weeds in my garden?

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Many perennial weeds require deep digging to winkle out their roots. It’s all too easy to leave the root fragments behind; dandelions and twitch are notorious for this. A glyphosate based herbicide such as McGregor’s Weed Out is a good choice for twitch…

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How do I keep my garden weed free?

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Weeds are here to stay, the seeds arrive in your garden in various ways, by sticking to your shoes, clothes, or are carried in by birds and wind. Here are some tips to help keep weeds at a manageable level. …

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I have a stump in my garden which is re-sprouting, how can I stop/kill it?

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When a tree or shrub is cut down the majority of the plant may be left in the ground as a substantial root system. The stump often re-sprouts with renewed vigour. Even if the stump is removed, some trees and shrubs will re-sprout from small pieces of the roots left in the…

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I have broadleaf in my lawn, how do I kill it without killing my lawn?

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Make sure to use a specific Broadleaf spray like McGregor’s Weed Out Advanced Weed Killer. This product kills the weeds, roots and all and leaves no soil residue. …

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I have weeds growing amongst my lawn, how do I treat this without damaging my lawn?

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Broadleaf weeds such as Onehunga weed, daisies, hydrocotyle, clover, dandelions and thistles can spoil your lawn. Dig them out with a kitchen fork, knife or screwdriver, making sure you remove every centimetre of root so they don’t simply re-sprout. For…

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I think I have clover growing in my lawn, how do you suggest I treat is without harming the grass?

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Clovers are an extremely common weed found in gardens throughout New Zealand. Clovers have creeping stems and distinctive leaves which are quite small and slightly notched at the tip. Clover flower heads are often visited by bees. There are several species…

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I think I have Hydrocotyle in my garden, how do I identify it and get rid of it?

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Hydrocotyle has a hariy leafy which is often stalked at the centre. It is a mat forming weed, making it usually widespread. Use McGregor’s specialised Hydrocotyle lawn weed control for the best results.…

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Is Dandelion bad for my lawns, if so how do I get rid of it?

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Dandelion is technically a weed so you should treat it. Use a general weed killer like McGregor’s Weed Out Weed Killer, it leaves no soil residue so won’t affect your lawn. …

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There are prickles all over my lawn, how do I get rid of them?

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This is most likely Onehunga weed or Prickle weed, it is a bunched prickle that can make walking on the lawn painful. Treat Onehunga with McGregor’s Onehunga Weed Out treatment for specialised results. …

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What can be used to eliminate path weeds?

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Use a hoe on gravel paths or spray with a glyphosate-based herbicide. Be careful of spray drift – spray only on a still day, and hold up pieces of cardboard to protect nearby plants. You can use a knife or weeding tool with a hook to remove weeds from…

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What exactly does Yarrow look like and what is the best way to treat it without harming my lawn grasses?

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Yarrow is a common weed of pastures, roadsides, gardens and waste places. It has feathery branched leaves and sends up a flower stalk topped with a disc of white or pink flowers. It spreads easily by sending out rhizomatous roots from which new plants grow forming a dense mat of…

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What is a ‘selective’ and ‘non-selective’ herbicide?

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Selective herbicides are used in lawn care or around nursery or garden plants once weeds emerge. A selective herbicide is used to kill weeds, but does not kill the valuable plant. Non-selective…

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What is the best and most effective way to deal with climbing weeds?

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Control invasive weeds such as 'Wandering Willie' (Tradescantia Fluminensis) and 'Convolvulus' with herbicide. Spray only during warm, dry spells and be prepared to do follow-up sprays. Spray the whole plant, and then follow up with another spray two or…

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What is the best way to treat prickle weeds in my lawn?

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Onehunga weed, commonly called prickled weed, and bindii in Australia, is a branched prickly-seeded weed that forms in patches up to 40cm across in lawns, playing fields and golf courses. It is a…

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What is the most effective treatment to control thistles whilst not killing my lawn?

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There are several species of thistle that are weeds in New Zealand; Nodding Thistle, California Thistle, Scotch Thistle and Sow Thistle. Californian Thistle is a perennial and can be difficult to control due to vegetative growth from its creeping and spreading root system. In mown lawns it…

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What is Wandering Jew?

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Wandering Jew (also known as Tradiscantia and Wandering Willie) is a trailing, soft, hairless, perennial groundcover weed. Succulent, soft, creeping stems root at nodes where they touch the soil, the leaves are dark green (sometimes black), shiny, smooth, and are oval with pointed tips. White…

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