Leatherjacket Nematodes 100 sqm

(50 customer reviews)


Quantity Price
1 £16.99
2+ £15.99

Control leatherjackets naturally by treating with Leatherjacket Nematodes containing millions of natural nematodes – mix with water and apply the nematodes (Steinernema Feltiae) to the infected lawn with a watering can or an EasyNem ApplicatorIt is best to treat in the Autumn i.e. Sept/Oct/Nov as this is when the leatherjackets are at the most susceptible to the nematodes, but you can treat at other times of the year i.e. NOW, but you must treat at DOUBLE STRENGTH as the mature leatherjackets are much harder to kill. Each pack of 50m Leatherjacket Nematodes treats 100 sqm in the Autumn or 50 sqm when applied at double strength. Leatherjacket Nematodes are a perishable product (it will keep for 2 weeks in the fridge) and needs a daytime soil temp of 10°c, so order when the soil is warm enough and you are ready to apply. N.B. Available NOW or pre-order for the spring / Autumn by inserting a date below.

Special Offer – Help your lawn recover from a pest attack by applying Root Success Fertiliser – Add Root Success and save £1.50 off the combined price (saving applied at checkout).
N.B. Need a Coarse Rose, NemaCan Watering Can, EasyNem Applicator or Hose-end Feeder  – Add one to your basket and save £1.00 off a Coarse Rose OR save £2.00 off a EasyNem ApplicatorHose-end Feeder or NemaCan when bought with your nematodes (savings applied at the checkout).

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Full Description

Daddy Long LegsCrane flies or daddy long legs lay their eggs in the same area of lawn from which they emerge, so numbers increase rapidly. These eggs hatch in August / Sept and the larvae immediately start to feed on the grass roots. The leatherjackets will feed though the autumn, before overwintering. They start feeding again the following spring and gorge on grass roots before pupating to emerge as adults in August. The symptoms of an attack are that grass growth slows and yellow patches appear PLUS the grass easily pulled up with little or no root growth. One of the biggest indicators of an infestation are birds, particularly starlings, which will pull at the lawn (causing even more damage) in search of the leatherjackets to eat.

LeatherjacketsLeatherjackets – In August, customers report clouds of daddy long legs emerging from lawns in early morning leaving behind the casings sticking up in the lawn. As the daddy long legs emerge, they start to lay their eggs back in infected lawns starting the whole cycle again – the next generation of leatherjackets hatch within 2 weeks. Leatherjackets are up to 2.5cm / 1″ long, greyish black in colour, legless and with no distinct head. We recommend treating with Leatherjacket Nematodes in late autumn i.e. Sept / Oct / Nov when the leatherjackets are newly hatched, close to the surface and the soil is warm and the leatherjackets are the most susceptible to the nematodes. You can treat during the rest of the year, but you need to apply the treatment at double strength.

Control leatherjackets naturally by applying Leatherjacket Nematodes containing millions of nematodes (Steinernema Feltiae) to the infected lawn as soon as the leatherjackets are discovered (and the soil temperature is 10c) or when the leatherjackets are active i.e. in the autumn (Sept / Oct / Nov) and in the spring (April). Leatherjacket Nematodes are effective at killing leatherjackets, but is harmless to children, wildlife and pets and the lawn may be used immediately after application. Apply as follows :-

  • Apply Leatherjacket Nematodes in Sept/Oct/Nov – This is the ideal time to treat as the soil is warm PLUS the leatherjackets are newly hatched, the soil is warm (needs a daytime soil temp of 12c) and are the most susceptible to the nematodes, so if you have had leatherjackets in the past or have discovered a leatherjacket infestation or your neighbours are infested and you want to keep them at bay, treat in Sept/Oct/Nov. When applying in the autumn, each 50m Nematode pack will treat 100 sqm. Order for delivery in the autumn.
  • Apply Leatherjacket Nematodes when leatherjackets are discovered – Leatherjacket Nematodes are normally applied in September as this is when the leatherjackets are newly hatched and most susceptible to the nematodes, but if you have discover leatherjackets (not daddy long legs) at any other time of year i.e. in the spring/summer then treat at double strength as the mature leatherjackets are much harder to kill, but you must treat in September as well. When applying in the spring / summer at double strength, each pack will treat 50 sqm. Available ALL YEAR ROUND.

How to apply?Leatherjacket Nematodes are easy to use. Simply mix the harmless powder with water & apply to the lawn using a watering can fitted with a rose (we recommend the Haws Rose no.14) or use a hose-end feeder / Easynem applicator or nematode applicator for larger areas. Leatherjacket Nematodes should be applied to a moist lawn (we recommend pre – watering) on a dull day or in the evening. After application you MUST wash the nematodes into the lawn by watering heavily with a hose or a sprinkler. Once applied the nematodes will seek out the leatherjacket larvae and on contact they enter the larvae and destroy it. Having destroyed the leatherjacket ,the nematodes multiply and are released back into the soil to hunt down more leatherjackets.

How is it sent?Nematodes are a perishable, living product, so it is sent out fresh by Royal Mail 1st class post. Being a perishable, living product, it must be used before the expiry date (which is marked on the inside of the pack and will be at least 2 weeks) and it must be stored in the fridge until it is needed. Once opened, the contents do not keep, so it must be used in one day – do NOT store the made up solution or powder.

N.B. Need a Coarse Rose, NemaCan Watering Can, EasyNem Applicator or Hose-end Feeder  – Add one to your basket and save £1.00 off a Coarse Rose OR save £2.00 off a EasyNem ApplicatorHose-end Feeder or NemaCan when bought with your nematodes (savings applied at the checkout).


  1. Ian Flockhart (verified owner)

    After losing an entire lawn to Leatherjackets in 2016, I started using the Nematode product twice a year. Since then my lawn has been untouched. This year I had an additional problem with large numbers of very large slugs. Once again Green Gardener provided the cure.

  2. Stuart (verified owner)

    Ordered Nemasys Leatherjacket Killer at a good price and delivered within 2 days, great service.

  3. Eleanor (verified owner)

    Didn’t really expect the product to work however it seems to have done the job. Have only seen one live leatherjacket since applying the product.

  4. Ian (verified owner)

    Was a bit late in ordering Nematodes but ‘Greengardener’ had them to me before you could say leatherjacket! Excellent service and price for ordered product, goodbye Cranefly, hello healthy lawn.

  5. Christopher (verified owner)

    Very good service yet again from green gardener, the Leather Jacket Nematodes easy to order, arrived on date, well packed and easy to use. This is an annual exercise for me, so far so good.

  6. Graham (verified owner)

    Prompt service in supplying nematodes to control leatherjackets. It’s proved very effective.

  7. Chris (verified owner)

    Excellent product, did the job. speedy delivery. I am very satisfied and pleased.

  8. Anonymous (verified owner)

    Bought leatherjacket nematodes again from Green Gardener. After postage charges, theirs are the cheapest and most reliable I found. Delivery is quick and efficient. Exactly what I ordered and arrived a little faster than expected.

  9. Ian (verified owner)

    I started using Nemasys Leather jacket treatment five years ago after losing an entire newly laid lawn to leatherjacket infestation. Absolutely zero problems since then. Deliveries are always prompt and instructions accompanying the product are very clear and easily understood.

  10. Philip (verified owner)

    Easy to order online and received order very quickly. Nematode treatment has worked!

  11. Anonymous (verified owner)

    Ordered nematodes to combat the leather jacket attack on our lawn, a two dose autumn treatment, one pack now and a second pack delivered a few weeks later. Received each packet in good time and good condition. Followed the clear and easy to understand instructions and we seem to now have a recovering lawn, it may take some time and a little re-seeding but hopefully the problem is resolved. Excellent service and pleasing result so far.

  12. Surendra Patel

    This is the first time I am ordering and will use for the first time

  13. Mrs N Dower

    Great stuff!

  14. Ian

    Hello Jon, I’m just emailing to let you know how pleased I am with the result of applying the nematodes (purchased from Green Gardener) last autumn. The change in my lawn has been remarkable. I’ve also put a black plastic sheet down in a few areas to see if any leatherjackets appear – and I’ve only spotted one (I think). A great result. Thanks again Ian

  15. Elaine (verified owner)

    I used this in Spring 2021 as I had moved into a new house with a heavy infestation, which I discovered on creating new borders where the young plants were being destroyed. I was delighted at the result and after using Nemasys Leatherjacket Killer my garden has been transformed and the lawn has recovered also. I will be placing an order soon to treat my garden in October. I’m very happy with the service provided by Green Gardener.

  16. AntonioCip

    Nemasys Leatherjacket Killer should be applied when the soil temperature is above 12oC 54oF and the leatherjackets are at the correct stage in their life cycle. This will be late August till the end of October. An easy way to judge the correct time is to apply two weeks after a large number of crane fly are seen.

    • Jon

      Thanks for the comment and we do recommend treating in Sept / Oct as you suggest, BUT if your lawn is under attack at other times of the year i.e. in the spring / summer, then you can still treat with Nemasys Leatherjacket Killer but you HAVE TO apply at double strength as the leatherjackets are more mature and much harder to kill. This is why it is available all year round.

  17. Edward Watson

    Have used this company several times and have always had excellent service. I have been buying Nemasys Leatherjacket Killer and the product has been working well. Also competitively priced.

  18. Anonymous (verified owner)

    Ordered the leatherjacket nematodes and they arrived quickly and worked – thanks!

  19. Darius Rishehri (verified owner)

    Very helpful and informative on leather jackets infestations well as prompt service. Highly recommend them, and good technical advice.

  20. Sally Yong (verified owner)

    We purchased the treatment as recommended for the time of year which we were going to apply the nematodes and after just one course of treatment it has cleared up our lawn. It did take some time for the grass to grow back but it has completely recovered. We are extremely pleased with the results and to keep the leather jackets away we have pre-ordered another course for late September just to clear out the lawn before winter. I think we will use this on a regular (twice a year) basis just to keep on top of it.

    Would thoroughly recommend Green Gardener for their services and excellent communication. The team are very flexible and I have been able to change the date of upcoming deliveries without any issues.

    Will always use this company for my garden treatments!

  21. Ellen (verified owner)

    The nematodes arrived quickly. Instructions clear and the parts of the lawn damaged by leather jackets are improving.

  22. Caroline Carter-Frost (verified owner)

    Seems to have done the job!

  23. Anonymous (verified owner)

    First class product.

  24. Anonymous (verified owner)

    Easy ordering and delivery. Works well killing leather jackets.

  25. Ian Lithgow (verified owner)

    Have been using this product since 2020 with excellent results, grass thickens and looks verdant. Delivery service most impressive, swift and goods arrive intact.”

  26. Anonymous (verified owner)

    Keen prices and an excellent range of products. I rang up for advice on leather jacket remover and as always the advice was very helpful, friendly and knowledgeable. Will always buy here.

  27. Ray Barr (verified owner)

    Daddy long legs are very few, so hopefully no leatherjackets, but nematodes very easy to use and looks like it was very successful. Thanks will use again.

  28. Anonymous (verified owner)

    Ordered nematodes for leatherjacket treatment. Efficiently processed and delivered as scheduled. Last year’s application proved very effective and expect it will be the same again this year.

  29. Derek Hoadley (verified owner)

    I have been so pleased with my purchase from you it did everything you advertised it would. Thank you Green Gardener. From A very satisfied customer.

  30. Anne Urban (verified owner)

    Excellent product as we have no holes in the lawn now from the foxes digging holes!

  31. Caroline

    My lawn has suffered during last year and I was sick of looking at bare patches and thatch and the birds were pecking it to death. I looked online to purchase something to counteract Crane Fly grubs as I was sure I had an infestation. I bought a treatment called Nemasys which I applied to the lawn. I found their after sale service at Green Gardener to be excellent. Very helpful indeed.

  32. Christopher Cotesworth (verified owner)


  33. Michael Richards (verified owner)

    Fantastic product, does the job and environmentally friendly. Green Gardener provide a first class service in every respect, and I would have no hesitation in recommending.

  34. Adrian Stone (verified owner)

    Bought nematodes to combat crane fly larvae that had destroyed our lawn. They arrived when needed, I had to put back a weenie two due to a cold March. They seem to have done the trick, along with reseeding as lawn now reappearing. Will use again and apply in autumn to make sure.

  35. Steve Troke (verified owner)

    Never thought I would get so excited about Blasted Chafer Grubs and Leatherjackets! The Mother in Laws Lawns have been devastated this year and completely at a loss at what to do. We contacted Green gardener and How initially helpful they were was a real eyeopener. Pure advice as to what to look for and then again how to treat ourselves. Not thinking things could get any better, I ordered our goods during the Easter break. 1st day after, I phoned just to see what the expected delivery date would be , so as to allow me to plan ahead. Again , really honest helpful, helpful answers. May be Wed or Thur. They also actually phoned back that same day to say goods had been shipped. Thee goods following morning and now My Work Begins. Finally, the way this Company has handled every aspect of our journey to Date, I have No Doubt the future is Bright. Here`s Hoping our little Army of Nematode`s will do their Magic. Thank you everyone at Green Gardener, especially the Lovely Lady taking our calls.

  36. Steven (verified owner)

    Very efficient

  37. Steven (verified owner)

    I got my delivery at the stated date

  38. Elizabeth Townsend (verified owner)

    It was a quick delivery and the product was fresh and in good condition.

  39. Andrew (verified owner)

    Very prompt delivery of the Nematodes and they’ve done their job so far.

  40. Trevor Marshall (verified owner)

    Ordered Nematodes for garden due to crane fly infestation. Excellent advice and quick delivery. After 2 weeks the hungry little tides are now eating the lava and the problem is quickly disappearing. I’ll be treating again in the early spring and won’t hesitate to buy from Green Gardener again.

  41. Alexander Roc (verified owner)

    Terrific service posting nematodes , and at a saving of 15% over competing gardening companies.

  42. Graham Hewitt (verified owner)

    I had a big problem with crane flies in 2021. The result was the lawn had many yellow patches where the grass roots had been eaten. I ordered nematodes from Green Gardener. The delivery was prompt and customer service excellent. I did the same in 2022 and the lawn greatly improved. This year the lawn is almost back to normal but I did another application, just in case. Thank you Green Gardener for the great advice, great product and great service.

  43. Ian Russell (verified owner)

    Great service again this year when supplying nematodes for autumn treatment. It is helpful to be able to schedule a future delivery date. Product arrived on time and nematodes were applied next day.

  44. Michael Richards (verified owner)

    Extremely efficient and informative organisation, good website and product received within a few days. I have been using these Nematodes for over 12 months, and this year the first I haven’t had chunks taken out of my lawns by the Magpies, therefore I can only conclude this product works.

  45. Anonymous (verified owner)

    Nematodes have done their job! Thanks for the speedy delivery and effective treatment for leatherjackets that were ruining our lawn.

  46. Alex Yates (verified owner)

    We’ve bought nematodes from Green Gardener for a few years now in order to control the leather jackets that were destroying our lawn. They work really well! The instructions are clear and easy to follow also. Thanks, Alex

  47. Joanne Lawrence (verified owner)

    Have used Green Gardener twice now, products have been sent out quickly and ordering online is very easy – very happy with the service. I also spoke to a very nice gentleman on the phone (Jon on 01394 420922) who gave me some advice – would use again and would recommend. Thank you!

  48. Nick Man (verified owner)

    The delivery was on time and we have used the nematodes but waiting to see if it has worked. Our poor lawn is nearly just mud and other bungalows in our close have the same problem and they have all used green gardener 👍

  49. Mark Sparks (verified owner)

    Great product for eliminating leather jackets. Swift delivery. Thank you.

  50. Julie Webb (verified owner)

    We were having problems with our lawn and contacted Jon at Green Gardener. Jon was very prompt in his response and identified the problem as leather jackets. Jon advised Nematodes and sent the appropriate link. We have now made two orders and the delivery time is very quick. We are most grateful to Jon for all his advice and knowledge.

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