PRO Supplier

John Jennings, Course Superintendent at Castleknock Golf Club in Dublin, always used to struggle with achieving longevity from the fertilizers he was using – that was until he applied ICL’s Sierrablen Plus Stress Control 15-5-22 +2MgO.

Located in the leafy suburbs of Dublin, Castleknock Golf Club is one of the finest parkland courses in the country. With its undulating greens, the course is designed to test golfers while maintaining that all important element of fairness. There are a number of memorable holes on the course, most notably the 9th and 18th, and two par 3’s over water that share a double green, with the clubhouse providing a stunning backdrop.

Tasked with keeping the course in impeccable condition is John Jennings. John started his career at Castlebar Golf Club before moving to the Grange Golf Club in 1984 – where he worked for 16 years.

In 1999 John accepted the position of Assistant Superintendent at Carton House where he worked under John Plummer. During this time he undertook the responsibility of the grow-in of the O’Meara and Montgomery Courses. He spent four years in this position before taking the role of Course Superintendent at Castleknock Golf Club in 2004 – which corresponded with the opening of the course.

Now a vibrant club with a growing membership which currently stands at approximately 900 members, Castleknock can see up to 40,000 rounds of golf a year played on the course. As you would expect, to cater for this high amount of usage the course is maintained to the highest standard.

Generally, John does not encounter too many issues, which is testament to his work, but he does admit to a slightly problematic area on his fairways.  

“I have used many controlled release fertilizers over the years and struggled to get longevity and colour due to the high sand content in my fairways. However, since I began using Sierrablen Plus fertilizers two years ago it has become a game changer.”

John is one of many turf managers who has benefited from using a range of products in the Sierrablen Plus portfolio. This is largely thanks to the Poly-S and PACE technologies which are contained within each analysis. They have been scientifically proven to provide consistent feeding, enhanced longevity and a low-scorch risk. Furthermore, its small-sized granules allow for even coverage and equal nutrient distribution. These fertilizer products offer a wide choice of analyses for proper nutrient input for every growth phase of the turf, and John has certainly noticed significant improvements since the product.

Featuring high potassium content to strengthen cell walls, John applied the analysis to his fairways in September 2017 and despite the incredibly harsh winter, it was still having a positive effect in March 2018. John was so impressed with the product that this year he applied Sierrablen Plus Stress Control to his tees and was pleased to see remarkable progression so soon – again in unfavourable weather conditions.

“I am extremely impressed with the early response and sward density achieved when using the product, giving uniform growth that lasts 6 – 7 months. I will continue to use it and would highly recommend it to anyone,” he said.

For further information, please contact ICL on 01473 237100 or visit www.icl-sf.co.uk or www.icl-sf.ie

Votes: 0
E-mail me when people leave their comments –

You need to be a member of Landscape Juice Network to add comments!

Join Landscape Juice Network

Open forum activity

Graham Taylor replied to Peter sellers's discussion New for old insurance
"Sadly, I'd say  most commercially used stuff isn't really worth anything after 4 years work. As you say, if they give you half the new value, you'll never find a satisfactory secondhand one for that money but will just have to put it towards the…"
12 hours ago
Peter sellers replied to Julian chambers's discussion Sick pay insurance
"We used to use Cirencester Friendly Society, the friendly societies tend to offer better terms. Premiums are based on financial benefit amd how many days delay after injury/sickness you choose before they payout. Make sure all medical history…"
20 hours ago
Julian chambers posted a discussion
Hi all. Hope everyone is getting off to a good start this season.Can anyone recommend a decent sick cover or work injury company. There's a lot out there so solid suggestions welcome pleaee 
yesterday
Richard Shelton replied to PGM's discussion Grass Cutting 2026 Season
"Most of our contracts run from 1st April, but the grass is ready to cut now. I've cut my personal lawns, but like other commenters on here, I cut in late November as well. Too wet from December and brought February though."
yesterday
Neil Darby replied to PGM's discussion Grass Cutting 2026 Season
"Done a few first cuts this week, my own lawn (or whart is left of it, last Sat.) Far too wet, even for the Stihl battery mower on one of the four lawns, for one client. Firm enough everywhere else. But the Moss....... everywhere I look there is…"
Saturday
PGM replied to PGM's discussion Grass Cutting 2026 Season
"Absolutely, we're the same for wet weather. Get the right tools and good waterproofs and just carry on. Have a great season "
Saturday
M Olsson replied to M Olsson's discussion Trailer and Rotavator for Sale
"If allowed, happy to share private email or phone number "
Saturday
M Olsson posted a discussion
Hi everyone,Firstly, my sincerest apologies if this is not allowed. I set up my self employed gardening business a couple of years ago, went really well but unfortunately developed Rhabdomylosis, and turns out I have a rare genetic condition. Now I…
Saturday
Dylan replied to PGM's discussion Grass Cutting 2026 Season
"Very true great machines but heavy and c. Easy damage lawns if the ground is on the soft side"
Saturday
Sam Bainbridge replied to PGM's discussion Grass Cutting 2026 Season
"Gonna make a start this week had a day off on Thursday check all is running and ready for action even the 30yr old honda started 2nd pull they don't make them like that anymore, picked the iseki up too so all set to go next week although forecast…"
Saturday
Peter sellers replied to Ian Stanton's discussion lawn repair soil
"Ian, we have bought some utter crap over the last 40 years in the trade. The words " screened" and to " British Standard" are meaningless and appear to cover up screened demolition waste mixed with green waste or just green waste.
For the amount you…"
Saturday
David Benson replied to Peter sellers's discussion New for old insurance
"I forgot to add your premiums will go up as you have had a claim "
Friday
David Benson replied to Peter sellers's discussion New for old insurance
"Peter, thats how it works with them and its on your purchace price not the current RRP and will want purchace receipt. as a exsample a £600 machine in 4 years time will be valued at £190 but the new price could have gon up £100 in the 4 years since…"
Friday
John F replied to Ian Stanton's discussion lawn repair soil
"I tend to buy whatever top soil the local nursery has on offer usually in 25 litre bags , screened where possible and check it's not damp .
Store it in a dry place before use .
Have had the bulk bags where it's more viable to purchase in bulk but…"
Friday
Marc Piechocki posted a discussion
Friday
Ian Stanton posted a discussion
Hello, I have a approx 110 square meter shady lawn that I need to repair.  It was turfed two years ago, I think fairly badly, and doesn't seem to have been watered through the summer.It is patchy with 70% green, 30% dead.The client is only renting,…
Friday
More…

Trailer and Rotavator for Sale

Hi everyone,Firstly, my sincerest apologies if this is not allowed. I set up my self employed gardening business a couple of years ago, went really well but unfortunately developed Rhabdomylosis, and turns out I have a rare genetic condition. Now I…

Read more…
1 Reply · Reply by M Olsson on Saturday
Views: 70

lawn repair soil

Hello, I have a approx 110 square meter shady lawn that I need to repair.  It was turfed two years ago, I think fairly badly, and doesn't seem to have been watered through the summer.It is patchy with 70% green, 30% dead.The client is only renting,…

Read more…
2 Replies · Reply by Peter sellers on Saturday
Views: 144